+

WO2001049437A2 - Piece moulee frittee produite par metallurgie des poudres - Google Patents

Piece moulee frittee produite par metallurgie des poudres Download PDF

Info

Publication number
WO2001049437A2
WO2001049437A2 PCT/EP2001/000039 EP0100039W WO0149437A2 WO 2001049437 A2 WO2001049437 A2 WO 2001049437A2 EP 0100039 W EP0100039 W EP 0100039W WO 0149437 A2 WO0149437 A2 WO 0149437A2
Authority
WO
WIPO (PCT)
Prior art keywords
powder
weight
molding according
steel
phosphorus
Prior art date
Application number
PCT/EP2001/000039
Other languages
German (de)
English (en)
Other versions
WO2001049437A3 (fr
Inventor
Kirit Dalal
Ekkehard KÖHLER
Original Assignee
Bleistahl-Produktions Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10016830A external-priority patent/DE10016830A1/de
Application filed by Bleistahl-Produktions Gmbh & Co. Kg filed Critical Bleistahl-Produktions Gmbh & Co. Kg
Priority to AU33681/01A priority Critical patent/AU3368101A/en
Publication of WO2001049437A2 publication Critical patent/WO2001049437A2/fr
Publication of WO2001049437A3 publication Critical patent/WO2001049437A3/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C22C33/0214—Using a mixture of prealloyed powders or a master alloy comprising P or a phosphorus compound
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials

Definitions

  • the invention relates to a powder metallurgy sintered molded part with high temperature and wear resistance, which is in particular a valve seat ring for internal combustion engines.
  • Intake and exhaust valves for internal combustion engines must meet high requirements for temperature resistance and wear resistance. Particularly in the case of highly compressed, modern engines with multi-valve technology and electronic control, it has become an increasing problem to find materials that can permanently cope with the high temperatures at the outlet. Accordingly, valves and valve parts have become increasingly complex to manufacture, which has had an impact on the material and processing costs.
  • Powder-metallurgical processes are often used to manufacture valve seat rings.
  • the reasons for this are the good controllability of the composition and structure, high manufacturing accuracy with low tolerances, the good adjustability of the properties and, in particular, the high stability of the materials with good temperature behavior.
  • valve seat rings for exhaust valves where high temperature and wear resistance are important, solid lubricant-containing materials from the COMO family have set the standard. These are MnS-containing, powder-metallurgically manufactured cobalt-molybdenum-iron alloys with a comparatively high cobalt content (see also DE 34 13 593 C1). Valve seat rings made from this have proven themselves many times, but are extremely cost-intensive in terms of production and mechanical processing.
  • Cobalt is a relatively expensive raw material, which is also prone to crisis because of the unfavorable distribution of the deposits.
  • the structure of a valve seat ring manufactured using powder metallurgy consists of a matrix of Fe and / or Cu and hard phases and solid lubricants embedded therein.
  • metal carbides or intermetallic hard phases are suitable as hard phases.
  • Common solid lubricants are MnS, CaF 2 , BN and in particular MoS 2 or its reaction products under powder metallurgical sintering conditions.
  • the invention has for its object to provide, in particular, valve seat rings with high temperature and wear resistance for modern high-performance engines, which are accessible and inexpensive to manufacture using proven powder metallurgy processes.
  • a sintered molded part of the type mentioned at the outset consisting of a molybdenum-phosphorus-carbon steel powder (Mo-PC powder) and at least one further, essentially phosphorus-free steel powder in a weight ratio of 5:95 to 60:40 , Carbon and at least one solid lubricant is available.
  • Mo-PC powder molybdenum-phosphorus-carbon steel powder
  • essentially phosphorus-free steel powder in a weight ratio of 5:95 to 60:40 , Carbon and at least one solid lubricant is available.
  • the sintered molded parts according to the invention can be used in particular as valve seat rings. However, they can also be used for other, especially tribological parts in engine and transmission construction.
  • the sintered molded parts contain at least two steel components, the interaction of which makes up the high temperature and wear resistance.
  • the two steel components are used as finished powders. On the one hand it is a Mo-P-C steel powder, on the other hand it is an essentially phosphorus-free steel powder. These two components form the matrix with hard phases embedded therein and a. Metal carbides.
  • the Mo-P-C steel component ensures extraordinarily good dimensional stability of the molded parts produced with it, which cannot be achieved by the second steel component alone. It also has a positive effect on the density of the molded part after sintering.
  • the sintered molded parts according to the invention are essentially free of cobalt.
  • the term "essentially free" in connection with alloy components means that these components are not added deliberately and are only present in the amounts which are usually unavoidable.
  • the steel powder and the carbon make up at least 50% by weight, preferably at least 60% by weight; the rest can consist, for example, of solid lubricant, iron-copper alloy and other additives.
  • the proportion of steel powder and carbon powder consists of at least 75% by weight and preferably at least 85% by weight, in the case of copper-free sintered molded parts, preferably at least 85 and in particular at least 95% by weight.
  • the known solid lubricant is primarily MoS 2 , which is present in quantities of at most 5.0% by weight.
  • the Mo-PC powder used according to the invention preferably contains 0.5 to 1.5% by weight of C, 3.0 to 15% by weight of Mo, 0.2 to 1.0% by weight of P, the rest Iron and inevitable impurities.
  • Mo-P-C steel powder as can be used here, is described, for example, in WO-A-91/18123. Part of the molybdenum can be replaced by tungsten.
  • the phosphorus-free steel powder is preferably a high-speed steel powder.
  • Such high-speed steel powder contains, for example, 0.5 to 1.0% by weight of C, 5.0 to 10% by weight of W, 3.0 to 8.0% by weight of Mo, 1.0 to 3.0% by weight % V, 2.0 to 6.0% by weight Cr and possibly small amounts of cobalt.
  • a high-speed steel in question has the designation AISI M3 / 2 (DIN S-6-5-3), for example.
  • Mo-PC powder and high-speed steel powder are advantageously used in a weight ratio of 40:60 to 60:40.
  • the powder mixture advantageously contains 0.1 to 1.0% by weight of carbon in the form of graphite or the like and 1.0 to 3.5% by weight of MoS 2 .
  • a sintered molded part produced by powder metallurgy from such a powder mixture has, in addition to extremely high wear resistance, the high temperature resistance and stability required for high-performance diesel engines.
  • sintered molded parts produced according to the invention from Mo-PC steel powder and a conventional one phosphorus-free, low-alloy steel powder with, for example, 0.1 to 2.0% by weight of Cr, 0.5 to 3.0% by weight of Mo, 0.1 to 1.4% by weight of Mn and 0.1 to 1 , 4 wt .-% Ni can be obtained.
  • the ratio of Mo-PC powder to powder made of phosphorus-free steel is advantageously 50:50 to 5:95 by weight.
  • the proportion of added carbon is 0.1 to 1.5% by weight, that of the added solid lubricant is 1.0 to 3.5% by weight MoS 2 .
  • further metals can be mixed in, for example chromium, molybdenum or tungsten, for example in amounts of up to 2.0% by weight.
  • the sintered molded parts according to the invention or the metal powder used for its production can have a total of approximately the following composition by weight: 0.5 to 2.0% C, 5.0 to 16.0% Mo, 0.2 to 1.0 % P, up to 1.4% Mn, up to 5.0% Cr, up to 5.0% S, up to 7.0% W, up to 3.0% V, up to 15% Cu, less than 2.0% other elements and the rest Fe. Small amounts of Co and / or Ni, less than 2.0% by weight, may be present in the other elements.
  • Sintered molded parts made of Mo-P-C powder and low-alloy steel powder in particular can contain 2.0 to 20% by weight of Cu to improve the thermal behavior.
  • This copper portion can be introduced into the finished molded part both by infiltration and in the form of copper powder or powder of a copper iron alloy in the powder mixture used for the production. The latter is preferred for cost reasons.
  • mixtures of several steel powders can also be used according to the invention. This applies to both Mo-PC steel powder, where the content of molybdenum or phosphorus can be varied, as well as high-speed steel or low-alloy steel.
  • a steel of the type SAE4701 is a phosphorus-free steel component prefers.
  • the steel powders are alloyed powders.
  • the carbon causes the formation of temperature-resistant and wear-reducing carbide phases, which give the material the necessary service life.
  • Chromium, vanadium and tungsten can be added to vary the property spectrum, but are not absolutely necessary.
  • the Mo-P-C steel can contain tungsten.
  • the moldings produced by powder metallurgy according to the invention can be produced by conventional press-sintering processes. This also includes powder forging, although not absolutely necessary. In general, compression to 7.0 g / cm 3 is sufficient for valve seat rings, although a higher density, in particular about 7.2 or 7.3 g / cm 3 and more, is advantageous for numerous purposes. By increasing the density, which is also achieved in particular by alloying copper, and the associated reduction in the pore volume, there is also an improvement in the thermal conductivity and thus the temperature behavior. Furthermore, the stability is increased.
  • the molded parts according to the invention can be produced from the corresponding element powders, it has been shown that products with superior properties are obtained when the alloyed steels are used. It is particularly preferred to use metal powders of irregular shape produced by atomization processes, which can give the pressed part produced therefrom a certain internal cohesion by means of teeth. To improve processability, reduce wear in the presses and improve cohesion, customary auxiliaries can be added, for example wax, in an amount of up to 1.0% by weight, based on the alloy powder.
  • Spattery steel powders with an average diameter of less than 150 ⁇ m are preferably used, preferably down to 50 ⁇ m. Carbon is expediently used as graphite with an average grain size of less admixed as 10 ⁇ m or less.
  • the Mo-PC steel powder, as can be used here, is described in WO-A-91/18123.
  • the sintered shaped bodies according to the invention can also be shaped bodies other than valve seat rings for inlet and outlet valves.
  • molded parts according to the invention can in particular also be cams / support rings for camshafts or rocker arm plates and inserts for bucket tappets in the cam follower system or other tribological parts which are subject to wear at high temperatures.
  • the sintered shaped bodies according to the invention are produced from the premixed powder as follows: First, the blank is made from the powder
  • the pressure is advantageously between 500 and 900 MPa. After pressing it will
  • the molybdenum-phosphorus-carbon steel had the composition 1.3% by weight of carbon, 9.91% by weight of molybdenum, 0.59% by weight of phosphorus, the rest: iron.
  • the high-speed steel powder consisted of 0.8% by weight of carbon, 6.66% by weight of tungsten, 5.4% by weight of molybdenum, 1.5% by weight of vanadium, 4.49% by weight of chromium, the rest : Iron. Other elements: unavoidable pollution.
  • the mixture thus contained 1.26% by weight of carbon, 3.11% by weight of tungsten, 9.27% by weight of molybdenum, 0.91% by weight of vanadium, 2.1% by weight of chromium, 0 , 29% by weight phosphorus and 1, 2% by weight sulfur.
  • the sintered body obtained therefrom had a density of 7.15 g / cm 3 and the hardness was 370 to 420 HB after sintering. After the heat treatment and the finishing, the valve seat rings produced in this way showed excellent temperature and wear behavior.
  • the warm hardness of the material according to the invention (MS XXX) is shown in the accompanying figure for the temperature range from 20 ° C. to 600 ° C. For comparison, the hot hardening for a conventional material from the COMO family (COMO FS) and the high-speed steel itself are shown. MS XXX shows clear advantages in the high temperature range.
  • the Mo-PC steel powder had the composition known from Example 1.
  • the iron copper alloy consisted of 80 parts by weight Iron and 20 parts by weight copper.
  • the Cr steel had a chromium content of 3.0% by weight for 97% by weight of iron.
  • the hardness of the sintered shaped body was 360 to 390 HB, and after tempering at 600 ° C 350 to 360 HB.
  • Valve seat rings made from it were ideally suited for use in car petrol engines.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Powder Metallurgy (AREA)

Abstract

La présente invention concerne une pièce moulée frittée, produite par la métallurgie des poudres, présentant une grande résistance thermique et résistance à l'usure. Cette pièce moulée est obtenue à partir d'un mélange pulvérulent comprenant de la poudre de molybdène-phosphore-carbone-acier, au moins une autre poudre d'acier, sensiblement exempte de phosphore, dans un rapport de poids allant de 5:95 à 60:40, de la poudre de carbone, ainsi qu'au moins un lubrifiant solide. La pièce moulée selon cette invention peut notamment être utilisée dans l'industrie automobile, pour des parties tribologiques.
PCT/EP2001/000039 2000-01-06 2001-01-04 Piece moulee frittee produite par metallurgie des poudres WO2001049437A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU33681/01A AU3368101A (en) 2000-01-06 2001-01-04 Powder metallurgy produced sinter shaped part

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE10000158.0 2000-01-06
DE10000158 2000-01-06
DE10014769.0 2000-03-27
DE10014769 2000-03-27
DE10016830.2 2000-04-06
DE10016830A DE10016830A1 (de) 2000-01-06 2000-04-06 Pulvermetallurgisch hergestelltes Sinter-Formteil

Publications (2)

Publication Number Publication Date
WO2001049437A2 true WO2001049437A2 (fr) 2001-07-12
WO2001049437A3 WO2001049437A3 (fr) 2002-02-14

Family

ID=27213549

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/000039 WO2001049437A2 (fr) 2000-01-06 2001-01-04 Piece moulee frittee produite par metallurgie des poudres

Country Status (2)

Country Link
AU (1) AU3368101A (fr)
WO (1) WO2001049437A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1375841A2 (fr) 2002-06-27 2004-01-02 Eaton Corporation Siège de soupape rapporté en matériau fritté
DE102013210895A1 (de) 2013-06-11 2014-12-11 Mahle International Gmbh Verfahren zur Herstellung von warmbeständigen und verschleißfesten Formteilen, insbesondere Motorkomponenten
EP2870328B1 (fr) 2012-07-04 2016-11-16 Bleistahl-Produktions GmbH & Co KG. Siège de soupape rapporté à conductivité thermique élevée

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2428091A1 (de) * 1973-06-11 1975-01-16 Toyota Motor Co Ltd Verschleissfeste eisenhaltige sinterlegierung
DE3506275A1 (de) * 1984-02-24 1985-08-29 Mazda Motor Corp., Hiroshima Verfahren zum verbinden von poroesen metallkoerpern und nach dem verfahren hergestelltes produkt
WO1987000207A1 (fr) * 1985-06-29 1987-01-15 Robert Bosch Gmbh Alliages frittables a base d'aciers rapides
FR2596067A1 (fr) * 1986-03-19 1987-09-25 Metafram Alliages Fritte Procede de fabrication de pieces en acier rapide fritte
DE3730082A1 (de) * 1986-09-08 1988-03-10 Mazda Motor Verfahren zur herstellung eisenhaltiger sinterlegierungen mit erhoehter abriebfestigkeit
US4964908A (en) * 1986-11-21 1990-10-23 Manganese Bronze Limited High density sintered ferrous alloys
WO1991018123A1 (fr) * 1990-05-14 1991-11-28 Höganäs Ab Poudre a base de fer, composant realise a partir de cette poudre, et procede de preparation du composant

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61270518A (ja) * 1985-05-22 1986-11-29 Toyota Motor Corp 焼結カムシヤフト

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2428091A1 (de) * 1973-06-11 1975-01-16 Toyota Motor Co Ltd Verschleissfeste eisenhaltige sinterlegierung
DE3506275A1 (de) * 1984-02-24 1985-08-29 Mazda Motor Corp., Hiroshima Verfahren zum verbinden von poroesen metallkoerpern und nach dem verfahren hergestelltes produkt
WO1987000207A1 (fr) * 1985-06-29 1987-01-15 Robert Bosch Gmbh Alliages frittables a base d'aciers rapides
FR2596067A1 (fr) * 1986-03-19 1987-09-25 Metafram Alliages Fritte Procede de fabrication de pieces en acier rapide fritte
DE3730082A1 (de) * 1986-09-08 1988-03-10 Mazda Motor Verfahren zur herstellung eisenhaltiger sinterlegierungen mit erhoehter abriebfestigkeit
US4964908A (en) * 1986-11-21 1990-10-23 Manganese Bronze Limited High density sintered ferrous alloys
WO1991018123A1 (fr) * 1990-05-14 1991-11-28 Höganäs Ab Poudre a base de fer, composant realise a partir de cette poudre, et procede de preparation du composant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE CHEMABS [Online] CHEMICAL ABSTRACTS SERVICE, COLUMBUS, OHIO, US; MURASE, HIROYUKI: "Wear resistant sintered camshafts" retrieved from STN Database accession no. 107:11319 CA XP002171319 & JP 61 270518 A (TOYOTA MOTOR CORP., JAPAN) 29. November 1986 (1986-11-29) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1375841A2 (fr) 2002-06-27 2004-01-02 Eaton Corporation Siège de soupape rapporté en matériau fritté
EP1375841A3 (fr) * 2002-06-27 2008-08-27 Eaton Corporation Siège de soupape rapporté en matériau fritté
EP2870328B1 (fr) 2012-07-04 2016-11-16 Bleistahl-Produktions GmbH & Co KG. Siège de soupape rapporté à conductivité thermique élevée
DE102013210895A1 (de) 2013-06-11 2014-12-11 Mahle International Gmbh Verfahren zur Herstellung von warmbeständigen und verschleißfesten Formteilen, insbesondere Motorkomponenten

Also Published As

Publication number Publication date
AU3368101A (en) 2001-07-16
WO2001049437A3 (fr) 2002-02-14

Similar Documents

Publication Publication Date Title
DE69906221T2 (de) Ventilsitz aus Metallpulver
JP2687125B2 (ja) エンジン用バルブ部品に用いる焼結金属コンパクトおよびその製造方法。
JP2799235B2 (ja) 内燃機関用弁座インサートおよびその製造方法
DE102006048442B4 (de) Fertigungsverfahren für ein verschleißfestes Sinterelement, einen gesinterten Ventilsitz, und Fertigungsverfahren hierfür
DE2846122C2 (de) Sinterlegierung für die Herstellung von Gleitelementen für Motoren
DE60203893T2 (de) Verfahren zur herstellung eines kupfer enthaltenden gesinterten eisenmateriales
DE60208848T2 (de) Pulvermetallurgische Ventilführung
EP3325194B1 (fr) Système tribologique comprenant un siège de soupape et une soupape
DE19705527A1 (de) Gesinterte Legierung auf Eisenbasis mit Hartpartikeldispersion und Verfahren zu deren Herstellung
US4778522A (en) Wear resistant iron-base sintered alloy
US5221321A (en) Fe-base sintered alloy for valve seats for use in internal combustion engines
DE3224420C2 (de) Verfahren zur Nachbehandlung eines gesinterten Gleitelements
GB2109004A (en) Anti-wear sintered alloy and process for the manufacture thereof
JPH0350824B2 (fr)
JPH0350823B2 (fr)
DE69503591T2 (de) Wärmebeständige, gesinterte Eisen-Legierung für einen Ventilsitz
JP4693170B2 (ja) 耐摩耗性焼結合金およびその製造方法
DE60002470T2 (de) Sinterstahlwerkstoff
KR20030021916A (ko) 내마모성이 강화된 밸브 시이트용 소결합금재 조성물 및그의 제조방법
US4844024A (en) Heat resistant and wear resistant iron-base sintered alloy
WO2001049437A2 (fr) Piece moulee frittee produite par metallurgie des poudres
DE10016830A1 (de) Pulvermetallurgisch hergestelltes Sinter-Formteil
KR950014353B1 (ko) 밸브시트용 철계소결합금 및 그 제조방법
EP0334968B1 (fr) Poudre d'acier allie composite et acier allie fritte
JPS61291954A (ja) 高温耐摩耐食焼結材料及びその製造方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
AK Designated states

Kind code of ref document: A3

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载