Reactive sintering study of a novel cemented carbide hard alloy (W 0.5Al 0.5)C 0.5–Ni

Abstract

Cemented carbides hard alloy (W 0.5Al 0.5)C 0.5–13.3 vol% Ni was successfully prepared by reactive sintering of carbon, nickel powder and W 0.5Al 0.5 alloy powder. The novel cemented carbide hard alloy has superior mechanical properties. The influence of sintering time and temperature on the microstructure, mechanical properties and density of the specimens are well described. Interestingly, both sintering time and temperature have amazing influence on the mechanical properties, density and microstructure of the specimen. During the reactive sintering process, Ni was the binder phase for sintering (W 0.5Al 0.5)C 0.5–Ni cemented carbide, and it also accelerated the reaction rate of synthesizing (W 0.5Al 0.5)C 0.5. The reactive sintering is a good method for preparing cemented carbide hard alloy (W 0.5Al 0.5)C 0.5–Ni. Another phenomenon is that no WNi/W 3Ni 3C/NiC x type phases are found in the bulk specimens, although it was prepared by reactive sintering the carbon, nickel powder and W 0.5Al 0.5 alloy powder directly and the carbon vacancy reach to the astonished 50% value.