Abstract
Wear as a tribological process has a major influence on the reliability and life of journal bearings. The influences of Sn element doping on the microstructure and tribological properties of AlSn coatings on the surface of journal-bearing alloy were investigated by magnetron sputtering. AlSn coatings exhibit equiaxed crystals. Phase compositions transform from crystalline to amorphous as grain sizes gradually decreases with increased Sn target current. Sn mainly exists as a simple substance composed of SnSn bonds, reducing the friction coefficient of AlSn coatings sliding against a GCr15 steel ball. The hardness is 40 HV0.025, and the lowest friction coefficient of AlSn coatings was 0.15 when ISn is 0.25A. Overall, the AlSn coatings have excellent microstructure and tribological properties.
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