| 摘要 |
PURPOSE:To obtain a wear resistant sintered hard alloy having superior oxidation resistance by combining a binding phase having a specified total content of Ni, Co, Mo and Cr, specified mutual ratios and a specified total content of Y and a rate earth element with the dispersed phase of W-carbide having a specified grain size. CONSTITUTION:The binding phase consisting of Ni, Co, Mo and Cr in Mo/(Ni+ Co+Cr+Mo)=1/50-1/10, Cr/(Ni+Co+Mo+Cr)=1/20-1/5 and Co/Ni=9/1-1/9 is combined with the dispersed phase of WC having 2-6mum average grain size. The total amount of Ni, Co, Mo and Cr is 10-30wt% and the binding phase further contains 0.01-0.3wt% Y and one or more kinds of rare earth elements. The heat resistant WC-base sintered hard alloy having the high resistances to oxidation, heat, shock, hot wear and thermal fatigue is obtd.
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