Effects of Y2O3 and Cr3C2 on the microstructure and properties of WC–Co–Ni alloy prepared by microwave sintering

WC–9Co–1Ni cemented carbides with Y2O3 and Cr3C2 additives were obtained through powder metallurgy and microwave sintering. The effects of additives on the microstructure and properties were investigated by scanning electron microscopy, X-ray diffraction, mechanical property tests and electrochemical tests. The results showed that the grain size of WC decreased from 558 nm to 443/450 nm after adding Y2O3 or Cr3C2 additives, respectively. The hardness and transverse rupture strength of alloys were greatly enhanced when the contents of Y2O3 or Cr3C2 additives were 0.50 wt.%. Compared with the WC–9Co–1Ni cemented carbide, the wear rate of cemented carbide with 0.50 wt.% Y2O3 or Cr3C2 was reduced by 31.48% and 31.65%, respectively. Meanwhile, both Y2O3 and Cr3C2 additives could effectively improve the anti-corrosion performance of WC–9Co–1Ni cemented carbide.