Alloys or metallic compositions – Palladium base – Copper containing
Patent
1984-05-30
1985-05-21
Rutledge, L. Dewayne
Alloys or metallic compositions
Palladium base
Copper containing
433207, C22C 504
Patent
active
045185646
ABSTRACT:
A dental alloy for porcelain-fused-to-metal restorations is provided which consists essentially of, on a weight basis, about 60-90% palladium, an effective amount of ruthenium up to about 2% for the purpose of grain-refining the alloy, an effective amount of copper up to about 30% for the purpose of lowering the melting point and raising the thermal expansion, up to about 15% indium, up to about 16% tin, up to about 12% zinc, up to about 5% gold, and from about 0.05 to about 0.25% boron or calcium boride, the total of said constituents being 100%, wherein the sum of the copper, indium, tin and zinc concentrations is greater than about 18%, the sum of the indium, tin and zinc concentrations is greater than about 10%, and the sum of the indium and zinc concentrations is greater than about 5%, such that said alloy exhibits a melting point between about 1100.degree. C. and 1400.degree. C. and a coefficient of thermal expansion of about 0.66 to 0.72 at 500.degree. C. To ensure essentially bubble-free restorations, the alloy is preferably made in a ceramic, rather than a carbon-containing, crucible and in a protective environment.
REFERENCES:
patent: 3914867 (1975-10-01), Manning et al.
patent: 4319877 (1982-03-01), Boyajian
patent: 4336290 (1982-06-01), Tsai
Jeneric Industries, Inc.
Kramer Barry
McDowell Robert L.
Rutledge L. Dewayne
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