Patent ID: 6863707

Claim:
A method of forming a tungsten-coated W—Cu composite powder, comprising the steps of: mixing and pulverizing a tungsten oxide powder selected from the group consisting of WO 3 and WO 2.9 and a copper oxide powder selected from the group consisting of CuO and Cu 2 O using turbular mixing or ball milling; and carrying out a thermal reduction treatment on the mixed-pulverized oxide powders under a hydrogen atmosphere or a reducing gas environment including hydrogen, wherein the thermal reduction treatment is carried out by being maintained for 1 minute to 5 hours at 200 to 400° C., being maintained for 1 minute to five hours at 500 to 700° C., being maintained for 1 minute to 5 hours at 750 to 1080° C. and being cooled in that order.