無コバルトWC焼結体によるダイヤモンドコーティング切削工具の作製

抄録

This paper describes the cutting performance of diamond coated cutting tool prepared with cobaltless tungsten carbide (WC) sintered by spark sintering. The mechanical strength of cobaltless WC cutting tools has been confirmed by turning gray cast iron (FC250). In order to prepare diamond coated cutting tool, diamond film was deposited on the cobaltless WC by microwave plasma CVD and hot filament CVD. The performance of the diamond coated tool has been evaluated, by turning A1-18% Si alloy. As the result, it is found that the diamond coated tool which leads strong adhesion to diamond film can be produced by using cobaltless WC of which sintering density ratio is 70-90% and thickness of coated diamond film is approximately 20 μm.