纳米Cu添加剂润滑摩擦表面分析

利用T-11摩擦磨损实验机进行了用纳米铜添加剂润滑的摩擦磨损实验,利用光学显微镜和扫描电镜对摩擦表面进行了形貌分析,利用能谱仪进行了磨痕表面元素分析.结果表明,磨痕表面形成了富含Cu元素的表面膜,静止上试样的磨痕表面比运动的下试样表面形成的薄膜厚,在摩擦表面有原始微损伤(磨削沟槽)的部位边缘有明显的Cu元素沉积,而在沟槽的底部没有Cu元素.分析认为摩擦使得表面金属活化,不断产生新鲜金属表面,有利于润滑剂中的纳米Cu与金属结合形成表面膜.

Analysis of Friction Surface Lubricated with Nano-Cu Additive

The wear test was carried out on a T-11 ball-on-plate friction and wear tester made in Poland. The material of the upper sample is GCr15 and the counterpart is AISI-1045 steel. The morphologies of the worn surfaces of the samples were observed on optical microscope and scanning electron microscope, while the elemental distributions on the worn surfaces were determined by means of electron microprobe analysis. As the results, a film mainly made of Cu was formed on the worn surface. The film on the surface of the still upper sample was thicker than the film formed on the revolving counterpart. At the edge of the groove of the worn surface made by the milling before test,Cu element was observed obviously, but there was no any Cu element in the bottom of the groove. A possible action mechanism of the film was suggested. The friction movement could induce reactivity of the metal and continuously produced activation surface. It benefited formation of the film formed by nano-Cu in lubricant on the worn surface.