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Macroscale superlubricity has attracted increasing attention owing to its high significance in engineering and economics. We report the superlubricity of engineering materials by the addition of partially oxidized black phosphorus (oBP) in an oleic acid (OA) oil environment. The phosphorus oxides produced by active oxidation exhibit lower friction and quick deposition performance compared to BP particles. The H-bond (–COOH···O–P, or –COOH···O=P) formed between P–O bond (or P=O) and OA molecule could benefit the lubricating state and decrease the possibility of direct contact between rough peaks. The analysis of the worn surface indicates that a three-layer tribofilm consisting of amorphous carbon, BP crystal, and phosphorus oxide forms during the friction, which replaces the shear interface from the steel/steel to carbon–oBP/carbon–oBP layer and enables macroscale superlubricity.


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Superlubricity induced by partially oxidized black phosphorus on engineering steel

Show Author's information Kai GAO1Jianguo JIAO1Zheng WANG2Guoxin XIE1( )Jianbin LUO1( )
State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
School of Engineering and Technology, China University of Geosciens (Beijing), Beijing 100083, China

Abstract

Macroscale superlubricity has attracted increasing attention owing to its high significance in engineering and economics. We report the superlubricity of engineering materials by the addition of partially oxidized black phosphorus (oBP) in an oleic acid (OA) oil environment. The phosphorus oxides produced by active oxidation exhibit lower friction and quick deposition performance compared to BP particles. The H-bond (–COOH···O–P, or –COOH···O=P) formed between P–O bond (or P=O) and OA molecule could benefit the lubricating state and decrease the possibility of direct contact between rough peaks. The analysis of the worn surface indicates that a three-layer tribofilm consisting of amorphous carbon, BP crystal, and phosphorus oxide forms during the friction, which replaces the shear interface from the steel/steel to carbon–oBP/carbon–oBP layer and enables macroscale superlubricity.

Keywords: macroscale superlubricity, black phosphorus (BP), oleic acid (OA), active oxidation

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Publication history

Received: 08 November 2021
Revised: 21 January 2022
Accepted: 01 April 2022
Published: 23 March 2023
Issue date: September 2023

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© The author(s) 2022.

Acknowledgements

This work was supported by the Beijing Natural Science Foundation (Grant No. JQ21008), the National Natural Science Foundation of China (Grant No. 52275197), and the Tsinghua–Foshan Innovation Special Fund (TFISF) (Grant No. 2020THFS0127).

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