Metal treatment – Stock – Containing over 50 per cent metal – but no base metal
Patent
1992-10-28
1994-03-01
Roy, Upendra
Metal treatment
Stock
Containing over 50 per cent metal, but no base metal
420463, 420464, 420497, 433208, C22C 500
Patent
active
052903710
ABSTRACT:
A noble metal dental casting alloy for use in making dental restorations comprises 35-70 percent by weight palladium, 25-50 percent by weight silver, 0.5-10 percent by weight manganese, and 1-30 percent of at least one modifier element selected from (i) the group of gold, platinum, copper, tin, gallium, zinc, indium and cobalt in amounts of up to 15 percent by weight each, and (ii) the group of ruthenium, rhenium, aluminum, germanium, lithium, silicon, iridium, boron, tantalum and niobium in amounts of up to 5 percent by weight each. The alloy has a solidus temperature of at least 1100.degree. C., a liquidus temperature of not more than 1400.degree. C., tensile elongation of at least 2 percent, thermal expansion coefficient of at least 14.0.times.10.sup.-6 per .degree.C., Vickers hardness of at least 150, and offset yield strength at 0.2 percent of at least 250 MPa. A dental restoration made from this alloy has a porcelain coating fired upon a portion of the casting, and the coating is firmly bonded to the casting.
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Cameron Thomas B.
Smith, III Edward F.
Roy Upendra
The J. M. Ney Company
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