EFFECT OF CONTACT TIME, SLIDING SPEED AND NORMAL PRESSURE ON FRICTION OF AL-SI-MG-FE ALLOY

Abstract

The wear characteristics of the Al-Si-Mg-Fe alloy depend upon material morphology such as composition, size, shape and distribution of micro constituents and the effect of  normal pressure,  contact time and  speed on sliding friction coefficient was evaluated using a pin-on-disc wear testing machine. The conventional melting and casting procedures for AL-Si-Mg Fe alloys result in massive nonmetallic precipitates and consequent casting defects causing deterioration of strength and toughness. Solution treated Al-Si-Mg-Fe alloys as a tribological component in recent years, has been expanding widely in aeronautical, automobile and general industries. Depending upon the applications, these alloys should be sand cast, investment cast and die cast. Experiments showed that the contact time, normal pressure and sliding speed affect the frictional force. The results conclude that the frictional force decreases with increasing of sliding speed for all the specimens. The fictional forces increase with increase in normal pressure. And also frictional force increases with increase in contact time upto 30 min and then decreases with further increase in the contact time.