White gold alloy

Details White gold alloy White gold alloy

1974-06-26

1976-09-21

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

32 8, C22C 502

Patent

active

039817237

ABSTRACT:
A white gold alloy consisting essentially of 50-54% gold, 27-31% palladium, 11-16% silver, about 0.05-0.25% of iridium or ruthenium, and 4.5-8% of indium and tin, provided there is at least 2% indium, no more than 4.5% tin, and further provided that if there is less than about 6% indium, the alloy must contain at least 0.25% tin. The alloy meets or at least narrowly approaches the ADA Spec. No. 5 for Type IV dental casting gold alloys, and is useful for dental appliances and for the fusing of porcelain thereto for dental restorations.

REFERENCES:
patent: 1283264 (1918-10-01), Mowrey
patent: 1296938 (1919-03-01), Fahrenwald
patent: 1987451 (1935-01-01), Taylor
patent: 2980998 (1961-04-01), Coleman et al.
patent: 3413723 (1968-12-01), Wagner et al.
patent: 3667936 (1972-06-01), Katz
patent: 3679402 (1972-07-01), Hirschhorn
patent: 3767391 (1973-10-01), Tuccillo

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