(1. 华南师范大学 光子信息技术广东省高校重点实验室, 广州 510631;
2. 清华大学 机械工程系 激光加工研究中心, 北京 100084)
摘 要: 为降低活塞环、 缸套摩擦副的磨损和改善配副性， 采用激光熔覆和电镀技术在球墨铸铁表面分别制备原位析出颗粒增强金属基复合材料表层和镀铬层。 分别以激光熔覆和镀铬强化的球墨铸铁为上试样， 灰铸铁为下试样， 模拟活塞环和缸套的工作环境， 进行SRV快速磨损实验。 实验结果表明： 镀铬活塞环和灰铸铁缸套配副， 摩擦系数在0.117 0～0.133 2范围内变化， 且随摩擦时间的延长， 摩擦系数逐渐增加， 其磨损机制为粘着磨损； 在相同的工艺条件下， 激光熔覆强化的活塞环与灰铸铁配副， 摩擦系数在0.067～0.085范围内变化， 随摩擦时间的延长逐渐降低， 其磨损机制为微切削。
关键字: 活塞环； 原位析出； 激光熔覆； 摩擦系数； 配副性
（1. Laboratory of Photonic Information Technology,
South China Normal University, Guangzhou 510631, China;
2. The Center of Laser Processing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China）
Abstract: In order to decrease the wear of piston rings and cylinder liners, and improve partner adaptability, the laser cladding and electroplating techniques were adopted to prepare in-situ precipitation particle reinforced metal matrix composite coatings and chromium-plated coatings on the nodular cast iron matrix. By simulating the operating conditions of piston rings and cylinder liner, the optimal SRV tests were carried out using laser cladding and chromium-plated strengthening piston rings as upper samples and grey cast iron as under samples, respectively. The results show that the friction coefficient (0.117 0-0.133 2) between the chromium-plated piston rings and cast iron cylinder liners increases with the increase of wear time, and the mechanism is adhesive wear. On the other hand, the laser cladding processes reduce the wear losses of the piston ring and partner cylinder liner and have the lower friction coefficient (0.067-0.085), which reduces with the increase of wear time, and the wear mechanism is micro-cutting.
Key words: piston ring; in-situ precipitation; laser cladding; friction coefficient; partner adaptability
