Preparation method of ultrafine WC-Ni composite powder

The invention discloses a preparation method of ultrafine WC-Ni composite powder and belongs to the technical field of preparation of hard alloy materials. Violet tungsten oxide, nickel oxide and carbon black are used as raw materials, a nanoscale initial mixture with all phases dispersed evenly is obtained through stirring, grinding and refining firstly and then is placed in a vacuum furnace for in-situ reduction and carbonization reaction, and the WC-Ni composite powder in the ultrafine particle size is synthetized in one step. The metal oxide is high in brittleness, the raw materials can be refined and evenly mixed through ball milling for a short time, and the energy barrier for production of WC through continuous carbonization of W produced through reduction of the violet tungsten oxide is effectively reduced through formation of an intermediate product W-Ni-C in the in-situ reaction process, so that the synthetic temperature of WC and Ni is substantially reduced. Thus, compared with a traditional method