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聚合物复合材料因其优异的自润滑、高化学稳定性和减振降噪等特性而备受关注。以水作为工作介质的水润滑轴承具有环境友好、维护成本低及结构设计简单等特点,已被广泛应用于船舶、水电和化工等领域。首先总结了水润滑轴承用聚合物复合材料特性,归纳了聚合物复合材料在水润滑条件下的摩擦学性能及磨损机制,介绍了提高聚合物复合材料摩擦学性能的常规方法,并进一步探讨了材料内部结构、摩擦界面微观结构与材料宏观摩擦学特性的内在关联。指出促进水润滑聚合物-金属配副摩擦界面原位生长固体润滑特性转移膜,可弥补水膜润滑能力不足、显著提高配副的摩擦学性能,深入研究水润滑状态下复合材料的微观摩擦磨损机制,对于理解水润滑配副的摩擦学机理有重要的意义。 相似文献
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Surface compositions,structures,and acidities of the Mo-Te-Fe-Ni catalysts added with La_2O_3,CeO_2,Pr_6O_(12),Nd_2O_3 and Sm_2O_3 were measured and related with the activities of the catalysts for selective oxidationof olefins.It was found that adding rare earth elements to the Mo-Te catalysts increases obviously theirselectivities to methacrolein(MAL),and the yield percentage of MAL changes periodically with the increase ofatomic numbers of rare earth elements added,and the highest yield was obtained with the catalyst containingCeO_2.The addition of CeO_2 to 9-component Mo-Te catalyst increases not only the activity of the catalyst,but also its thermostability remarkably.The mechanism of rare earth elements in the catalysts was discussed. 相似文献
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