| 摘要 |
PROBLEM TO BE SOLVED: To provide fine-grained cemented carbide in which alloy structure is uniformly refined and grain growth of hard phase is suppressed to a greater extent and which has excellent strength and toughness. SOLUTION: The fine-grained cemented carbide consists of a hard phase and the balance consisting of a binder phase, additive agents, and inevitable impurities and has≥20 coercive force Hc(kA/m). WC is contained as the hard phase, and 2 to 15 wt.% Co is contained as the binder phase. As the additive agents, both of a first metal consisting of one or more elements selected from Ti, Zr, Hf, Nb, and Al and a second metal consisting of one or more elements selected from Cr, Ta, and V are contained. The first metal is used in a total quantity of 0.01 to 5 wt.% and added in the form of one or more kinds selected from metals as simple substances, solid solutions thereof, compounds with one or more elements selected from carbon, nitrogen, oxygen, and boron, and complex compounds. The weight ratio of the total quantity of the second metal to the binder phase is made to 0.02 to 0.5. COPYRIGHT: (C)2005,JPO&NCIPI
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