| 摘要 |
PURPOSE:To obtain amber-colored external parts having the color tone of a TaC-based sintered hard alloy by coating ceramics or a sintered hard alloy with a TiC-TiN mixture by ion plating. CONSTITUTION:A case of a WC-based sintered hard alloy 1 is washed and subjected to ionic bombardment with gaseous Ar. A Ti layer 2 is formed on the case by ion plating and treated with gaseous nitrogen to form a TiN layer 3. An amber-colored Ti compd. layer 4 made of a TiC-TiN mixture is then formed with gaseous nitrogen and gaseous acetylene. Thus, a low-cost watch case having satisfactory corrosion resistance, adhesion, fine appearance and the same color tone as a watch case of a TaC-based sintered hard alloy is obtd.
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