不同抛光工艺对涂层形貌及其摩擦磨损性能的影响

The Effect of Different Polishing Processes on Coating Morphology and Friction-wear Properties

该文揭示了不同抛光工艺对涂层表面形貌及涂层与密封间摩擦匹配性能影响规律。分别利用不同目数的膜基砂带和布基砂带,对等离子喷涂Cr;O;-TiO;陶瓷涂层进行抛光处理,采用粗糙度仪、三维光学显微镜分析了不同抛光工艺下涂层表面轮廓特征,以摩擦系数和磨损失重量分析了不同抛光工艺下涂层与密封间摩擦匹配性能。结果表明,涂层表面质量与砂带表面平整性及磨粒粒度正相关,抛光次数的增加有利于降低涂层轮廓的最大高度Rz和轮廓支承长度率Mr-40%,进而改善涂层与密封间的摩擦匹配性能。但是,随着抛光次数的增加,当涂层表面光洁度达到一定极限后,表面轮廓不利于油膜形成,摩擦系数反而上升。

In this paper, the effects of different polishing processes on the surface morphology of coating and the friction matching performance between coating and seal were revealed. The plasma-sprayed Cr;O;-Tio;ceramic coating was polished with different mesh sand bands and cloth sand bands. The surface profile characteristics of the coating under different polishing processes were analyzed by 3 d optical microscope, and the friction matching performance between the coating and the seal under different polishing processes was analyzed by friction coefficient and wear loss weight. The results show that the surface quality of the coating is positively correlated with the surface smoothness and abrasive grain size of the sand belt. The increase of polishing times is beneficial to reduce the maximum height Rz of the coating contour and the support length ratio Mr-40%, and then improve the friction matching performance between the coating and the seal. However, with the increase of polishing times, when the finish of the coating reaches a certain limit, the surface profile is not conducive to the formation of oil film, and the friction coefficient increases.