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

The W-Co compound precursor powderswith an average particle size of 60 nm were prepared by thechemical coprecipitation as the raw materials of Na_2WO_4 andCoCl_2 and as the reagents of HCl and NH_3·H_2O. After re-ducing and carburizing the precursor powders by hydrogengas and CO-Co_2 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.

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

The W -Co compound precursor powders with an average particle sife of 60 nm were prepared by the chemical coprecipitation as the raw materials of Na2WO1 and CoCl2 and as the reagents of HCI and NH3 ?H2O. After re-ducing and carburizing the precursor powders by hydrogen gas and CO-CO 2 mixture gas. the WC-Co composite povvders ivith an average particle size of 0. 18/wi can be obtained. The purity and particle size of powders -were analysed by XRD and TEM. respectively. Meanwhile, the key factors to influ-ence the reducing and carburizing process of powders were also studied.