HIGH CORROSION RESISTANT AND WEAR RESISTANT COMPOSITE MATERIAL

PURPOSE:To produce a composite material having excellent characteristics both in corrosion resistance and wear resistance and suitable as a cylinder, a screw or the like for resin working machines. CONSTITUTION:This composite material is the one obtd. by combining a hard phase essentially consisting of carbides and borides with an Ni-based matrix and having a compsn. contg. 2 to 6% B, 21 to 38% Cr, 8 to 22% Mo, 0.5 to 8% W, 3 to 6% Fe, 0.4 to 3% C and 0 to 2% Cu, if desired, furthermore contg. total 6 to 25% of one or more kinds among V, Zr, Nb and Ta, and the balance Ni with inevitable impurities. Thus, excellent characteristics both in corrosion resistance and wear resistance can be obtd., and excellent durability as a constituting sliding material for resin working machines used in a severe environment can be obtd.