抄録
Friction properties under boundary lubrication are determined by surface characteristics. On sliding surfaces, tribofilms are produced by lubricant additives. It is essential to study mechanical properties of the tribofilms for revealing friction mechanisms or improving sliding properties. In this work, we researched mechanical properties of the tribofilms using atomic force microscopy (AFM), mezzo-friction tester we developed. The tribofilms were produced by cylinder on disk reciprocating sliding test lubricated by Poly Alpha Olefin (PAO) with Zinc Dialkyldithiophosphate (ZnDTP) or ZnDTP and Molybdenum Dialkyldithiocarbamate (MoDTC). Mezzo-friction tester was employed for observing friction behavior of the tribofilms on sliding surface. AFM was used to obtain topographic images and mechanical properties. Experimental results suggested that a lower friction layer exists on the tribofilm from ZnDTP and MoDTC, and the effect of friction reduction remained after cleaning. From AFM measurements, the properties like microscopic friction force and adhesion force are investigated.
