WO2010084812A1 - 冶金用粉末の製造方法、圧粉磁心の製造方法、圧粉磁心およびコイル部品 - Google Patents
冶金用粉末の製造方法、圧粉磁心の製造方法、圧粉磁心およびコイル部品 Download PDFInfo
- Publication number
- WO2010084812A1 WO2010084812A1 PCT/JP2010/050320 JP2010050320W WO2010084812A1 WO 2010084812 A1 WO2010084812 A1 WO 2010084812A1 JP 2010050320 W JP2010050320 W JP 2010050320W WO 2010084812 A1 WO2010084812 A1 WO 2010084812A1
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- Prior art keywords
- particles
- iron
- binder
- powder
- metallurgical powder
- Prior art date
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- 239000011248 coating agent Substances 0.000 claims abstract description 46
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 195
- 229910052742 iron Inorganic materials 0.000 claims description 91
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- 229910019142 PO4 Inorganic materials 0.000 description 6
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- 239000010703 silicon Substances 0.000 description 6
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- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium(II) oxide Chemical compound [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 6
- 229910017082 Fe-Si Inorganic materials 0.000 description 5
- 229910017133 Fe—Si Inorganic materials 0.000 description 5
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- 239000006249 magnetic particle Substances 0.000 description 5
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- 239000010936 titanium Substances 0.000 description 5
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- 239000011777 magnesium Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
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- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
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- 238000003756 stirring Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 238000005272 metallurgy Methods 0.000 description 3
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910052727 yttrium Inorganic materials 0.000 description 3
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- 238000007088 Archimedes method Methods 0.000 description 2
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
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- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
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- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
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- 229910052725 zinc Inorganic materials 0.000 description 2
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- ODIGIKRIUKFKHP-UHFFFAOYSA-N (n-propan-2-yloxycarbonylanilino) acetate Chemical compound CC(C)OC(=O)N(OC(C)=O)C1=CC=CC=C1 ODIGIKRIUKFKHP-UHFFFAOYSA-N 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
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- 150000002505 iron Chemical class 0.000 description 1
- 229910000398 iron phosphate Inorganic materials 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
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- 239000000155 melt Substances 0.000 description 1
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- 229910052914 metal silicate Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- LAQFLZHBVPULPL-UHFFFAOYSA-N methyl(phenyl)silicon Chemical compound C[Si]C1=CC=CC=C1 LAQFLZHBVPULPL-UHFFFAOYSA-N 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
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- 229920001187 thermosetting polymer Polymers 0.000 description 1
- RFXWSSKJUYFOBO-UHFFFAOYSA-N tricyanatosilyl cyanate Chemical compound N#CO[Si](OC#N)(OC#N)OC#N RFXWSSKJUYFOBO-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/102—Metallic powder coated with organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/16—Metallic particles coated with a non-metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/10—Formation of a green body
- B22F10/14—Formation of a green body by jetting of binder onto a bed of metal powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
- B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14708—Fe-Ni based alloys
- H01F1/14733—Fe-Ni based alloys in the form of particles
- H01F1/14741—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together
- H01F1/1475—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together the particles being insulated
- H01F1/14758—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together the particles being insulated by macromolecular organic substances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
- H01F1/26—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/08—Cores, Yokes, or armatures made from powder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Definitions
- the present invention relates to a metallurgical powder manufacturing method, a dust core manufacturing method, a dust core, and a coil component.
- a powder magnetic core is used in an electric device having a solenoid valve, a motor, an electric circuit, and the like.
- the dust core is composed of a plurality of composite magnetic particles, and each of the plurality of composite magnetic particles has, for example, iron-based particles made of pure iron and an insulating film covering the surface thereof.
- the dust core is required to have a magnetic characteristic that can obtain a large magnetic flux density by applying a small magnetic field and a magnetic characteristic that can react sensitively to an external magnetic field.
- the particle size of the iron-based particles is small, the fluidity is deteriorated. If the fluidity is poor, the filling properties when filling the mold with the composite magnetic particles are poor. For this reason, the density of the compact formed by pressure-molding the composite magnetic particles is generally low.
- Patent Document 1 discloses that the particle size distribution of Fe—Si based metal magnetic powder is 50% cumulative with the object of having good DC superposition characteristics with low iron loss even in a high frequency region.
- Patent Document 1 describes that powders of two particle size bands of A and B are mixed and a silicon resin is added and mixed as a binder resin in a state to obtain a sized mixed powder.
- the fine particles (A) having a relatively small particle size aggregate and the coarse particles (B) having a relatively large particle size are aggregated.
- the fine particles are aggregated, there arises a problem that the improvement of the density of the compact formed by press-molding the composite magnetic particles is hindered.
- the coarse particles are adjacent to each other, so that the apparent particle size is increased, which causes a problem that eddy current loss increases.
- an object of the present invention is to provide a metallurgical powder manufacturing method, a powder magnetic core manufacturing method, a powder magnetic core, and a coil component that improve density and suppress increase in eddy current loss.
- the method for producing metallurgical powder of the present invention includes a step of coating a surface of a plurality of first particles with a first binder, and a surface of the first binder based on a particle size of the first particles. And a step of coating a plurality of second particles having a small particle size.
- the surface of the first particle having a relatively large particle size is coated with the first binder, and the surface of the first binder is relatively disposed.
- the second particles having a small particle size are coated. For this reason, it can suppress that 2nd particle
- a plurality of second particles having a particle size equal to or smaller than 1/5 times the particle size of the first particles are used.
- the metallurgical powder production method further includes a step of introducing a second binder during the step of coating the second particles or after the step of coating the second particles. Yes.
- the characteristic of the metallurgical powder to manufacture can be adjusted.
- the first iron-based particles and a first insulating film surrounding the surface of the first iron-based particles are included.
- the second particles having the second iron-based particles and the second insulating coating surrounding the surface of the second iron-based particles are used.
- the first and second particles can electrically insulate other particles. For this reason, when this metallurgical powder is pressure-molded, a molded body having a large electric resistance can be formed.
- the method for producing a dust core according to the present invention comprises a step of producing a metallurgical powder by the above-mentioned method of producing a metallurgical powder and a step of pressure-molding the metallurgical powder.
- the dust core of the present invention is manufactured by the above-described method for manufacturing a dust core. Thereby, the powder magnetic core which can improve a density and can suppress increase in eddy current loss is realizable.
- the coil component of the present invention includes the above-described dust core. Thereby, the coil component which can improve a density and can suppress an increase in eddy current loss is realizable.
- the density can be improved and the increase in eddy current loss can be suppressed.
- the metallurgical powder in one embodiment of the present invention will be described.
- the metallurgical powder in the present embodiment includes first particles 10, second particles 20, a first binder 30, and a second binder 40.
- the first binder 30 covers the surface of the first particle 10.
- the second particles 20 cover the surface of the first binder 30.
- the second binder 40 covers the surfaces of the second particles 20 and is present in the gaps of the metallurgical powder.
- the particle size of the first particle 10 is preferably larger than the particle size of the second particle 20 and is not less than 5 times the particle size of the second particle 20.
- the particle size of the first and second particles 10 and 20 means an average particle size, and in the particle size histogram, the sum of masses from the smaller particle size reaches 50% of the total mass.
- the particle size of the particles that is, 50% particle size.
- the first and second particles 10 and 20 include iron-based particles.
- the iron-based particles include iron (Fe), iron (Fe) -silicon (Si) alloy, iron (Fe) -aluminum (Al) alloy, iron (Fe) -nitrogen (N) alloy, iron ( Fe) -nickel (Ni) alloy, iron (Fe) -carbon (C) alloy, iron (Fe) -boron (B) alloy, iron (Fe) -cobalt (Co) alloy, iron (Fe) -Phosphorus (P) alloy, iron (Fe) -nickel (Ni) -cobalt (Co) alloy, iron (Fe) -aluminum (Al) -silicon (Si) alloy, and the like.
- the first and second particles 10 and 20 may be a single metal or an alloy.
- the first and second particles 10 and 20 may be the same material or different materials.
- the first binder 30 binds the first particles 10 and the second particles 20.
- the 1st binder 30 may surround the perimeter of the surface of the 1st particle
- the second particles 20 may surround the entire circumference of the surface of the first binder 30 (not shown), or may surround a part of the surface of the first binder 30. Good.
- first and second binders 30 and 40 for example, a thermoplastic resin, a thermosetting resin, or the like can be used.
- a thermoplastic resin for example, polyimide, polyphenylene sulfide, polyether ketone, silicone resins, silsesquioxanes, titanium-oxygen monomer, titanium-oxygen oligomer, Silicon-oxygen monomers and silicon-oxygen oligomers can be used. Since these substances have high strength, the strength of the molded body can be further improved.
- silicone resins dimethyl silicone and methylphenyl silicone can be preferably used, and as silsesquioxanes, oxetane silsesquioxane, vinyl hydroxysilsesquioxane and the like can be preferably used.
- Titanium-oxygen monomers include titanium alkoxide, titanium chelate, and titanium acylate
- titanium-oxygen oligomers are polymers obtained by oligomer treatment of the above monomers
- silicon-oxygen monomers include silicon alkoxide, silicon cyanate, silicon
- a polymer obtained by oligomer-treating the above monomer can be preferably used.
- the first and second binders 30 and 40 may be the same material or different materials.
- the metallurgical powder in the present embodiment may consist of only the first particles 10 and the second particles 20, or may further include powder such as copper powder.
- the metallurgical powder in the present embodiment includes iron-based particles, the metallurgical powder may include particles other than iron-based particles.
- the manufacturing method of the metallurgical powder in this Embodiment is demonstrated.
- the first binder 30 is coated on the surfaces of the plurality of first particles 10 (step S1).
- the first particles 10 including iron-based particles are used.
- iron-based particles made of the materials described above are prepared.
- the method for producing the iron-based particles is not particularly limited, and for example, a gas atomizing method, a water atomizing method, or the like can be applied. Thereafter, the iron-based particles are heat-treated. Inside the iron-based particles before the heat treatment, there are a large number of defects such as strains and crystal grain boundaries due to thermal stresses during the atomizing process. Therefore, these defects can be reduced by heat-treating the iron-based particles. This heat treatment may be omitted. Thereby, the first particles 10 are prepared.
- the particle diameter of the first particle 10 is, for example, not less than 50 ⁇ m and not more than 70 ⁇ m.
- the particle size of the first particles 10 is 50 ⁇ m or more, it is possible to suppress an increase in coercive force and hysteresis loss of a dust core produced using metallurgical powder.
- the thickness is 70 ⁇ m or less, eddy current loss that occurs in a high-frequency region of 1 kHz or more can be effectively reduced.
- the first binder 30 made of the material as described above is prepared. And the some 1st particle
- the first binder 30 is solidified while remaining attached to the surfaces of the plurality of first particles 10.
- the first binder 30 can be coated on the surfaces of the plurality of first particles 10.
- the first binder 30 only needs to cover a part of the surface of the first particle 10.
- the first binder 30 After the temperature in the mixing container is raised in advance to the melting temperature, the plurality of first particles 10 and the first binder 30 may be added to the mixing container and mixing may be started.
- the mixing method is not particularly limited, and any of a mixer such as a V-type mixer, a vertical rolling mixer, a vibration ball mill, a planetary ball mill, etc. can be used. It may be simply mixed at room temperature, or may be coated with the lubricant in a liquefied state by increasing the temperature and stabilized by cooling.
- a mixer such as a V-type mixer, a vertical rolling mixer, a vibration ball mill, a planetary ball mill, etc.
- It may be simply mixed at room temperature, or may be coated with the lubricant in a liquefied state by increasing the temperature and stabilized by cooling.
- the surface of the first binder 30 is coated with a plurality of second particles 20 having a particle size smaller than that of the first particles 10 (step S2).
- this step S ⁇ b> 2 it is preferable to use a plurality of second particles 20 having a particle size equal to or less than 1/5 times the particle size of the first particles 10.
- the effects of the first particles 10 that are coarse particles and the effects of the second particles that are fine particles are expressed more. Can do.
- the second particles 20 are prepared in the same manner as the first particles 10.
- second particles 20 containing iron-based particles are used.
- the second particle 20 is prepared basically in the same manner as the first particle 10 except that the second particle 20 has a particle size smaller than that of the first particle 10.
- the plurality of second particles 20 and the plurality of first particles 10 covered with the first binder 30 are mixed using a stirring mixer. Thereby, the second particles 20 can be coated on the surface of the first binder 30. As described above, the second particles 20 only need to cover a part of the surface of the first binder 30.
- the average particle diameter of the second particles 20 is, for example, not less than 10 ⁇ m and less than 50 ⁇ m.
- the coating area for the first particles 10 does not become excessive, and thus the aggregation of the second particles 20 in the metallurgical powder can be prevented and produced.
- the decrease in the density of the dust core can be suppressed.
- the thickness is less than 50 ⁇ m, the particle size difference between the first particles 10 and the second particles 20 in the metallurgical powder is not reduced, and a decrease in density of the produced dust core can be suppressed.
- first particles 10 and the second particles 20 are mixed so that the mass ratio of the second particles 20 to the first particles 10 is 1 or more and 7/3 or less.
- step S3 the 2nd binder 40 is thrown in (step S3).
- This step S3 You may perform either in step S2 which coat
- the second binder 40 made of the material as described above is prepared.
- the second binder 40 are mixed.
- the mixed second binder 40 and powder are put into a thermostatic bath and heated.
- the second binder 40 can be melted and adhered to the surface of the second iron-based particles 21.
- the second binder 40 can adhere to the surface of the second particle 20, the gap between the first and second particles 10, 20 and the like.
- This step S3 may be omitted.
- the metallurgical powder shown in FIG. 1 can be manufactured by performing steps S1 to S3 described above. Further, a lubricant or the like may be further mixed.
- the surface of the first particle 10 (coarse particle) having a relatively large particle diameter is coated with a first binder 30 (step S1), and the first binder 30
- the surface is coated with second particles 20 (fine particles) having a relatively small particle size (step S2).
- step S1 the surface of the first particle 10 (coarse particle) having a relatively large particle diameter
- step S2 the first binder 30
- step S2 the second particles 20 (fine particles) having a relatively small particle size
- it can suppress that the 2nd particle 20 adheres to the surface of the 1st particle 10, and the 2nd particles 20 aggregate. That is, aggregation of the first particles 10 can be suppressed, and aggregation of the second particles 20 can be suppressed. Since the fluidity can be improved by suppressing the aggregation of the second particles 20, the density of the compact formed by pressure molding can be improved.
- the first particle 10 having a relatively large particle size, the second particle 20 having a relatively small particle size, The binder 30 is mixed.
- the first particles 10 are aggregated and the second particles 20 are aggregated.
- the first particles 10 are aggregated, eddy current loss increases.
- the second particles 20 are aggregated, the fluidity is deteriorated, and a gap is generated between the first particles 10 in a state where the first particles 10 are aggregated. For this reason, the density of the molded object formed by pressure molding will fall.
- step S1 in which the surfaces of the plurality of first particles 10 are coated with the first binder 30 and particles smaller than the particle diameter of the first particles 10 on the surface of the first binder 30.
- step S2 for coating the plurality of second particles 20 having a diameter, the density can be improved and an increase in eddy current loss can be suppressed.
- the homogeneity inside the compact formed by pressure-molding the metallurgical powder in the present embodiment can be improved, there are portions where the magnetic flux easily passes and portions where the magnetic flux hardly passes (portions where the fine particles are aggregated). This can be suppressed. For this reason, the fall of a magnetic permeability can be suppressed and deterioration of a superimposition characteristic can be suppressed.
- the metallurgical powder in the present embodiment shown in FIG. 4 basically has the same configuration as the metallurgical powder in the first embodiment shown in FIG. 1, but the first and second particles 10 and 20 are the same. Are different in that they include first and second iron-based particles 11 and 21 and first and second insulating coatings 12 and 22 surrounding the surfaces of the first and second iron-based particles 11 and 21, respectively. ing.
- the average particle diameter of the first iron-based particles 11 is 30 ⁇ m or more and 500 ⁇ m or less. In this case, the coercive force when pressure molding can be reduced. By setting the average particle size to 500 ⁇ m or less, eddy current loss can be reduced.
- the first and second insulating coatings 12 and 22 function as an insulating layer between the first and second iron-based particles 11 and 21.
- the electrical resistivity ⁇ of the dust core obtained by pressure-molding this metallurgical powder is increased. be able to. Thereby, it can suppress that an eddy current flows between the 1st and 2nd iron base particles 11 and 21, and can reduce the eddy current loss of a powder magnetic core.
- the average film thickness of the first and second insulating coatings 12 and 22 is preferably 10 nm or more and 1 ⁇ m or less. By setting the average film thickness of the first and second insulating coatings 12 and 22 to 10 nm or more, eddy current loss can be effectively suppressed. By setting the average film thickness of the first and second insulating coatings 12 and 22 to 1 ⁇ m or less, it is possible to prevent the first and second insulating coatings 12 and 22 from being sheared during pressure molding. In addition, since the ratio of the first and second insulating coatings 12 and 22 in the metallurgical powder does not become too large, the magnetic flux density of the powder magnetic core obtained by pressing the metallurgical powder is significantly reduced. Can be prevented.
- the average film thickness is determined by composition analysis (TEM-EDX: transmission-electron-microscope-energy-dispersive-X-ray-spectroscopy) and inductively-coupled-plasma-mass-spectrometry (ICP-MS). Considering the amount of element to be obtained, the equivalent thickness is derived, and further, the film is directly observed by a TEM photograph, and it is determined by confirming that the order of the equivalent thickness derived earlier is an appropriate value. Means something.
- the first and second insulating coatings 12 and 22 are preferably made of at least one substance selected from the group consisting of phosphate compounds, silicon compounds, zirconium compounds, and boron compounds. Since these materials are excellent in insulation, eddy currents flowing between the first and second iron-based particles 11 and 21 can be effectively suppressed. Specifically, it is preferably made of silicon oxide or zirconium oxide. In particular, by using a metal oxide containing phosphate for the first and second insulating coatings 12 and 22, the coating layer covering the surfaces of the first and second iron-based particles 11 and 21 is made thinner. be able to. Thereby, the magnetic flux density of the 1st and 2nd particle
- the first and second insulating coatings 12 and 22 are made of Fe, Al, Ti (titanium), Ca (calcium), Mn, Zn (zinc), Mg (magnesium), V (vanadium), Cr, as metals.
- first and second insulating coatings 12 and 22 are made of an amorphous phosphate of at least one substance selected from the group consisting of Al, Si, Mg, Y, Ca, Zr (zirconium), and Fe. And an amorphous compound of a borate of the substance.
- first and second insulating coatings 12 and 22 may be made of an amorphous compound of an oxide of at least one substance selected from the group consisting of Si, Mg, Y, Ca, and Zr. .
- first and second particles 10 and 20 constituting the metallurgical powder are constituted by a single layer of insulating coating.
- the particles 10 and 20 may be composed of a plurality of layers of insulating coatings.
- the method for producing metallurgical powder in the present embodiment basically has the same configuration as the method for producing metallurgical powder in the first embodiment.
- step S ⁇ b> 1 for covering the first binder 30 the first iron base particles 11 and the first insulating coating 12 surrounding the surface of the first iron base particles 11 are provided.
- step S ⁇ b> 2 in which the second particles 20 are coated using the first particles 10, the second iron-based particles 21 and the second insulating coating 22 that surrounds the surface of the second iron-based particles 21 are included.
- the second embodiment is different from the first embodiment in that the second particles 20 are used.
- step S ⁇ b> 1 for coating the first binder 30 first, the first iron-based particles 11 are prepared as in the first embodiment.
- the first iron-based particles 11 may be subjected to heat treatment.
- the first insulating coating 12 is coated on the surface of the first iron-based particles 11.
- the first insulating coating 12 can be formed, for example, by subjecting the first iron-based particles 11 to a phosphate chemical conversion treatment.
- the sol-gel process using a solvent spraying and a precursor other than a phosphate chemical conversion process can also be utilized.
- the 1st insulating film 12 which consists of a silicon type organic compound.
- the first insulating coating 12 can be formed by wet coating using an organic solvent, direct coating using a mixer, or the like. Thereby, the several 1st particle
- step S ⁇ b> 2 for coating the second particles 20 first, the second iron-based particles 21 are prepared as in the first embodiment.
- the second iron-based particles 21 may be heat treated.
- the second insulating coating 22 is coated on the surfaces of the second iron-based particles 21 in the same manner as the method of coating the first insulating coating 12. Thereby, a plurality of second particles 20 in which the surface of each of the plurality of second iron-based particles 21 is coated with the second insulating coating 22 are obtained.
- the first and second iron-based particles 11 and 21 are formed.
- the first layer is made of at least one substance selected from the group consisting of an amorphous phosphate compound, an amorphous borate compound, an amorphous silicate compound, and an amorphous oxide.
- the second layer is made of at least one substance selected from the group consisting of a silicone resin and a metal oxide.
- step S1 for coating the first binder 30 the first iron base particles 11 and the first iron base particles.
- step S ⁇ b> 2 that covers the second particles 20 using the first particles 10 having the first insulating coating 12 that surrounds the surface of 11, the second iron-based particles 21 and the second iron-based particles 21. 2nd particle
- the first and second insulating coatings 12 and 22 can electrically insulate the first and second particles 10 and 20 from each other between the first and second iron-based particles 11 and 21. For this reason, when the manufactured metallurgical powder is pressure-molded, it is possible to improve the density, suppress an increase in eddy current loss, and realize a dust core having a large electric resistance. Therefore, the metallurgical powder in the present embodiment can be suitably used as a material for a dust core generally used such as a motor core, a solenoid valve, a reactor, or an electromagnetic component.
- the dust core in the present embodiment will be described.
- the powder magnetic core in the present embodiment is formed by pressure-molding the metallurgical powder in the second embodiment.
- the dust core includes first particles 10, second particles 20, and an insulator 50.
- the first and second iron-based particles 11, 21 and the first and second insulating coatings 12 that cover the surfaces of the first and second iron-based particles 11, 21 are provided.
- 22 and the first and second particles 10, 20 are joined by an insulator 50, or joined by engagement of irregularities of the first and second particles 10, 20.
- the insulator 50 is obtained by changing or remaining the first and second binders 30 and 40 contained in the metallurgical powder during the heat treatment.
- the metallurgical powder in the second embodiment is manufactured (steps S1 to S3).
- the metallurgical powder is subjected to pressure molding (compression molding) to form a compact (step S11).
- a feeder (not shown) is positioned above a space 74 surrounded by an inner wall 73, and the metallurgy manufactured in the second embodiment is directed from the feeder toward the space 74.
- Powder 15 is supplied.
- the bridge between the powders is eliminated, so that the density can be improved more easily.
- the upper punch 80 is positioned above the space 74.
- the upper punch 80 is moved downward, and for example, the metallurgical powder 15 is pressure-molded at a pressure of 300 MPa to 1500 MPa.
- the atmosphere for pressure molding is preferably an inert gas atmosphere or a reduced pressure atmosphere. In this case, it is possible to suppress oxidation of the metallurgical powder by oxygen in the atmosphere.
- the molded body 16 obtained by pressure molding is extracted from the space 74.
- the molded body 16 thus obtained has the first and second iron-based particles 11 and 21 and the first and second insulating coatings surrounding the surfaces of the first and second iron-based particles 11 and 21.
- a plurality of first and second particles 10 and 20 composed of 12 and 22 are provided.
- step S3 the case where the die 72 is heated and the metallurgical powder is pressure formed (hot working) is shown, but the present invention is not particularly limited thereto.
- the metallurgical powder may be pressure-formed (cold working) without heating the die.
- the die temperature maximum temperature rises to about 50 ° C.
- step S12 the molded body is heat-treated. This step S12 may be omitted.
- the molded body 16 is heat-treated in the air atmosphere at a temperature higher than the decomposition temperature of the first and second binders 30 and 40 and lower than the decomposition temperature of the first and second insulating coatings 12 and 22.
- a temperature range is 400 degreeC or more and 700 degrees C or less, for example.
- the first and second binders 30 and 40 are made of at least one substance selected from the group consisting of polyimides, polyphenylene sulfides, polyether ketones, silicone resins, and silsesquioxanes. In this case, when the heat treatment step S12 is performed, the remaining first and second binders 30 and 40 are not transformed, and the first and second insulating coatings 12 and 22 are protected.
- the first and second binders 30 and 40 are made of at least one substance selected from the group consisting of titanium-oxygen monomers, titanium-oxygen oligomers, silicon-oxygen monomers, and silicon-oxygen oligomers. In this case, when the heat treatment step S12 is performed, the remaining first and second binders 30 and 40 are transformed and remain as oxides, and the first and second insulating coatings 12 and 22 are protected.
- the dust core is completed by subjecting the molded body 16 to appropriate processing such as extrusion and cutting.
- the dust core manufactured in this way can be used as a coil component, for example, electronic components such as choke coils, switching power supply elements and magnetic heads, various motor components, solenoids, various magnetic sensors, and various electromagnetic valves. it can.
- the metallurgical powder in the second embodiment is used, but the metallurgical powder in the first embodiment may be used.
- the first and second iron-based particles 11 and 21 are insulated by heat treatment of the first and second binders 30 and 40, a dust core is obtained. .
- the method for manufacturing a powder magnetic core includes steps S1 to S3 for manufacturing metallurgical powder by the metallurgical powder manufacturing method, and step S11 for pressing metallurgical powder. It has.
- step S1 for coating the surface of the plurality of first particles 10 with the first binder 30 and the surface of the first binder 30 on the surface of the first particles 10 are larger than the particle size of the first particles 10.
- step S2 for coating a plurality of second particles 20 having a small particle size was examined.
- Atomized Fe—Si alloy powder was prepared.
- the first iron-based particles 11 contained 5.0% by mass of Si, the balance was made of Fe and inevitable impurities (Fe—Si based alloy), and had a particle size of 50 ⁇ m.
- the first insulating coating was amorphous iron phosphate.
- the powder deformability (ultimate elongation) of the first particles 10 was 0%.
- a first binder 30 was prepared by dissolving 0.5% by mass of a highly adhesive silicone resin (TSR1516 manufactured by Momentive) with a xylene solvent with respect to the weight of the first iron-based particles 11. Then, the first binder 30 and the first iron-based particles 11 were mixed. By volatilizing xylene while stirring, the surface of the first iron-based particles 11 was coated with the first binder 30 (step S1). The obtained first iron-based particles 11 may be used as they are, but when the binder coated with the ethanol solvent is dissolved, it may be cured by an appropriate heat treatment.
- TSR1516 highly adhesive silicone resin manufactured by Momentive
- the second particle 20 including the second iron-based particle 21 and the second insulating coating 22 covering the surface of the second iron-based particle 21 an atomized Fe—Si manufactured by Epson Atmix Co., Ltd. is used. Alloy powder was prepared.
- the second iron-based particles 21 had the same composition as the first particles 10 and had a particle size of 10 ⁇ m.
- step S2 the second iron-based particles 21 were mixed so as to have a mass ratio of 7/3 with respect to the first iron-based particles 11 (step S2).
- step S3 a binder in which PVB resin (polyvinyl butyral # 3000 manufactured by Denki Kagaku Kogyo Co., Ltd.) was dissolved in an ethanol solvent was also added (step S3).
- PVB resin polyvinyl butyral # 3000 manufactured by Denki Kagaku Kogyo Co., Ltd.
- Invention Example 2 The method for producing the metallurgical powder of Invention Example 2 was basically the same as that of Invention Example 1, but the first and second iron-based particles 11 and 21 contained 6.5% by mass of Si. The balance was different in that the balance was made of Fe and inevitable impurities (Fe—Si alloy).
- Invention Example 3 The method for producing metallurgical powder of Invention Example 3 was basically the same as that of Invention Example 2, except that the first and second iron-based particles 11 and 21 were composed of 9.5% by mass of Si. The difference was that it contained 5.5% by mass of Al and the balance was made of Fe and inevitable impurities (Fe—Si—Al alloy).
- Comparative Examples 1, 4, 7 The methods for producing metallurgical powders of Comparative Examples 1, 4, and 7 were basically the same as those of Invention Examples 1 to 3, respectively, but differed in that they did not contain the second particles.
- first particles (coarse particles having a particle diameter of 50 ⁇ m) of Invention Examples 1 to 3 were prepared.
- 0.5% by mass of a highly adhesive silicone resin (TSR1516 manufactured by Momentive) and 0.5% by mass PVB resin (polyvinyl butyral # 3000 manufactured by Denki Kagaku Kogyo Co., Ltd.) were dissolved in a xylene solvent.
- TSR1516 highly adhesive silicone resin
- PVB resin polyvinyl butyral # 3000 manufactured by Denki Kagaku Kogyo Co., Ltd.
- Comparative Examples 2, 5, 8 The methods for producing metallurgical powders of Comparative Examples 2, 5, and 8 were basically the same as those of Invention Examples 1 to 3, but differed in that they did not contain the first particles.
- Second particles of Comparative Examples 2, 5, and 8 second particles (fine particles having a particle diameter of 10 ⁇ m) of Invention Examples 1 to 3 were prepared.
- a highly adhesive silicone resin TSR1516 manufactured by Momentive
- PVB resin polyvinyl butyral # 3000 manufactured by Denki Kagaku Kogyo Co., Ltd.
- a dressing was prepared. Thereafter, the binder and the second particles were mixed.
- Comparative Examples 3, 6, 9 The methods for producing metallurgical powders of Comparative Examples 3, 6, and 9 were basically the same as those of Examples 1 to 3 of the present invention, respectively. However, the first and second particles were mixed together at the same time. It was different in that the agent was further mixed.
- the first and second particles of Invention Examples 1 to 3 were prepared as the first and second particles of Comparative Examples 3, 6, and 9. Further, 0.5% by mass of a highly adhesive silicone resin (TSR1516 manufactured by Momentive) and 0.5% by mass PVB resin (polyvinyl butyral # 3000 manufactured by Denki Kagaku Kogyo Co., Ltd.) were dissolved in a xylene solvent. A dressing was prepared. Next, the first particles and the second particles were mixed so that the mass ratio was 7/3 with respect to the first particles, and the prepared binder was further mixed.
- TSR1516 highly adhesive silicone resin
- PVB resin polyvinyl butyral # 3000 manufactured by Denki Kagaku Kogyo Co., Ltd.
- metallurgical powders of Comparative Examples 3, 6, and 9 were produced.
- the metallurgical powders of Comparative Examples 3, 6, and 9 were in the state shown in FIG.
- the density of the molded body was measured by the Archimedes method. The larger the value of the compact density, the better.
- the relative density was calculated by dividing the Archimedes method measurement value by the density measurement value of the melt of the same composition. The larger the relative density value, the better.
- the produced compact was subjected to winding of primary 150 turns and secondary turns 20, and hysteresis loss, eddy current loss, and iron loss were measured using an AC-BH tracer.
- the hysteresis loss and the eddy current loss were separated by fitting the frequency curve of the iron loss by the following three formulas using the least square method, and calculating the hysteresis loss coefficient and the eddy current loss coefficient.
- the magnetic flux density was measured by using a DC-BH curve tracer and measuring the magnetic flux density B100 of the compact when a magnetic field of 12000 A / m was applied. The larger the value of the magnetic flux density, the better.
- the magnetic permeability was measured by measuring the magnetic permeability ⁇ A at this frequency by applying an AC magnetic field at a frequency of 50 kHz to the produced molded body at room temperature. The larger the value of the magnetic permeability ⁇ A, the better.
- the DC bias permeability was measured by applying an alternating magnetic field at a frequency of 50 kHz to the produced molded body at room temperature and measuring the permeability ⁇ B at this frequency.
- the DC bias permeability ⁇ B is preferably as large as possible.
- the reduction rate of the DC bias permeability was calculated from the formula ( ⁇ B ⁇ A) / ⁇ A. The smaller the value of the decrease rate of the DC bias permeability, the better the change.
- Example 1 of the present invention using Fe-5.0Si as the first and second iron-based particles constituting the first and second particles was compared with Comparative Examples 1 to 3.
- Inventive Example 1 has the highest molded body density and relative density than Comparative Examples 1 to 3, and Inventive Example 1 is higher than Comparative Example 2 having only fine particles, but only coarse particles.
- the eddy current loss was lower than Comparative Example 2 and Comparative Example 3 in which fine particles and coarse particles were mixed.
- the present invention example 2 using Fe-6.5Si as the first and second iron-based particles constituting the first and second particles is compared with the comparative examples 4 to 6, the present invention example 2 has higher compact density and relative density than Comparative Examples 4 to 6, and Inventive Example 1 is higher than Comparative Example 5 having only fine particles, but Comparative Example 4 having only coarse particles, and fine particles The eddy current loss was lower than that of Comparative Example 6 in which the slag and coarse particles were mixed.
- Example 3 of the present invention using Fe-9.5Si-5.5Al as the first and second iron-based particles constituting the first and second particles was compared with Comparative Examples 7-9, Inventive Example 3 has the highest molded body density and relative density as compared with Comparative Examples 7 to 9, and Inventive Example 1 is higher than Comparative Example 8 with only fine particles, but with only coarse particles. The eddy current loss was lower than in Example 7 and Comparative Example 9 in which fine particles and coarse particles were mixed.
- Examples 1 to 3 of the present invention were able to maintain a low eddy current loss, so that a low iron loss could be maintained.
- the inventive examples 1 to 3 can improve the magnetic flux density, maintain a high magnetic permeability, and improve the DC bias magnetic permeability as compared with the comparative examples 1 to 3, 4 to 6, and 7 to 9, respectively.
- the reduction rate of the DC bias permeability could be reduced.
- the step S1 of coating the surfaces of the plurality of first particles 10 with the first binder 30 and the first particles 10 on the surface of the first binder 30 are performed.
- Step S2 for coating a plurality of second particles 20 having a particle size smaller than the particle size of the first and second particles the density of the molded body is reduced when the materials of the first and second particles are the same. It was confirmed that it was possible to improve and maintain low eddy current loss.
- step S1 which coat
- step S2 for coating the plurality of second particles 20 having metallurgy, and when the materials of the first and second particles are the same, a metallurgy capable of producing a compact having various high characteristics It was confirmed that the powder for use could be produced.
- first particles 11 first iron-based particles, 12 first insulating coating, 15 metallurgical powder, 16 molded body, 20 second particles, 21 second iron-based particles, 22 second insulating coating 30, 4030 binder, 50 insulator, 72 die, 73 inner wall, 74 space, 80 upper punch.
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Abstract
Description
このため、この冶金用粉末を加圧成形すると、電気抵抗が大きい成形体を形成することができる。
図1を参照して、本発明の一実施の形態における冶金用粉末について説明する。本実施の形態における冶金用粉末は、図1に示すように、第1の粒子10と、第2の粒子20と、第1の結着剤30と、第2の結着剤40とを備えている。第1の結着剤30は、第1の粒子10の表面を被覆している。第2の粒子20は、第1の結着剤30の表面を被覆している。第2の結着剤40は、第2の粒子20の表面を被覆し、また冶金用粉末の隙間に存在する。
また第1および第2の粒子10、20は、同じ材料であっても、異なる材料であってもよい。
図1および図2に示すように、まず、複数の第1の粒子10の表面に第1の結着剤30を被覆する(ステップS1)。本実施の形態では、鉄基粒子を含む第1の粒子10を用いる。
この場合、第1および第2の粒子10、20の粒径の差が明確になるため、粗粒である第1の粒子10の効果および微粒である第2の粒子の効果をより発現することができる。
第2の粒子20を被覆するステップS2中、または、第2の粒子20を被覆するステップS2の後のいずれに行なってもよい。また、このステップS3は省略してもよい。
これにより、第2の結着剤40を溶融させて第2の鉄基粒子21の表面に付着させることができる。この状態で乾燥すると、図1に示すように、第2の粒子20の表面、第1および第2の粒子10、20間などの隙間に第2の結着剤40を付着することができる。なお、このステップS3は省略されてもよい。
図4に示す本実施の形態における冶金用粉末は、基本的には図1に示す実施の形態1における冶金用粉末と同様の構成を備えているが、第1および第2の粒子10、20は、第1および第2の鉄基粒子11、21と、第1および第2の鉄基粒子11、21の表面を取り囲む第1および第2の絶縁被膜12、22とをそれぞれ含む点において異なっている。
図5を参照して、本実施の形態における圧粉磁心について説明する。図5に示すように、本実施の形態における圧粉磁心は、実施の形態2における冶金用粉末を加圧成形してなる。
まず、基本的には実施の形態2にしたがって、本発明例1の冶金用粉末を製造した。
本発明例2の冶金用粉末の製造方法は、基本的には本発明例1と同様であったが、第1および第2の鉄基粒子11、21は、Siを6.5質量%含み、残部がFeおよび不可避的不純物(Fe-Si系合金)からなっていた点において異なっていた。
本発明例3の冶金用粉末の製造方法は、基本的には本発明例2と同様であったが、第1および第2の鉄基粒子11、21は、9.5質量%のSiと、5.5質量%のAlとを含み、残部がFeおよび不可避的不純物(Fe-Si-Al系合金)からなっていた点において異なっていた。
比較例1、4、7の冶金用粉末の製造方法は、基本的には本発明例1~3とそれぞれ同様であったが、第2の粒子を含んでいない点において異なっていた。
比較例2、5、8の冶金用粉末の製造方法は、基本的には本発明例1~3とそれぞれ同様であったが、第1の粒子を含んでいない点において異なっていた。
比較例3、6、9の冶金用粉末の製造方法は、基本的には本発明例1~3とそれぞれ同様であったが、第1および第2の粒子とを同時に混合した状態で結着剤をさらに混合した点において異なっていた。
次に、第1の粒子と、この第1の粒子に対して7/3の質量比になるように第2の粒子を混合し、準備した結着剤をさらに混合した。
本発明例1~3および比較例1~9の冶金用粉末について、本発明例1~3および比較例1~9の冶金用粉末について、金型を用いて680MPaの圧力を印加して成形体をそれぞれ作製した(ステップS11)。そして、この成形体について、300℃で1時間、大気中で熱処理し、その後750℃で1時間、窒素を含む雰囲気中で熱処理した(ステップS12)。これにより、本発明例1~3および比較例1~9の冶金用粉末を加圧成形してなる評価用の成形体を作製した。
(ヒステリシス損)=(ヒステリシス損係数)×(周波数)
(渦電流損)=(渦電流損係数)×(周波数)2
鉄損、ヒステリシス損および渦電流損の値は、小さいほど好ましい。
表1に示すように、第1および第2の粒子を構成する第1および第2の鉄基粒子として、Fe-5.0Siを用いた本発明例1と、比較例1~3とを比較して、本発明例1は比較例1~3よりも成形体密度および相対密度が最も高く、かつ本発明例1は、微粒のみを備えた比較例2よりは高いものの、粗粒のみを備えた比較例2、および微粒と粗粒とを混合した比較例3よりも渦電流損失が低かった。
また、本発明例1~3は比較例1~3、4~6、7~9とそれぞれ比較して、磁束密度を向上でき、かつ高い透磁率を維持し、かつDCバイアス透磁率を向上でき、かつDCバイアス透磁率の低下率を低減することができた。
Claims (7)
- 複数の第1の粒子の表面に第1の結着剤を被覆する工程と、
前記第1の結着剤の表面に、前記第1の粒子の粒径よりも小さな粒径を有する複数の第2の粒子を被覆する工程とを備えた、冶金用粉末の製造方法。 - 前記第2の粒子を被覆する工程では、前記第1の粒子の粒径の1/5倍以下の粒径を有する複数の第2の粒子を用いる、請求項1に記載の冶金用粉末の製造方法。
- 前記第2の粒子を被覆する工程中、または、前記第2の粒子を被覆する工程の後に、第2の結着剤を投入する工程をさらに備えた、請求項1に記載の冶金用粉末の製造方法。
- 前記第1の結着剤を被覆する工程では、第1の鉄基粒子と、前記第1の鉄基粒子の表面を取り囲む第1の絶縁被膜とを有する前記第1の粒子を用い、
前記第2の粒子を被覆する工程では、第2の鉄基粒子と、前記第2の鉄基粒子の表面を取り囲む第2の絶縁被膜とを有する前記第2の粒子を用いる、請求項1~3のいずれか1項に記載の冶金用粉末の製造方法。 - 請求項1~4のいずれか1項に記載の冶金用粉末の製造方法により冶金用粉末を製造する工程と、
前記冶金用粉末を加圧成形する工程とを備えた、圧粉磁心の製造方法。 - 請求項5に記載の圧粉磁心の製造方法により製造された、圧粉磁心。
- 請求項6の圧粉磁心を備えた、コイル部品。
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EP10733419A EP2380685A1 (en) | 2009-01-22 | 2010-01-14 | Process for producing metallurgical powder, process for producing powder magnetic core, powder magnetic core, and coil component |
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US13/145,961 US20110285486A1 (en) | 2009-01-22 | 2010-01-14 | Process for producing metallurgical powder, process for producing dust core, dust core, and coil component |
KR1020117015527A KR101335820B1 (ko) | 2009-01-22 | 2010-01-14 | 야금용 분말의 제조 방법, 압분자심의 제조 방법, 압분자심 및 코일 부품 |
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CN102292177A (zh) | 2011-12-21 |
JPWO2010084812A1 (ja) | 2012-07-19 |
KR101335820B1 (ko) | 2013-12-03 |
TW201034775A (en) | 2010-10-01 |
US20110285486A1 (en) | 2011-11-24 |
KR20110099717A (ko) | 2011-09-08 |
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