Effect of WC mass fraction on the microstructure and properties of Ti(C_0.7N_0.3) -based cermets

Ti(C_0.7N_0.3) -based cermets were prepared by low pressure sintering in powder metallurgy method. The effect of WC mass fraction on the microstructure, mechanical properties, and magnetic properties was investigated by scanning electron microscope (SEM) and energy dispersive spectrum (EDS), mechanical property test, and magnetic property test.Resultsshow that, after sintering at 1420 ℃for 1 h, there is obvious core/rim structure in the Ti(C_0.7N_0.3) -based cermets, and with the increase of WC content, the quantity and volume of black hard phase decrease and the volume of rim and binder phase increase. With the increase of WC mass fraction from 0 to 20%, the hardness increases firstly and then decreases, the bending strength increases firstly and then tends to be stable, the saturation magnetization decreases, and the coercivity increases gradually. When the WC mass fraction is 15%, the mechanical properties reach the optimum, the hardness is HRA 91.6 and the bending strength is 2160 MPa.