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The present study is focused on the evaluation of the tribological performance of novel Ni/hBN and Ni/WS2 composite coatings electrodeposited from an additive-free Watts bath with the assistance of ultrasound. Lubricated and non-lubricated scratch tests were performed on both novel composite coatings and on standard Ni deposits used as a benchmark coating to have an initial idea of the effect of the presence of particles within the Ni matrix. Under lubricated conditions, the performance of the Ni/hBN composite coating was very similar to the benchmark Ni coating, whereas the Ni/WS2 behaved quite differently, as the latter did not only show a lower coefficient of friction, but also prevented the occurrence of stick-slip motion that was clearly observed in the other coatings. Under non-lubricated conditions, whereas the tribological performance of the Ni/hBN composite coating was again very similar to that of the benchmark Ni coating, the Ni/WS2 composite coatings again showed a remarkable enhancement, as the incorporation of the WS2 particles into the Ni coating not only resulted in a lower coefficient of friction, but also in the prevention of coating failure.


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Tribological performance of novel nickel-based composite coatings with lubricant particles

Show Author's information Ignacio TUDELA1( )Andrew J. COBLEY2Yi ZHANG1( )
Daido Metal Co., Ltd. European Technical Centre UK, Research & Development Department, Winterhay lane, Ilminster TA19 9PH, United Kingdom
Functional Materials Research, Centre for Manufacturing and Materials Engineering, Faculty of Engineering, Environment and Computing, Coventry University, Priory Street, Coventry CV1 5FB, United Kingdom

Abstract

The present study is focused on the evaluation of the tribological performance of novel Ni/hBN and Ni/WS2 composite coatings electrodeposited from an additive-free Watts bath with the assistance of ultrasound. Lubricated and non-lubricated scratch tests were performed on both novel composite coatings and on standard Ni deposits used as a benchmark coating to have an initial idea of the effect of the presence of particles within the Ni matrix. Under lubricated conditions, the performance of the Ni/hBN composite coating was very similar to the benchmark Ni coating, whereas the Ni/WS2 behaved quite differently, as the latter did not only show a lower coefficient of friction, but also prevented the occurrence of stick-slip motion that was clearly observed in the other coatings. Under non-lubricated conditions, whereas the tribological performance of the Ni/hBN composite coating was again very similar to that of the benchmark Ni coating, the Ni/WS2 composite coatings again showed a remarkable enhancement, as the incorporation of the WS2 particles into the Ni coating not only resulted in a lower coefficient of friction, but also in the prevention of coating failure.

Keywords: tribology, solid lubricant, nickel, hexagonal boron nitride, tungsten disulphide, composite coatings

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Publication history

Received: 13 August 2017
Revised: 28 November 2017
Accepted: 06 February 2017
Published: 28 July 2018
Issue date: April 2019

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© The author(s) 2018

Acknowledgements

The authors acknowledge TSB (now Innovate UK) and EPSRC in UK for their funding through the KTP scheme. The authors would also like to thank Dr James Bowen (Open University) for his assistance with white light interferometry analysis performed at the University of Birmingham.

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