活塞与活塞环表面稀土自润滑摩擦学改性研究

Tribological Surface Modification of Piston and Rings by Rare Earth Self-lubrication Process

采用稀土自润滑表面处理技术对桑塔纳 JV汽油发动机活塞与活塞环表面进行处理 ,并对原机进行活塞与汽缸、活塞环端口的超小间隙改造 (配缸间隙 - 5～ 2μm,活塞环开口 15 0μm ) ,通过台架试验对超小间隙发动机抗拉缸性能和摩擦功耗进行了考察 ;通过原子力显微镜对活塞表面的微观形貌和摩擦力进行了测试 .结果表明 :经稀土自润滑处理后活塞与活塞环表面产生大量孔穴和大量直径为 6 0～ 12 0 nm的球形聚集物 ,该特征表面明显增强了活塞与活塞环的抗拉缸性能 ,降低了自润滑表面的摩擦力 。

The surfaces of piston and rings of SANTAN JV gasoline engine were tribologically modified by means of rare earth self-lubrication, and the clearances of the piston skirt to cylinder and ring gaps were modified to -5-2 μm and 150 μm, respectively. The anti-scuffing performance and friction-induced power loss of the modified engine with an ultra-small clearance were examined by means of bench tests. The morphology and friction force of the modified piston skirt were investigated with an atomic force microscope. As the results, a large number of cavities and accumulated nano-spheres were generated on the surface of the piston after rare-earth- self-lubrication process, which was beneficial to improving the anti-scuffing performance and reducing the friction-induced power loss of the engine. Thus the surface modification of the piston and rings by means of rare earths self-lubrication could find promising application in the tribological surface modification of piston and rings.