Abstract:Self-lubricating materials are particularly suitable used in the advanced mechanical motion systems with extreme conditions such as high temperature, high-speed and heavy-loading. In this paper, a high temperature self-lubricating composite, Fe₃Al with embedded Ba_0.25Sr_0.75SO₄ solid lubricant are prepared by hot-pressed sintering technique. Meanwhile, the effects of Ba_0.25Sr_0.75SO₄ fraction on microstructure, hardness and high-temperature tribological properties of the composites are investigated. The results show that the high-temperature tribological properties of the Fe₃Al alloy are greatly improved by the addition of Ba_0.25Sr_0.75SO₄, and the wear mechanism transforms from fatigue wear to abrasion wear.

Keywords: Fe₃Al based composites; Self-lubricating composites; High temperature; Friction and wear

Published in TRIBOLOGY INTERNATIONAL, 101 81-87; 10.1016/j.triboint.2016.04.011 SEP 2016