| 摘要 |
PURPOSE:To obtain a Pt alloy for accessories with superior mechanical strength and castability as well as superior workability by adding specified amounts of In and Cu to Pt as a principal component. CONSTITUTION:The composition of a Pt alloy used as a material for a ring, a necklace, a brooch, a tiepin, cuff links, etc. is composed of 84-96wt% Pt, 1- 10wt% In and the balance Cu. The reason for the addition of In is that In improves the mechanical strength and castability while satisfying the requirements that the reaction with a casting mold must be inhibited during casting and that the concn. of oxygen can be controlled during casting. When the In content exceeds 10wt%, the workability is remarkably deteriorated. The reason for the addition of Cu is that Cu further improves the mechanical strength by hardening.
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