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Coatings 2018, 8(7), 247; https://doi.org/10.3390/coatings8070247

Structure and Properties of High-Hardness Silicide Coatings on Cemented Carbides for High Temperature Applications

1
Department of Materials, Imperial College London, Prince Consort Road, London SW7 2BP, UK
2
Sandvik Hyperion, Torrington Avenue, Coventry CV4 0XG, UK
3
Department of Physics, University of Warwick, Coventry CV4 7AL, UK
*
Author to whom correspondence should be addressed.
Received: 29 April 2018 / Revised: 8 June 2018 / Accepted: 4 July 2018 / Published: 12 July 2018
(This article belongs to the Special Issue Thermal Barrier Coatings)
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Abstract

Cemented tungsten carbides (cWCs) are routinely used in mining and manufacturing but are also candidate materials for compact radiation shielding in fusion power generation. In both applications, there is a need for oxidation to be minimized at operating temperatures. In a recent study, Si-based coatings deposited by pack cementation were demonstrated to improve the oxidation resistance of cWCs by up to a factor of 1000. In this work, these coatings are further characterized, with the focus on growth kinetics, phase composition, and hardness. By combining quantitative X-ray diffraction, electron microscopy, and instrumented micro-indentation, it is shown that the coating layer has a 20% higher hardness than the substrate, which is explained by the presence of a previously-unknown distribution of very hard SiC laths. To interpret the coating stability, a coating growth map is developed. The map shows that the structure is stable under a broad range of processing temperatures and cWC compositions, demonstrating the wide-ranging applicability of these coatings. View Full-Text
Keywords: cemented carbides; cermets; iron binders; radiation shielding; micro-indentation; passivation; silicides cemented carbides; cermets; iron binders; radiation shielding; micro-indentation; passivation; silicides
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Humphry-Baker, S.; Marshall, J. Structure and Properties of High-Hardness Silicide Coatings on Cemented Carbides for High Temperature Applications. Coatings 2018, 8, 247.

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