| 摘要 |
PURPOSE:To manufacture a composite noble metal alloy firmly bound and free from cracking, by subjecting a base metal powder to Ni plating, by mixing a noble metal powder with the above, and by subjecting the resulting powder mixture to compacting into prescribed shape, to sintering, and then to aftertreatment workings. CONSTITUTION:Electrolytic or electroless plating of Ni is applied to a pure-Ti powder (several microns - several millimeters grain size) to form an Ni-plated film of 100Angstrom - several tens microns thickness. Then prescribed amounts of gold powder 4 is mixed with this Ni-plated powder 2, and the resulting powder mixture is compacted into prescribed shape by cold or hot pressing. This green compact 6 is sintered at 850-1,050 deg.C for about 30min-2hr in a sintering stage 5, and the sintered compact 8 is subjected to gold plating 9a in an aftertreatment state 7. The above gold-plated compact is further subjected to dry honing, et., to undergo exposure of the pure-Ti surface in a surface-finishing stage 10 and then to coloring by means of anodic oxidation, etc., in a coloring stage 11.
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