Sintering of Diamond-Tungsten Carbide Composite under High Pressure and High Temperature

With small amount of TiH2 and other elements as the cement, a high quality diamond-tungsten carbide composite has been sintered at high pressure and high temperature with DS-029A type cubic press. In the experiment, dehydrogenation of TiH2 and purification of diamond powder were carried out simultaneously at high vacuum and high temperature to get active Ti with stronger compendiousness to sinter diamond powder as well as diamond powder-tungsten carbide base. The relations between abrasive resistance and microstructure of the composite and between abrasive resistance and experimental conditions were investigated in detail. The thermostability of the composite was measured. Results show that the abrasive resistance of the composite changes little with temperature up to 850 ℃.