STUDY ON PREPARATION OF CERAMIC MATRIX COMPOSITE OF WC-Co ULTRAFINE POWDERS

摘要

The W-Co compound precursor powderswith an average particle size of 60 nm were prepared by thechemical coprecipitation as the raw materials of Na2WO4 andCoCl2 and as the reagents of HCl and NH3·H2O. After re-ducing and carburizing the precursor powders by hydrogengas and CO-Co2 mixture gas, the WC-Co composite powderswith an Laverage particle size of 0.18μm can be obtained. Thepurity and particle size of powders were analysed by XRDand TEM. respectively. Meanwhile, the key .factors to influ-ence the reducing and carburizing process of powders werealso studied.