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Short Communication | Open Access

Water-based superlubricity in vacuum

Chen XIAO1, Jinjin LI2, Lei CHEN1, Chenhui ZHANG2, Ningning ZHOU3, Tao QING3, Linmao QIAN1( ), Jiyang ZHANG3, Jianbin LUO2
Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms, Beijing Institute of Control Engineering, Beijing 100094, China
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Abstract

This study achieved water-based superlubricity with the lubrication of H3PO4 solution in vacuum (highest vacuum degree <10-4 torr) for the first time by performing a pre-running process in air before running in vacuum. The stable water-based superlubricity was sustainable in vacuum (0.02 torr) for 14 h until the test was stopped by the user for non-experimental factor. A further analysis suggested that the superlubricity may be attributed to the phosphoric acid-water network formed in air, which can efficiently lock water molecules in the liquid lubricating film even in vacuum owing to the strong hydrogen bond interaction. Such capability to lock water is strongly affected by the strength of hydrogen bond and environmental conditions. The realization of water-based superlubricity with H3PO4 solution in vacuum can lead to its application in space environment.

Keywords

frictionwater-based superlubricityvacuumphosphoric acid

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Friction
Volume 7 Issue 2,
April 2019
Pages 192-198
DOI: 10.1007/s40544-018-0212-z
Cite this article:
XIAO C, LI J, CHEN L, et al. Water-based superlubricity in vacuum. Friction, 2019, 7(2): 192-198. https://doi.org/10.1007/s40544-018-0212-z

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Received: 10 September 2017
Revised: 06 November 2017
Accepted: 10 February 2018
Published: 04 April 2018
© The author(s) 2018

This article is published with open access at Springerlink.com

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