Title:
GOLD ORNAMENT MATERIAL HARDENED BY ALLOYING WITH SMALL AMOUNT OF COMPONENT
Document Type and Number:
Japanese Patent JPH0726340
Kind Code:
A
Abstract:
PURPOSE: To produce a gold ornament material having such hardness that it is hard to scratch while maintaining aesthetic value such as color tone and high-grade appearance peculiar to pure gold by alloying pure gold of ≥99% purity with small amts. of specified metals.
CONSTITUTION: Pure gold of ≥99% purity is alloyed with 550-20,000ppm Ca and 10-200ppm La by melting the metals and the resulting alloy is drawn to form a wire having such hardness of ≥100Hv that it is hard to abrade or scratch. The hardness of this alloy wire is not reduced even by heating to 450°C brazing temp. required as an ornament and undergoes no change with the laspe of time.
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Inventors:
UCHIYAMA NAOKI
ISHII TOSHINORI
ISHII TOSHINORI
Application Number:
JP19509893A
Publication Date:
January 27, 1995
Filing Date:
July 12, 1993
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP
International Classes:
A44C27/00; C22C5/02; (IPC1-7): C22C5/02; A44C27/00
Attorney, Agent or Firm:
Kazuo Tomita (1 person outside)
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