某机用自润滑关节轴承使用390 h后内圈球面陶瓷涂层脱落，采用宏观分析、化学成分分析、扫描电镜及能谱分析等方法，对该自润滑关节轴承磨损失效的原因进行了分析。结果表明：自润滑关节轴承单边受力较大，轴承单侧磨损较为严重，受力较集中，已超出正常使用工况，导致内圈球面陶瓷涂层与外圈内球面衬垫快速磨损；此外，靠近轴承端面处的陶瓷涂层与基体的结合力较弱，易于剥落，也会导致轴承的磨损失效。

The ceramic coating fracture phenonema appeared at the inner ring spherical surface of a self-lubricating spherical plain bearing used for a machine after using for 390 h. By means of macroscopic analysis, chemical composition analysis, scanning electron microscope and energy spectrum analysis and so on, the wear reasons of the bearing was analyzed. The results show that the self-lubricating spherical plain bearing had greater stress on one side, serious wear on this side of the bearing and concentrated force, which had exceeded the normal working condition, led to rapid wear and tear of ceramic coating at the inner ring spherical surface and liner in inner spheral surface of outer ring. In addition, the adhesion between ceramic coating near the end of the bearing and substrate was weak and easy to peeling, which can also led to wear and tear failure of the bearing.