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In the present work, two types of novel nano additives, titanium sulfonate ligand/black phosphorus (TiL4/BP) and titanium dioxide/black phosphorus (TiO2/BP) nanocomposites, were prepared. The tribological behavior of the steel/steel friction pairs lubricated by polyalphaolefins type 6 (PAO6) containing the nanocomposites under boundary lubrication was studied. The worn surfaces were analyzed using modern surface techniques. The experimental results show that the rubbed surfaces became smooth and showed little wear with the addition of the nanocomposites. TiO2/BP nanocomposites can significantly improve the lubricity of BP nanosheets under high contact stress. The synergistic roles of the load-bearing abilities and rolling effect of TiO2 nanoparticles, the slip induced by the BP with its layered structure, and the establishment of a tribofilm on the sliding interface are the basis of the tribological mechanisms.


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Surface characterization of steel/steel contact lubricated by PAO6 with novel black phosphorus nanocomposites

Show Author's information Zhiheng LUO1Jingyuan YU1Yufu XU1( )He XI1Gang CHENG1Lulu YAO2Ruhong SONG1Karl D DEARN3
Institute of Tribology, School of Mechanical Engineering, Hefei University of Technology, Hefei 230009, China
School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
Mason Institute of Tribology, School of Engineering, University of Birmingham, Edgbaston, Birmingham B152TT, United Kingdom

Abstract

In the present work, two types of novel nano additives, titanium sulfonate ligand/black phosphorus (TiL4/BP) and titanium dioxide/black phosphorus (TiO2/BP) nanocomposites, were prepared. The tribological behavior of the steel/steel friction pairs lubricated by polyalphaolefins type 6 (PAO6) containing the nanocomposites under boundary lubrication was studied. The worn surfaces were analyzed using modern surface techniques. The experimental results show that the rubbed surfaces became smooth and showed little wear with the addition of the nanocomposites. TiO2/BP nanocomposites can significantly improve the lubricity of BP nanosheets under high contact stress. The synergistic roles of the load-bearing abilities and rolling effect of TiO2 nanoparticles, the slip induced by the BP with its layered structure, and the establishment of a tribofilm on the sliding interface are the basis of the tribological mechanisms.

Keywords: boundary lubrication, surface characterization, black phosphorus (BP) nanosheets, nano titanium dioxide, steel/steel contact

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Publication history

Received: 01 November 2019
Revised: 02 January 2020
Accepted: 01 February 2020
Published: 04 August 2020
Issue date: August 2021

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© The author(s) 2020

Acknowledgements

The authors appreciate the financial support of the National Natural Science Foundation of China (Grant No. 51875155) and the Fundamental Research Funds for the Central Universities (Grant No. PA2019GDQT0017). In addition, professor Kunhong HU and associate professor Enzhu HU are gratefully acknowledged for providing half of the testing instruments and fruitful suggestions.

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