Abstract
The effect of Ba0.25Sr0.75SO4 on tribological properties of the Fe3Al-based composites were evaluated both in vacuum and air. The tribological properties of the composites were significantly improved by the addition of Ba0.25Sr0.75SO4, especially in vacuum. The Fe3Al alloy shows relative poor tribological performance in vacuum than in air. The main reason was the severe adhesion wear and deleterious contact surfaces in vacuum, but in air, the formation of the oxides film on the friction surface protected the Fe3Al alloy materials from wear. It is worth noting that the wear rate of the 30% self-lubricating composite reduced almost 3–7 times than that of Fe3Al alloy in vacuum, and the COF also lowered to about 2 times. The improvement of tribological properties of Fe3Al-based composites was attributed to that the Ba0.25Sr0.75SO4 was easily softened and formed lubricating film on the worn surfaces to effectively reduce friction and wear in vacuum. The dominant wear mechanism for Fe3Al alloy was surface fatigue wear and oxidative wear in air, but in vacuum was adhesive wear and plastic deformation. For Fe3Al-Ba0.25Sr0.75SO4 composites, mainly wear mechanism was adhesive wear and surface fatigue wear in air, while in vacuum that was abrasive wear and adhesive wear.
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