Investigations of the superlubricity of sapphire against ruby under phosphoric acid lubrication

Jinjin LI; Chenhui ZHANG; Mingming DENG; Jianbin LUO

doi:10.1007/s40544-014-0050-6

Friction 2014, 2(2): 164-172 https://doi.org/10.1007/s40544-014-0050-6

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Open Access | Issue | Published: 03 June 2014

Investigations of the superlubricity of sapphire against ruby under phosphoric acid lubrication

Show Author's Information Hide Author's Information Jinjin LI^¹, Chenhui ZHANG^{¹^,²}, Mingming DENG^¹, Jianbin LUO^¹(

)

1 State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China

2 Shenzhen Key Laboratory of Micro-Nano Manufacturing, Research Institute of Tsinghua University in Shenzhen, Shenzhen, 518057, China

Keywords:

friction, superlubricity, aqueous lubrication, sapphire

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LI J, ZHANG C, DENG M, et al. Investigations of the superlubricity of sapphire against ruby under phosphoric acid lubrication. Friction, 2014, 2(2): 164-172. https://doi.org/10.1007/s40544-014-0050-6

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Abstract

In this study, we address the superlubricity behavior of sapphire against ruby (or sapphire against itself) under phosphoric acid solution lubrication. An ultra-low friction coefficient of 0.004 was obtained under a very high contact pressure, with a virgin contact pressure up to 2.57 GPa. Related experiments have indicated that the load, sliding speed, and humidity of the test environment can affect superlubricity to some degree, so we tested variations in these conditions. When superlubricity appears in this study a thin film is present, consisting of a hydrogen bond network of phosphoric acid and water molecules adsorbed on the two friction surfaces, which accounts for the ultra-low friction. Most significantly, the wear rate of the sapphire and ruby in the friction process is very slow and the superlubricity state is very stable, providing favorable conditions for future technological applications.

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Investigations of the superlubricity of sapphire against ruby under phosphoric acid lubrication

Show Author's information Hide Author's Information Jinjin LI^¹, Chenhui ZHANG^{¹^,²}, Mingming DENG^¹, Jianbin LUO^¹(

)

1 State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China

2 Shenzhen Key Laboratory of Micro-Nano Manufacturing, Research Institute of Tsinghua University in Shenzhen, Shenzhen, 518057, China

Abstract

Keywords: friction, superlubricity, aqueous lubrication, sapphire

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Acknowledgements

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Publication history

Received: 11 March 2014

Revised: 03 April 2014

Accepted: 22 April 2014

Published: 03 June 2014

Issue date: June 2014

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Acknowledgements

The work is financially supported by the National Key Basic Research and Development Program (973) of China (2013CB934200), Foundation for the Supervisor of Beijing Excellent Doctoral Dissertation (20111000305), the National Natural Science Foundation of China (NSFC) (Nos. 51321092, 51027007).

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