The invention provides a preparation method of WC-Co series nano-composite hard
alloy powder, which includes: installing the
front cover plate and
electrode rod of the
ball mill tank, and connecting the
front cover plate and
electrode rod to the two poles of the
plasma power supply respectively ; Put
grinding balls and a certain proportion of W, C, Co raw materials in the ball milling tank, and when the
electrode rod contacts the
grinding balls and W, C, Co raw materials, cover the rear cover of the ball milling tank; pass the vacuum valve Vacuum the closed
ball mill tank to 0.01-0.1Pa, or pass the
discharge gas medium through the vacuum valve until the pressure is 0.01-0.1MPa; turn on the
plasma power supply, according to the
discharge gas medium and its pressure Adjust the
discharge parameters and carry out different types of
corona discharge
plasma high-energy ball milling; take out the mixed
powder of W, C, and Co, place it in a heat source environment for synthesis reaction, and obtain the corresponding
cemented carbide. The invention can not only save energy, but also improve synthesis efficiency.