Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1978-02-23
1979-08-28
Rutledge, L. Dewayne
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75172G, C22C 504, C22C 500
Patent
active
041659830
ABSTRACT:
An alloy suitable for use in the fabrication of jewelry containing at least 95% by weight platinum and 1.5 to 3.5% by weight gallium, the balance being at least one of indium, gold, palladium, silver, copper, cobalt, nickel, ruthenium, iridium and rhodium. A Ga/Au/Pt alloy is preferred for ornamental application, and a Ga/In/Pt possibly including gold, silver or palladium is preferred for use in the manufacture of springs and clasps. Alloys are described which comply with hallmarking requirements but yet casting may be effected more easily than with pure platinum.
REFERENCES:
patent: 3357825 (1967-12-01), Douglass
patent: 3819366 (1974-06-01), Katz
patent: 3989515 (1976-11-01), Reiff
patent: 4012228 (1977-03-01), Dudek et al.
Guex et al., "Binary Systems Pt-Al, Pt-Ga & Pt-In" J. Less-Comm. Metal, 46 (1976) 101.
Bourne Alan A.
Knapton Arthur G.
Johnson Matthey & Co., Limited
Roy Upendra
Rutledge L. Dewayne
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