| abstract |
PURPOSE:To improve wear resistance by constituting either of relatively sliding members of a silicon-nitride whisker- and grain-reinforced metallic composite material and also by constituting the other of cast iron. CONSTITUTION:In these mutually abutting and relatively sliding members, mutual sliding surface parts are formed of the prescribed composite material and cast iron, respectively. In the above composite material, >=1vol% mixture of silicon-nitride whiskers and silicon-nitride grains is used as reinforcement, and a metal selected from Al, Mg, Sn, Cu, Pb, Zn, and alloys composed principally of the above elements is used as matrix. Further, a part of the above reinforcement has an echinoid shape and also has <=220mu diameter as a whole. |