Effect of Mo Addition on Microstructure and Properties of WC-Ni Cemented Carbides
The effects of different Mo additions on the WC grain size,hardness,friction and wear,and corrosion resistance of WC-Ni-Mo cemented carbide were investigated by means of X-ray diffraction(XRD),scanning electron microscopy(SEM),and property detection.The results indicate that the average grain size of WC remains basically unchanged within the studied composition range(w(Mo)=1.5%～2.0%)as the Mo addition changes.The hardness of WC-Ni-Mo cemented carbide slightly decreases with the increase in Mo addition,while the friction and wear resistance is improved.The corrosion resistance of WC-Ni-Mo cemented carbide with 2%Mo addition is higher than that of WC-Ni-Mo cemented carbide with 1.5%Mo addition in acid solution,and its electrochemical stability is more favorable.In general,the comprehensive performance of WC-8%Ni-2%Mo alloy is preferable to that of WC-8.5%Ni-1.5%Mo cemented carbide.
WC-Nicemented carbideMo additiongrain size distributionfriction and wearcorrosion resistance
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