本文阐述活塞环等离子渗氮设备、工艺及渗氮层的检测方法。活塞环经过等离子渗氮处理 ,提高了活塞环的表面硬度 ,耐磨性好。通过磨损实验发现经等离子渗氮的试样摩擦力矩小 ,即摩擦系数小 ,减摩性好。同时磨合接触面的温度低 ,有利于活塞环在缸套中高速运动时建立润滑油膜 ,提高了活塞环的抗咬合性 ,延长了活塞环的使用寿命 This paper describes the piston ring plasma nitriding equipment, technology and nitriding layer detection method. Piston ring after plasma nitriding, improve the surface hardness of the piston ring, good wear resistance. Through the wear test found that the plasma nitriding sample friction torque is small, the friction coefficient is small, good friction reduction. At the same time running-in contact surface temperature is low, is conducive to the piston ring in the cylinder liner in the high-speed movement to establish a lubricating film, improve the anti-seizure of the piston ring, extending the life of the piston ring