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Structure and properties of high-hardness silicide coatings on cemented carbides for high temperature applications
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Humphry-Baker, Samuel and Marshall, Jessica M. (2018) Structure and properties of high-hardness silicide coatings on cemented carbides for high temperature applications. Coatings, 8 (7). 247. doi:10.3390/coatings8070247 ISSN 2079-6412.
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Official URL: http://dx.doi.org/10.3390/coatings8070247
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.
Item Type: | Journal Article | ||||||
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Subjects: | T Technology > TP Chemical technology | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Library of Congress Subject Headings (LCSH): | Carbides, Ceramic metals, Silicides | ||||||
Journal or Publication Title: | Coatings | ||||||
Publisher: | MDPI | ||||||
ISSN: | 2079-6412 | ||||||
Official Date: | 12 July 2018 | ||||||
Dates: |
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Volume: | 8 | ||||||
Number: | 7 | ||||||
Article Number: | 247 | ||||||
DOI: | 10.3390/coatings8070247 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 12 July 2018 | ||||||
Date of first compliant Open Access: | 13 July 2018 | ||||||
RIOXX Funder/Project Grant: |
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