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以传统固体润滑剂石墨和MoS2为基准,考察了PbO、ZnO、NiO和TiO2等氧化物粉末有限润滑下Ti3SiC2自配副在空气中从室温到800℃的摩擦系数-温度特性.结果表明:石墨和MoS2可大幅降低Ti3SiC2自配副的摩擦系数,但石墨的使用温度范围较窄且最高使用温度较低(200℃以下);MoS2使用温度虽较宽,但在500℃以上会发生氧化失效.与石墨和二硫化钼的摩擦系数相比,虽然氧化物粉末的润滑性较差,但在不同温度范围具有固体润滑作用.从室温至600℃范围内PbO粉末润滑性最好;700℃以上,TiO2和NiO具有一定减摩作用.石墨、MoS2和氧化物粉末的润滑机理与粉末的成膜性、膜的剪切和膜的化学稳定性有关.
Taking the traditional solid lubricant graphite and MoS2 as reference, the friction coefficient-temperature characteristics of Ti3SiC2 self-copier in air from room temperature to 800 ℃ under the limited lubrication of PbO, ZnO, NiO and TiO2 were investigated. The results show that graphite And MoS2 can significantly reduce the coefficient of friction of Ti3SiC2 self-auxiliary, but the use of graphite has a narrower range of service temperature and a lower maximum temperature (below 200 ℃). Although MoS2 has a wide temperature range, oxidation failure occurs above 500 ℃. Compared with the friction coefficient of graphite and molybdenum disulfide, although oxide powder has poor lubricity, it has solid lubrication in different temperature range.The PbO powder has the best lubricity from room temperature to 600 ℃, TiO2 and NiO have a certain antifriction effect.The lubricating mechanism of graphite, MoS2 and oxide powders is related to the filming property of the powder, the shearing of the film and the chemical stability of the film.