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Research Article | Open Access

Hydrodynamic effect on the superlubricity of phosphoric acid between ceramic and sapphire

Mingming DENG1, Chenhui ZHANG1,2( ), Jinjin LI1, Liran MA1, Jianbin LUO1
State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China
Shenzhen Key Laboratory of Micro-Nano Manufacturing, Research Institute of Tsinghua University in Shenzhen, Shenzhen, 518057, China
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Abstract

In this work, a super-low friction coefficient of 0.003 was found between a silicon nitride ball and a sapphire plate lubricated by phosphoric acid solution. The wear mainly occurred in the running-in period and disappeared after superlubricity was achieved. The friction coefficient was effectively reduced from 0.3 to 0.003 at a constant speed of 0.076 m/s, accompanied by a 12-nm-thickness film. The lubrication regime was indicated to change from boundary lubrication in the running-in period to elastohydrodynamic lubrication in the superlubricity period, which is also supported by the results of the friction coefficient versus sliding speed. In addition, the experimental results showed good agreement with theoretical calculations based on the elastohydrodynamic lubrication theory, suggesting a significant hydrodynamic effect of phosphoric acid on superlubricity.

Keywords

liquid superlubricityphosphoric acidhydrodynamic lubricationfilm thickness

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Friction
Volume 2 Issue 2,
June 2014
Pages 173-181
DOI: 10.1007/s40544-014-0053-3
Cite this article:
DENG M, ZHANG C, LI J, et al. Hydrodynamic effect on the superlubricity of phosphoric acid between ceramic and sapphire. Friction, 2014, 2(2): 173-181. https://doi.org/10.1007/s40544-014-0053-3

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Received: 16 May 2014
Accepted: 26 May 2014
Published: 19 June 2014
© The author(s) 2014

This article is published with open access at Springerlink.com

Open Access: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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