Effect of VC/Cr_3C_2 additions on microstructure and mechanical properties of WC-16TiC-xTaC-10Co Ultrafine Cemented Carbides

摘要

In this paper, the WC-16TiC-xTaC-10Co mixture mixed by WC 0.52μm, (W, Ti, Ta)C 2.9μm and Co1.36μm and prepared by high-energy ball milling, changed the VC and Cr_3C_2 adding amount. After ball milling for 60 hours, an average particle size of 220nm powder was prepared and it was cold isostatic pressed at 300MPa and vacuum sintered at 1410°C. The physical properties and the micrographs of samples were detected. The main conclusions are as follow: the coercivity and hardness increase and Cobalt magnetic decreases with the content of Cr_3C_2 increasing, the transverse rupture strength (TRS) does not vary. The VC and Cr_3C_2 inhibit the growth of WC grain, but can't inhibite the (W, Ti, Ta)C grain growth effectively.