对发动机气门 -门座的磨损失效进行了模拟实验研究 ,基于现代微观表面测试技术和摩擦学原理对气门 -门座的磨损机理进行了探讨 .研究结果表明 :气门 -门座接触表面的磨损失效是由于反复的弹、塑变形疲劳 ,亚表层的金属滑动、基体材料在高温下的蠕变滑动和腐蚀磨损等所致 ,这种失效呈片状疲劳裂纹和剥落特征 The fatigue failure of engine valve-door seat was simulated and studied, and the wear mechanism of valve-door seat was discussed based on modern microscopic surface test technology and tribology theory.The results show that the wear of valve-door contact surface is invalid Is due to repeated bouncing, plastic deformation fatigue, subsurface metal sliding, creep and sliding wear and corrosion of the matrix material at high temperatures and other wear and tear caused by this failure was flaky fatigue crack and flaking characteristics