Patent ID: 8679400

Claim:
A method for producing a ferrous sintered sliding material containing copper in an amount of 5 wt % to 50 wt % and C in an amount of 1 wt % to 15 wt % comprising: preparing a first powder which is one of a ferrous alloy powder of Fe—Cu based alloy powder containing copper in an amount of 5 wt % to less than 50 wt % and Fe—Cu—C based alloy powder containing copper in an amount of 5 wt % to less than 50 wt % and C in an amount of larger than 0 wt % to 5 wt %, a second powder which is a graphite powder, and a third powder which is WS 2 powder coated with graphite based material; mixing the prepared powders; compacting the mixed powder to form a compact; and sintering the compact, wherein a total content of said second powder and said third powder is 1 wt % to 14 wt % of said mixed powder.