METHOD FOR PREPARING COBALT-COATED NANOMETER WC CRYSTAL COMPOSITE POWDER AND ULTRA-FINE GRAIN CEMENTED CARBIDE

摘要

A method for preparing cobalt-coated nanometer WC crystal composite powder comprises the following steps: (1) mixing raw materials with water to obtain a tungsten-cobalt composite saline solution, wherein the raw materials comprise the following components (by weight percentage), 40%-60% of violet tungsten oxide, 30%-52% of water-soluble cobalt salt, 4%-10% of carbon source, 1%-4% of PEG and 0.05%-3% of dispersant agent; (2) drying the tungsten-cobalt composite saline solution obtained in the step (1) to obtain cobalt-coated precursor powder; (3) reducing and carbonizing the cobalt-coated precursor powder obtained in the step (2) in reducing atmosphere to obtain the cobalt-coated nanometer WC crystal composite powder. The cobalt-coated nanometer WC crystal composite powder prepared by the method has stable performance, homogeneous component and fine WC grain size, and the components of the powder can be easily controlled.