CVD ダイヤモンド焼結体の切削工具への適用

概要

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Sintered diamond bodies are widely used as cutting tools, wire drawing dies, scales, and special tips of high pressure apparatus in modern industry. This paper describes CVD diamond sintered bodies for the first time. For that purpose, the reactive sintering processes of CVD diamond powder of 32-47μm synthesized by arc-discharge plasma jet CVD method and natural diamond powder of 20-30μm are examined using the laminated WC-Co under 5.5GPa and 1500-1550℃ for 30-60min in a piano wire wound high pressure apparatus. The obtained diamond sintered bodies are characterized by means of EDAX, SEM, X-ray diffraction, and Raman spectrosecopy. The sintered diamond bodies are finished to cutting tools, and cutting performance is evaluated for turning operations using Al-12wt%Si alloy. From the observations, the sintered diamond bodies are held together by diamond-to-diamond bonding without graphitization. And the CVD diamond sintered bodies have density of about 4.7gcm^<-3>. And the CVD diamond sintered cutting tools have more high resistance against abrasion than the conventional and natural diamond sintered cutting tools.
公益社団法人精密工学会の論文
1992-03-05