CKS活塞环表面微织构几何形貌及排布方式对摩擦学性能的影响

Effect of Geometrical Morphology and Arrangement of Micro-texture on Friction Property of CKS Piston Ring

以CKS(铬基陶瓷复合镀)活塞环-硼磷合金铸铁气缸套摩擦副为对象,采用Nd-YAG激光器在CKS活塞环上进行微织构化处理,在对置往复式摩擦磨损试验机上进行摩擦学试验,研究激光微织构几何形貌及排布方式对摩擦副减摩耐磨的作用。采用激光共聚焦扫描显微镜利用台阶法测量磨损量,采用扫描电子显微镜观察样品表面磨损形貌。发现当织构深度30μm、直径130μm、排布角度0°、面积占有率5%时,摩擦副获得最佳的摩擦磨损性能,摩擦因数最低可达0.086,与未织构化的摩擦配副相比,摩擦因数降低约0.013,降低约13%;活塞环磨损率下降约41%,气缸套磨损率下降约46%。活塞环表面微织构可改善摩擦磨损性能的作用机制为,微织构具有储存润滑油、收集磨屑以及减小摩擦副接触面积的作用。

The micro-textures with different geometric morphologies and arrangement modes were produced on the surface of piston rings by Nd-YAG laser to modify the friction and wear property of the CKS(Chromium based ceramic composite plating)piston ringcast iron cylinder liner friction pair.The friction and wear test was carried on a reciprocating friction and wear tester.The wear loss of the friction pair was measured by bench method on a OLS 4000 type laser confocal scanning microscopy and wear morphologies of the specimen were observed by a SUPRA 55 type scanning electron microscope(SEM).The optimum friction and wear properties were obtained on the textured CKS piston ring with texture parameters of 30μm depth,130μm diameter,arrangement angle of 0°and area density of 5%.Compared with the un-textured friction pair,the optimal pair has a reduced friction coefficient of about 0.013,and the wear rates of the piston ring and cylinder liner were reduced by about 41%and 46%,respectively.The surface texture can store lubricating oil,collect abrasive particles and change the contact surface area,which are responsible for the modification of the friction and wear performance of the piston ring-cylinder liner.