| 摘要 |
A cemented carbide contains a binder phase of 4 to 35% by weight of at least one of cobalt and nickel, 1 to 50 ppm by weight of impurities and a hard dispersed phase of balance tungsten carbide. The tungsten carbide has an average crystal grain size ranging from 0.2 to 1.5 mu m. The grain size of the impurities is not larger than 10 mu m. The binder phase has an average crystal grain size of 5 to 400 mu m. The cemented carbide may contain a binder phase of 4 to 35% by weight of at least one of cobalt and nickel, 1 to 50 ppm by weight of impurities, and a hard dispersed phase of 0.1 to 40% by weight of at least one compound and balance tungsten carbide. The compound may be carbides of metals in Groups IVA, VA and VIA of the Periodic Table other than tungsten, nitrides of metals in Groups IVA and VA of the Periodic Table or solid solution of at least two of the carbides and nitrides.
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