Abstract
This paper studies the effects of Mo, added to a plasma-sprayed Cr 3C 2-25%NiCr coating, on the anti-friction performance of the coating at temperatures up to 850 °C. 7% Mo is mixed with Cr 3C 2-25%NiCr powder for spraying the Cr 3C 2-NiCr-Mo coating. The surface of this kind of coating is found to react with additive elements in synthetic oil in the friction process when sliding against a plasma-sprayed Cr 2O 3 coating at high temperatures. The reacted surface film shows the effect of solid lubrication. Compared with the Cr 3C 2-NiCr coating, the Cr 3C 2-NiCr-Mo coating possesses much better anti-friction capability at high temperatures. Surface analysis using SEM, WDS and XPS shows that Mo plays a very important role in forming different kinds of solid lubricating films at different temperatures. The solid lubricating films formed are dominated by MoS 2 and graphite.
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