INFLUENCE OF SURFACE ROUGHNESS ON MATERIAL TRANSFER OCCURRING IN ALUMINIUM DRY SLIDING APPLICATION

Abstract

Aluminium and its alloys are highly represented in industrial application. Despite of good mechanical and conductive properties, both thermal and electric, in tribological manner material transfer that may occur during the dry sliding conditions has great influence on friction and wear of the contact elements. This study represents an attempt one in a row to define the parameters that leads to the material transfer occurring, and in this paper influence of surface roughness was investigated. Tribological test were performed in dry sliding conditions using CSM nanotribometer with ball-on-plate contact configuration and linear reciprocating motion with 0,5mm amplitude and sliding speeds of 1, 5 and 10 mm/s under constant load of 200mN. Obtained results indicated presents of material transfer for all three investigated surfaces prepared using sand paper with different grit sizes 240 and 1000 and polished sample. Appearance of transferred layer, on the steel counter body, and penetration depth value plots refers to cyclic nature of material transfer. Material transfer during the dry sliding contact result in increase of coefficient of friction and wear of tested aluminium samples.