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Okuno Takuya,Hirose Kazuhiro,Moriguchi Hideki,Yamamoto Eiji,Uchino Katsuya,Kitagawa Nobuyuki 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In recent years, PCB drills with smaller diameters less than 0.1 mm are used and thus there are growing needs for ultra-fine grained cemented carbides. However, ultra-fine WC powder usually causes extraordinary grain growth during sintering which weakens mechanical strength of ultra-fine grained cemented carbides. So we examined several kinds of WC powders to make new ultra-fine grained cemented carbides having superior performance. We found that direct carburized WC powder is very good as a WC raw material. The PCB drills made of the developed ultra-fine grained cemented carbides have higher hardness, toughness and stiffness than conventional ones.