研究了铁道货车用新型高强度粉末冶金烧结耐磨合金衬套，并对主要添加元素Ni和Mo的作用机理进行讨论；与现用烧结铜钢衬套及27SiMn钢制衬套比较，提出替代建议。 A new type of high strength powder metallurgy sintered wear-resistant alloy bushing for railway freight cars is studied, and the mechanism of action of the main additive elements Ni and Mo is discussed. Compared with the current sintered copper bushing and 27SiMn steel bushing, alternative suggestions .