| 摘要 |
PURPOSE:To obtain the sintered hard alloy causing no deterioration of strength at room temp., having improved strength at high temp., and excelling in resistance to heat checks as well as in chipping resistance, by incorporating specific volume percentage of Mo or Mo carbides to a WC-(W, Ti, Ta, Nb)-Co alloy. CONSTITUTION:In the sintered hard alloy constituted of WC, a hard phase consisting of (W, Ti, Ta, Nb) C having B.I type crystal structure, and a binding phase consisting of Fe groups mainly composed of Co, 0.1-5vol.% of Mo or Mo carbides are incorporated to the alloy content. In this way, on addition of trace amounts of Mo or Mo carbides having lower elastic modulis than W, larger quantities of W and Mo enter into solid solution in the binding phase, but, by the effect of Mo, the deterioration of strength is hardly brought about at room temp. and the strength at high temp. can be improved.
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