摘要： 为提高汽车发动机活塞摩擦磨损性能，设计了 ＷＳ_２／ Ｓｂ_２Ｏ_３ 混合涂料配方，采用悬浮液喷涂法在活塞表面制备一层减摩涂层。 利用 ＲＥＴＣ 多功能摩擦磨损试验机对涂层试件和未喷涂涂层试件进行摩擦系数测试。 利用有限元分析，对喷涂减摩涂层和未进行喷涂的活塞进行最大等效应力、变形和疲劳寿命对比和分析。 结果表明：有涂层活塞摩擦系数为 ０.０６，无涂层活塞的摩擦系数为 ０.１５；有涂层活塞最大等效应力比无涂层活塞减少 ３０.５４ ＭＰａ；有涂层活塞最大变形为０.０１３ ５４５ ｍｍ，无涂层活塞最大变形为０.０１５ ６２７ ｍｍ；有涂层活塞最低寿命为３５ ２６１次，无涂层活塞寿命为２００３６次。ＷＳ_２／Ｓｂ_２Ｏ_３ 涂层能有效地降低活塞摩擦系数，提高活塞工作性能和寿命。

关键词: 汽车活塞, 涂层, ＷＳ_２／ Ｓｂ_２Ｏ_３ , 摩擦, 有限元分析

Abstract:

In order to improve the anti-friction performance of automatic piston, a WS₂/ Sb₂ O₃ composite coating system has been designed and is sprayed on the surface of the pisto to form the anti-friction coating. The coated and uncoated samples are tested via RETC in terms of the friction coefficient, and comparatively analyzed via finite element analysis in terms of the maximum equivalent stress, deformation and fatigue life. The results show that the fric-tion coefficient of the coated sample is 0. 06 while the uncoated sample is 0. 15. The maximum equivalent stress of the coated sample is 30. 54 MPa lower than that of the uncoated sample.The maximum deformation of the coated sample is 0. 013 545 mm while the uncoated sample is 0.015 627 mm. The minimum life of the coated sample is 35 261 cycles while the uncoated sample is 20 036 cycles. It is indicated that the WS₂/Sb₂ O₃ composite coatings can decrease friction coefficient and improve working performances of the piston.

Key words: piston, coating, WS₂/Sb₂ O₃ dope, tribology, finite element analysis