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

• 作者: Jinming ZHEN Jun CHENG Hui TAN Qichun SUN Shengyu ZHU Jun YANG Weimin LIU
• 来源期刊: 摩擦（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: Research Articles
• 页码范围: 990-1001
• 页数: 12页
• 语种: 英文

摘要

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.