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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.


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

Show Author's information Jinming ZHEN1,2Jun CHENG2( )Hui TAN2Qichun SUN2Shengyu ZHU2Jun YANG2( )Weimin LIU2
College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

Abstract

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.

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

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Publication history

Received: 03 January 2020
Revised: 11 March 2020
Accepted: 15 March 2020
Published: 01 September 2020
Issue date: October 2021

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© The author(s) 2020

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51675510 and 51975558) and the Open Foundation for the State Key Laboratory of Solid Lubrication (No. LSL-1808).

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