Article Title

Investigation of tribological characteristics of nickel alloy-based solid-lubricating composites at elevated temperatures under vacuum


metal matrix composite, graphite, solid lubrication, vacuum, high temperature


The development of a high-performance solid-lubricating composite with excellent self-lubricity over a broad temperature range in vacuum is significant to solve the frictional problems of spatial mechanisms. In this study, the vacuum tribological behaviors of nickel-matrix/Ag/(Ca, Ba)F2/graphite (0-2 wt%) composites were studied from 25 to 800 ˚C. The results show that the synergistic effects of solid lubricants can significantly improve the tribological properties of the composites in vacuum, with the graphite content contributing considerably. For 2 wt% graphite, a low friction coefficient (0.14-0.25) and the lowest wear rate ((0.12-4.78)×10-5 mm3·N-1·m-1) were observed in vacuum over the entire testing temperature range. Moreover, the wear mechanisms were clarified via analysis of the chemical composition and morphologies of the sliding surfaces.


Tsinghua University Press