| 摘要 |
PROBLEM TO BE SOLVED: To improve the wear resistance, corrosion resistance and strength of a sintered body by allowing a sintered body to contain at least one or more kinds of VC and Cr3C2 by a specified amt., allowing the balance tungsten carbide to have the specified particle size and composing it of WC single phase having a stoichiometric compsn. SOLUTION: This sintered body contains at least one or more kinds of VC and Cr3C2 by 0.1 to 2 wt.%, and the balance tungsten carbide with <=1μm average particle size and is composed of WC single phase having a stoichiometric compsn. In the production of the sintered body, a lower punch 3 is set to a molding outer frame 1 made of graphite and is filled with mixed raw material powder 4, and an upper punch 2 is set to assemble a sintering assembly. The mixed raw material powder 4 is formed by mixing WC powder with <=0.8μm average particle size with one or more kinds of VC and Cr3C2 by 0.1 to 2 wt.%. The sintering assembly is charged to a conductive sintering machine, the atmosphere of the periphery of a graphite mold 5 is controlled to the vacuum or inert gas one, after that, energizing is executed, and the mixed raw material powder 4 is subjected to press sintering.
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