METHOD FOR PRODUCING TIME PIECE DECORATIVE PART OF PLATINUM OR PLATINUM ALLOY

PURPOSE: To improve the strength and hardness by diffusing a little amount of an element in the surface of platinum or platinum alloy. CONSTITUTION: If a little amount of boron of ca. 0.05 to 0.3% is diffused in platinum or platinum alloy (Pt-5Pd) by pressurizing or heating, then a hardened layer mo...

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1. Verfasser: SHOJI SETSUO
Format: Patent
Sprache:eng
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Zusammenfassung:PURPOSE: To improve the strength and hardness by diffusing a little amount of an element in the surface of platinum or platinum alloy. CONSTITUTION: If a little amount of boron of ca. 0.05 to 0.3% is diffused in platinum or platinum alloy (Pt-5Pd) by pressurizing or heating, then a hardened layer moves toward inside like dendrite. As the result of experiments on hardening depth, hardness, dimension change (%) and polishing capability with varied processing conditions for hardening, it has been found that the hardening depth, hardness of the hardened layer can be controlled by the hardening processing conditions. Thus, by applying to time piece case or backside lid of time piece decorative part, non-comparable hardness and coupling quality can be obtained.