亜鉛添加法による高強度WC-Co超硬合金

概要

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The WC, Co and Zn powders, having usual grain size, were used as starting materials, and this mixture was sintered in vacuum or in H<SUB>2</SUB> at 1350-1410°C for 1 hr. As the result, WC-(6-30)%Co alloy specimens without any zinc content were obtained. Various properties of these alloys were studied and the following results were obtained. (1) It was confirmed that extremely high-strength cemented carbide could be obtained by this method, that is, by putting zinc powder in the (WC+Co) mixture. In this case, the other properties besides the strength seemed to be the same as usual alloys. (2) The increase in strength was sharp in WC-(10-15)%Co alloy, and the bending strength were, for example, 370 and 390 kg/mm<SUP>2</SUP> in WC-10%Co and WC-15%Co high carbon two-phase alloys respectively (according to the test of ASTM standard).
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