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To compare the merits of Ni and Cu, the mechanical and tribological properties of CrBN coatings modified by Ni or Cu incorporation were studied. The results demonstrated that the CrBN-Cu coatings presented a lower friction coefficient than CrBN and CrBN-Ni coatings owing to the improved lubrication effect of the CuO layer originating from the tribochemical reaction. However, the hardness decline due to Cu incorporation was much greater than that of Ni incorporation. Thus, the CrBN-Cu coatings exhibited a higher wear rate than the CrBN coating. In contrast, the plastic deformation enhancement induced by Ni incorporation exceeded the hardness decline. Therefore, the wear of CrBN-Ni coatings partially turned to plastic deformation to present a lower wear rate than that of the CrBN coating.


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Comparison of mechanical and tribological properties of CrBN coatings modified by Ni or Cu incorporation

Show Author's information Qianzhi WANG1( )Xuxin JIN2Fei ZHOU1,2,3
National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Abstract

To compare the merits of Ni and Cu, the mechanical and tribological properties of CrBN coatings modified by Ni or Cu incorporation were studied. The results demonstrated that the CrBN-Cu coatings presented a lower friction coefficient than CrBN and CrBN-Ni coatings owing to the improved lubrication effect of the CuO layer originating from the tribochemical reaction. However, the hardness decline due to Cu incorporation was much greater than that of Ni incorporation. Thus, the CrBN-Cu coatings exhibited a higher wear rate than the CrBN coating. In contrast, the plastic deformation enhancement induced by Ni incorporation exceeded the hardness decline. Therefore, the wear of CrBN-Ni coatings partially turned to plastic deformation to present a lower wear rate than that of the CrBN coating.

Keywords:

CrBN coatings, friction, lubrication effect, wear, transmission component
Received: 31 July 2020 Revised: 05 October 2020 Accepted: 22 November 2020 Published: 05 April 2022 Issue date: April 2022
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Publication history

Received: 31 July 2020
Revised: 05 October 2020
Accepted: 22 November 2020
Published: 05 April 2022
Issue date: April 2022

Copyright

© The author(s) 2020

Acknowledgements

This work has been financially supported by the National Natural Science Foundation of China (Grant No. 51705245), Natural Science Foundation of Jiangsu Province (Grant No. BK20170794), and National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics (Grant No. HTL-A-20G06).

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