Tribological Properties of QSn6.5-0.1 Alloy Coated with AgCu Composite Films

AgCu composite films were deposited onto QSn6.50.1 alloy by ionplating. The tribological properties of specimens in vacuum (10-2Pa) were investigated using ballondisc friction and wear tester sliding against 9Cr18 steel ball. The SEM, EDS, XRD were used to analyze the wear tracks and the films. The results showed that QSn6.50.1 specimen coated with AgCu films exhibited better tribological performance than that of uncoated specimen. The AgCu coated QSn6.50.1 specimen maintained friction coefficient of 0.23, whereas the uncoated QSn6.50.1 showed friction coefficient of 0.86. It is found that AgCu transfer films formed on friction pair 9Cr18 ball when it slided against the AgCu coated QSn6.50.1 specimen. Surface analyses also prove that Sn element in QSn6.50.1 substrate contributed to the formation of AgCu transfer films. As a result friction occurred with AgCu transfer film against AgCu coated film, and a low friction coefficient was achieved due to easy shear of soft metals.