| 摘要 |
PROBLEM TO BE SOLVED: To provide a gold alloy of ultralow melting point and extremely low casting shrinkage for use as a gold alloy for dental casting in particular. SOLUTION: The alloy has a composition consisting of 30 to 80% gold, 5 to 10% each of indium and zinc, 1 to 6% copper, 0.1 to 3% tin, 0.01 to 5% platinum group element, 0.01 to 3% cobalt and the balance mainly silver, and the total content of indium and zinc is increased to 10 to 20% to obtain the low melting point. In this alloy, removal of the factors inhibiting compatibility are achieved as in the following: the melting point of the alloy is lowered; casting shrinkage and mold deformation are minimized; and the surface accuracy of casting surface is improved. A casting process is simplified and shortened and related equipment and technical operations are simplified, and economic effects are increased. COPYRIGHT: (C)2006,JPO&NCIPI
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