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Nanodiamond particles (NDPs) have been considered as a potential lubricant additive to various tribological applications, such as water lubrication systems. In this study, the tribological properties of silicon carbide (SiC) lubricated by NDPs dispersed in water are investigated utilizing the ball-on-disk tribometer. It is found that the slight addition of NDP to water (i.e., 0.001 wt%) can distinctly accelerate the running-in process, which is necessary to achieve a friction coefficient (μ) as low as 0.01. This study also discusses two NDP functional terminations—hydroxyl and carboxyl. It is demonstrated that the use of carboxyl-terminated NDP over a wide range of concentration (0.001-1 wt%) yields a low friction force. In contrast, the ideal effective concentration of hydroxyl-terminated NDP is considerably limited because agglomeration in this material is more probable to occur than in the former. Meanwhile, when utilizing NDPs, the input friction energy ( Pin, defined as the product of sliding speed and applied load) is found to have an essential function. Several sliding tests were implemented at various Pin values (50-1,500 mW) using carboxyl-terminated water-dispersed NDPs. It was observed that the μ and wear decreased with increasing Pin when 200 mW < Pin < 1,500 mW. However, when Pin < 200 mW, low friction with high wear occurs compared with the resulting friction and wear when pure water is used.


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Low friction in self-mated silicon carbide tribosystem using nanodiamond as lubricating additive in water

Show Author's information Xudong WANG1,2Hirotsuna SATO2,3Koshi ADACHI2( )
Université Paris-Saclay, UVSQ, LISV, Vélizy-Villacoublay 78124, France
Department of Mechanical Systems Engineering, Graduate School of Engineering, Tohoku University, 6-6-01, Aramaki-aza-Aoba, Aoba-ku, Sendai 980-8579, Japan
Hino Motors, Ltd., 3-1-1, Hino-dai, Hino-shi, Tokyo 191-8660, Japan

Abstract

Nanodiamond particles (NDPs) have been considered as a potential lubricant additive to various tribological applications, such as water lubrication systems. In this study, the tribological properties of silicon carbide (SiC) lubricated by NDPs dispersed in water are investigated utilizing the ball-on-disk tribometer. It is found that the slight addition of NDP to water (i.e., 0.001 wt%) can distinctly accelerate the running-in process, which is necessary to achieve a friction coefficient (μ) as low as 0.01. This study also discusses two NDP functional terminations—hydroxyl and carboxyl. It is demonstrated that the use of carboxyl-terminated NDP over a wide range of concentration (0.001-1 wt%) yields a low friction force. In contrast, the ideal effective concentration of hydroxyl-terminated NDP is considerably limited because agglomeration in this material is more probable to occur than in the former. Meanwhile, when utilizing NDPs, the input friction energy ( Pin, defined as the product of sliding speed and applied load) is found to have an essential function. Several sliding tests were implemented at various Pin values (50-1,500 mW) using carboxyl-terminated water-dispersed NDPs. It was observed that the μ and wear decreased with increasing Pin when 200 mW < Pin < 1,500 mW. However, when Pin < 200 mW, low friction with high wear occurs compared with the resulting friction and wear when pure water is used.

Keywords: lubrication, running-in, silicon carbide (SiC), nanodiamond particle, termination groups, driving energy

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Publication history

Received: 27 February 2020
Revised: 18 May 2020
Accepted: 28 June 2020
Published: 29 September 2020
Issue date: June 2021

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© The author(s) 2020

Acknowledgements

The authors would like to express sincerely thanks to the Daicel Corporation for providing nanodiamond, and Mr. Norihiro Kimoto from Daicel Corporation for his valuable discussion.

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