| 摘要 |
PROBLEM TO BE SOLVED: To provide hyperfine-particulate cemented carbide which has toughness, oxidation resistance and heat resistance, and contains tungsten carbide particles of a mean particle diameter of≤0.6μm. SOLUTION: The tungsten carbide-cemented carbide comprises 2 to 30% of one or more kinds selected from Co and Ni, 0.1 to 2.0% V, 0.1 to 2.0% Cr, and 0.01 to <0.4% Ta, and the balance tungsten carbide with inevitable impurities, and in which the mean particle diameter of tungsten carbide is≤0.6μm, and is obtained by performing rapid cooling after pressure sintering. COPYRIGHT: (C)2003,JPO
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