Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)
- 2006.09b
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- Pages.889-890
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- 2006
Mechanical Properties and Drilling Performance of Ultra-fine Grained Cemented Carbide Produced Using Direct Carburized WC Powder
- Okuno, Takuya (Sumitomo Electric Industries LTD) ;
- Hirose, Kazuhiro (Sumitomo Electric Industries LTD) ;
- Moriguchi, Hideki (Sumitomo Electric Industries LTD) ;
- Yamamoto, Eiji (Sumitomo Electric Hardmetal Corp.) ;
- Uchino, Katsuya (Sumitomo Electric Hardmetal Corp.) ;
- Kitagawa, Nobuyuki (Sumitomo Electric Hardmetal Corp.)
- Published : 2006.09.24
Abstract
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.