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Tribological properties of DLC coatings with varying Cr concentration in water lubrication

Tribological properties of DLC coatings with varying Cr concentration in water lubrication
Tribological properties of DLC coatings with varying Cr concentration in water lubrication
Hydrogen-free amorphous carbon (a-C) coatings with five Cr contents were synthesized by unbalance magnetron sputtering aiming to evaluate the influence of Cr contents on microstructure, mechanical and water-lubricated tribological properties sliding against ceramic balls, and subsequently located the range of optimum deposition parameters and determined material of counterparts. The Cr atomic percentage exhibited upward tendency from 3at.% to 14.09at.% as the Cr target current increased from 0.5A to 2A. The incorporation of Cr enhanced the hydrophobicity, but decreased the hardness of a-C coatings. The Cr content of 4.9at.% was a critical value which determined the microstructure and tribological properties of Cr/a-C coatings. Below this value, the Cr/a-C coatings exhibited similar microstructure and friction behavior with pure a-C coatings. However, above this value, the Cr/a-C coatings exhibited obvious Cr-C bonds and confronted higher friction coefficient (0.675 for Al2O3, 0.868 for Si3N4) and specific wear rate(~10-5mm3/Nm). The SiC as counter-balls displayed lower friction coefficient and specific wear rate compared to other material balls.
Wang, Qianzhi
696b2954-9bbe-4e19-a9d2-22435e55d9b4
Zhou, Fei
aaf54725-aefa-4df9-a69c-07b3f60060fc
Zhou, Zhifeng
fb070de3-bcb2-4923-9c60-e76b61f89f5f
Ding, Xiangdong
cdaeff6e-127e-460d-a1bf-afba3582daab
Wang, Chundong
4a326956-38ca-4bc9-9077-03904b950e27
Zhang, Wenjun
5fec7a3f-8b30-4f58-86ea-f75b82efdda0
Li, Lawrence Kwok-Yan
1be013ff-b4b7-4479-a8b6-08a515c967e6
Wang, Qianzhi
696b2954-9bbe-4e19-a9d2-22435e55d9b4
Zhou, Fei
aaf54725-aefa-4df9-a69c-07b3f60060fc
Zhou, Zhifeng
fb070de3-bcb2-4923-9c60-e76b61f89f5f
Ding, Xiangdong
cdaeff6e-127e-460d-a1bf-afba3582daab
Wang, Chundong
4a326956-38ca-4bc9-9077-03904b950e27
Zhang, Wenjun
5fec7a3f-8b30-4f58-86ea-f75b82efdda0
Li, Lawrence Kwok-Yan
1be013ff-b4b7-4479-a8b6-08a515c967e6

Wang, Qianzhi, Zhou, Fei, Zhou, Zhifeng, Ding, Xiangdong, Wang, Chundong, Zhang, Wenjun and Li, Lawrence Kwok-Yan (2012) Tribological properties of DLC coatings with varying Cr concentration in water lubrication. The 6th International Conference on Technological Advances of Thin Films & Surface Coatings, Singapore, Singapore. 13 - 16 Jul 2012.

Record type: Conference or Workshop Item (Other)

Abstract

Hydrogen-free amorphous carbon (a-C) coatings with five Cr contents were synthesized by unbalance magnetron sputtering aiming to evaluate the influence of Cr contents on microstructure, mechanical and water-lubricated tribological properties sliding against ceramic balls, and subsequently located the range of optimum deposition parameters and determined material of counterparts. The Cr atomic percentage exhibited upward tendency from 3at.% to 14.09at.% as the Cr target current increased from 0.5A to 2A. The incorporation of Cr enhanced the hydrophobicity, but decreased the hardness of a-C coatings. The Cr content of 4.9at.% was a critical value which determined the microstructure and tribological properties of Cr/a-C coatings. Below this value, the Cr/a-C coatings exhibited similar microstructure and friction behavior with pure a-C coatings. However, above this value, the Cr/a-C coatings exhibited obvious Cr-C bonds and confronted higher friction coefficient (0.675 for Al2O3, 0.868 for Si3N4) and specific wear rate(~10-5mm3/Nm). The SiC as counter-balls displayed lower friction coefficient and specific wear rate compared to other material balls.

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More information

Published date: 17 July 2012
Venue - Dates: The 6th International Conference on Technological Advances of Thin Films & Surface Coatings, Singapore, Singapore, 2012-07-13 - 2012-07-16
Organisations: nCATS Group

Identifiers

Local EPrints ID: 377179
URI: http://eprints.soton.ac.uk/id/eprint/377179
PURE UUID: e052d12a-55b6-4d4e-92aa-21c8188f66d8

Catalogue record

Date deposited: 16 Jun 2015 13:37
Last modified: 11 Dec 2021 06:39

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Contributors

Author: Qianzhi Wang
Author: Fei Zhou
Author: Zhifeng Zhou
Author: Xiangdong Ding
Author: Chundong Wang
Author: Wenjun Zhang
Author: Lawrence Kwok-Yan Li

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