| 摘要 |
PROBLEM TO BE SOLVED: To provide a cemented carbide which has excellent wear resistance, chipping resistance and welding resistance even in high speed cutting and high feed cutting, and in which the using amount of WC is reduced compared with the conventional cemented carbide. SOLUTION: In the cemented carbide composed of a hard phase component comprising WC, Ti(C, N) and (Ta, Nb)C (including the case of Nb=0) and a binding phase component of Co and/or Ni, the ratio of the hard phase component lies in the range of 80 to 92 wt.% and the ratio of the binding phase component lies in the range of 8 to 20 wt.%, and its structure is composed of four phases of a WC phase, a (W, Ti, Ta, Nb)(C, N) phase (including the case of Nb=0), a Ti(C, N) phase and a binding phase, wherein, regarding the area ratio of each phase measured by scanning electron microscopy, that of the WC phase lies in the range of 10 to 45%, that of the (W, Ti, Ta, Nb)(C, N) phase lies in the range of 30 to 60% and that of the Ti(C, N) phase lies in the range of 5 to 25%, and the balance binding phase. COPYRIGHT: (C)2010,JPO&INPIT
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