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HOME > J Korean Powder Metall Inst > Volume 3(2); 1996 > Article
분쇄된 초경합금 분말의 산화에 미치는 진공열처리 효과
EffEct of vacuum annealing on an oxidation of milled WC-Co powder
Journal of Korean Powder Metallurgy Institute 1996;3(2):91-96

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The effect of vacuum annealing on the oxidation behavior of milled WC-15%Co powder mixture has been studied. A cobalt component in the milled powder mixture was oxidized preferentially above 175°C in air. The specimens showed a steady increase in weight at 175°C but did constant weight followed by rapid increase in specimen weight at the beginning above 200°C. Oxidation of the milled powder mixture was significantly suppressed by vacuum annealing at 300°C for 10 h. Suppression of oxidation by vacuum annealing and different oxidation behaviors of the milled powder mixture between 175°C and 200°C, were attributed to removal of strain energy stored in the cobalt powder during vacuum annealing or oxidation treatment above 200°C. The role of stored strain energy on oxidation of milled WC-15%Co powder mixture was proved by X-ray diffraction method and differential thermal analysis.

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