用粉末冶金方法制备Ni-Cr基自润滑复合材料,研究了固体润滑剂MoS2和石墨对复合材料的机械性能和摩擦学性能的影响.结果表明,随着MoS2含量的增加,复合材料的显微硬度明显降低;MoS2添加量从10%(质量分数,下同)增加到15%,复合材料摩擦系数和磨损率的变化并不明显.随着石墨含量的增加,复合材料的显微硬度呈逐渐降低的趋势,在400℃和800℃的摩擦系数呈升高趋势,石墨添加量为10%时室温摩擦系数最小.同时添加5%MoS2和10%石墨时,复合材料的摩擦系数保持在0.48-0.65,石墨与MoS2之间存在着协同效应,但是磨损率比添加单一润滑剂时高一个数量级.
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