| 摘要 |
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 a nitrided steel having the prescribed hardness. CONSTITUTION:In the mutually abutting and relatively sliding sliding members, mutual sliding surface parts are formed of the prescribed composite material and the nitrided steel having a hardness Hv(50g) of >=550, 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, Zr, and alloys composed principally of the above elements is also used as matrix. Further, a part of the above reinforcement has an echinoid shape and has a diameter as a whole of <=220mu. |
