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US20020098108A1 - 22k gold alloy compositions - Google Patents

22k gold alloy compositions Download PDF

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Publication number
US20020098108A1
US20020098108A1 US09/943,987 US94398701A US2002098108A1 US 20020098108 A1 US20020098108 A1 US 20020098108A1 US 94398701 A US94398701 A US 94398701A US 2002098108 A1 US2002098108 A1 US 2002098108A1
Authority
US
United States
Prior art keywords
gold
alloy
alloys
jewelry
hardness
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US09/943,987
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English (en)
Inventor
Arthur Taylor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wr Cobb Co
Original Assignee
Wr Cobb Co
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
Application filed by Wr Cobb Co filed Critical Wr Cobb Co
Priority to US09/943,987 priority Critical patent/US20020098108A1/en
Assigned to W.R. COBB CO. reassignment W.R. COBB CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TAYLOR, ARTHUR D.
Publication of US20020098108A1 publication Critical patent/US20020098108A1/en
Abandoned legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C27/00—Making jewellery or other personal adornments
    • A44C27/001—Materials for manufacturing jewellery
    • A44C27/002—Metallic materials
    • A44C27/003—Metallic alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/02—Alloys based on gold
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/06—Alloys based on silver
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/06—Alloys based on silver
    • C22C5/08—Alloys based on silver with copper as the next major constituent

Definitions

  • This invention is in the general field of gold alloys and is concerned more particularly with a range of novel 22 karat gold alloy formulations.
  • the quality of gold jewelry typically ranges from 8 to 24 karat. Eight and nine karat gold alloys have minimal corrosion resistance, even in the best of a limited group of formulations.
  • the new alloys according to my invention have the following general composition by weight:
  • This 22 k alloy is made by combining gold with a master alloy having a composition as follows:
  • FIG. 1 is a graph depicting the results of comparative studies described below.
  • Toxic elements Jewelry is often worn against the skin and is subject to a wide range of mechanical, chemical and temperature conditions. Element additions which might be effective in improving 22 k gold characteristics in a semi-conductor application may not be suitable for jewelry use. As an example, due to the adverse dermatologic events associated with nickel in gold jewelry, laws severly restrict the sale of gold jewelry containing that element in the EEC.
  • Cobalt in conjunction with boron creates a desirable fine-grained structure in both the work hardened and fully annealed states. Boron also sharply decreases the rate of copper oxidation during melting by preferentially combining with oxygen over copper thus increasing the number of times the alloy may be reused prior to chemical refining.
  • the boron containing formulation has increased fluidity at temperatures above the melting point. Thus, casting operations can be conducted a lower temperatures than comparable 22 k alloys. Increased molten alloy fluidity also facilitates the casting of intricate designs. Copper increases the hardness of the alloy while without bleaching the desirable yellow gold color. All elements of the new compositions are standard to the industry. Each of the elements is safely used in jewelry alloys.
  • FIG. 1 is a graph comparing the above sample alloy to known alloys 82-86 described in the Background, above.
  • the inventive 22 k gold alloy has the following desirable characteristics compared to alloys 82-86 described in the Background, above:
  • the new alloy color is described as golden yellow versus orange-red, dark yellow, light yellow and green-yellow for alloys 82 through 86 respectively. Alloys 82, 83, 85 and 86 have colors generally unacceptable to the jewelry industry.
  • Alloys according to the invention generally may be melted and worked by any of the methods and techniques known in the art of making articles of jewelry of 10-18 K. They lend themselves readily to casting operations and may be repeatedly re-cast and re-alloyed without suffering loss of quality. These alloys may be subjected without difficulty to working methods such as wire drawing, punching and stamping.
  • alloys as described may be improved by the addition of small quantities of further elements, for instance, silicon or phosphorous up to 0.2% if the primary usage is investment casting.
  • silicon or phosphorous up to 0.2% if the primary usage is investment casting.
  • the addition of 0.05% silicon will improve the surface of investment cast pieces by creating a silicon oxide barrier between the solidified investment powder and the molten gold alloy.
  • a 22 K alloy such as the above sample alloy containing 91.67% gold, 4.00% silver, 0.40% cobalt, 0.025% boron and the remainder copper can be continuous cast into bars or rods.
  • the bars can be repeatedly reduced by up to 70% in thickness and softened by annealing at 1250 F by traditional fabrication and annealing techniques. Such bars can be reduced to any desired thickness.
  • any Brinell (Hb) hardness value from 83 to 134 can be achieved.
  • 22 K cast cylindrical rods can be rolled and drawn into 0.0361′′ diameter round wire.
  • Such wire drawn to a Brinell hardness greater than 130 can machine fabricated into high quality threaded or friction-backed earring posts.
  • earring posts of such small diameter have been difficult or impossible to make using traditional 22 K compositions. Posts of this type have been reserved for harder, lower karat alloys.
  • the best procedure for making up the alloys of the present invention is first to make a master alloy containing all of the constituent elements, except gold.
  • the master alloy compositions are calculated from gold alloy formulations so that when pure gold is added to the master alloy in a ratio to yield a particular karat, the components of the master alloy dilute to effective metallurgical concentrations.
  • the master alloy is actually a karat gold formulation without the gold. Pure gold is added at the time of melting. Master alloys allow manufacturers to inventory relatively low cost compositions which are ready for use with only the addition of pure gold.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Adornments (AREA)
US09/943,987 2000-09-01 2001-08-31 22k gold alloy compositions Abandoned US20020098108A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US09/943,987 US20020098108A1 (en) 2000-09-01 2001-08-31 22k gold alloy compositions

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US22977300P 2000-09-01 2000-09-01
US09/943,987 US20020098108A1 (en) 2000-09-01 2001-08-31 22k gold alloy compositions

Publications (1)

Publication Number Publication Date
US20020098108A1 true US20020098108A1 (en) 2002-07-25

Family

ID=22862610

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/943,987 Abandoned US20020098108A1 (en) 2000-09-01 2001-08-31 22k gold alloy compositions

Country Status (3)

Country Link
US (1) US20020098108A1 (fr)
AU (1) AU2001291280A1 (fr)
WO (1) WO2002018664A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060231171A1 (en) * 2005-04-19 2006-10-19 Davis Samuel A Method for adding boron to metal alloys
US20060260778A1 (en) * 2005-05-19 2006-11-23 Stern Leach Company, A Corporation Of The State Of Delaware Method for adding boron to metal alloys
WO2007083169A1 (fr) * 2006-01-23 2007-07-26 Middlesex Silver Co. Limited Fabrication d’alliage mere

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106702202B (zh) * 2015-11-12 2019-02-15 尊尚（深圳）穿金戴银技术股份有限公司 一种硬质足金及其制备方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2223046A (en) * 1938-12-02 1940-11-26 Metals & Controls Corp Alloy
US5384089A (en) * 1994-05-02 1995-01-24 Diamond; Lawrence H. Yellow karat gold casting alloys

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060231171A1 (en) * 2005-04-19 2006-10-19 Davis Samuel A Method for adding boron to metal alloys
US20060260778A1 (en) * 2005-05-19 2006-11-23 Stern Leach Company, A Corporation Of The State Of Delaware Method for adding boron to metal alloys
WO2007083169A1 (fr) * 2006-01-23 2007-07-26 Middlesex Silver Co. Limited Fabrication d’alliage mere

Also Published As

Publication number Publication date
WO2002018664A1 (fr) 2002-03-07
AU2001291280A1 (en) 2002-03-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: W.R. COBB CO., RHODE ISLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TAYLOR, ARTHUR D.;REEL/FRAME:012281/0289

Effective date: 20011001

STCB Information on status: application discontinuation

Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION

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