| 摘要 |
PROBLEM TO BE SOLVED: To reduce the ratio of Pd in the alloy without deteriorating its deforming characteristics and to enable its use in a lost wax casting process by allowing the alloy to contain a specified amt. of Cu as well, in which the amt. of Cu is almost inversely proportioned to the amt. of Pd, and the balance one or more kinds among Ir, In, Ag, Zn, Ga, Re, Zr, Nb, Si, Ta and Ti. SOLUTION: A white gold alloy is incorporated with 7 to 17 wt.% Cu. Even in this way, either of the whiteness and metallurgical and mechanical properties of the alloy are not damaged; rather, they are improved, by which the ratio of expensive Pd can substantially be reduced. Further, by introducing small amounts or trace amounts of elements other than Cu, the characteristics of the alloy can be improved. For example, Ir and Re are used as crystal grain refining agents, In reduces the m.p., and Ti, Zr, Nb, Si and Ta improve the finish of the surface.
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