磨损工况对气门-气门座摩擦磨损特性的影响

The Effect of Wear Conditions on Tribological Properties of Valve-Valve Base Pairs

本文根据摩擦学原理,采用动态磨损模拟试验和表面微观分析的研究方法考察了冲击载荷、温度、燃烧气氛等磨损工况对气门-气门座摩擦磨损特性的影响,指出要改善气门-气门座的摩擦磨损特性,就必须提高材料表面层在高温下的力学性能和抗蠕变及抗腐蚀的能力。

On the basis of tribology principle the effects of friction conditions, such as impact load, temperature and combustion atmosphere etc, on the friction-wear properties of valve valve base pairs were investigated using dynamic wear simulation test and microanalysis technique of surface in this paper. The results are as follows: a. In the case of without exhause gas, the wear process of valve-valve base pairs conforms to the general laws, it is consists of three stages, i. e. running-in wear, constant wear and severe wear. b. The wear loss of valve-valve base pair increases with the increment of load. When the load achieve 1200 N, the wear rate increases sharply. c. The wear loss of valve-valve base pair increases with rising of temperature, when the tempe rature is higher than 650℃ , the wear rate increases obviously. d. Under nigh temperature and combustion atmosphere, not only happens to corrosion wear, but also occurs 'softening nest' phenomenon resulting from the metallic materials slipping, as a result the wear becomes more severe. e. The failure of contact surface between valve and valve base is mainly caused by plastic and e-lastic deformation, metal sliding of subsurface, creep sliding of materials under high temperature and fatigue peeling resulted from corrosion wear. Therefore, promoting the mechanical property, anti-creep and anti-corrosion abilities of surface layer under high temperature, is the key to improve anti-wear property of valve-valve base pairs.