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Open AccessArticle

Hydrogen Sorption Kinetics of SiC-Coated Zr-1Nb Alloy

1
School of Nuclear Science and Engineering, National Research Tomsk Polytechnic University, 634050 Tomsk, Russian
2
School of Energy and Power Engineering, National Research Tomsk Polytechnic University, 634050 Tomsk, Russian
3
Department of Physical Metallurgy and Materials Technology, Brandenburg Technical University, 03046 Cottbus, Germany
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(1), 31; https://doi.org/10.3390/coatings9010031
Received: 12 November 2018 / Revised: 2 January 2019 / Accepted: 3 January 2019 / Published: 8 January 2019
This paper describes the influence of silicon carbide (SiC) coating on hydrogen sorption kinetics of zirconium alloy E110 (Zr-1Nb). Amorphous SiC coating of 1.5-μm thickness was deposited on Zr-1Nb alloy substrate by direct current magnetron sputtering of composite cathode. Hydrogen absorption by SiC-coated Zr-1Nb alloy significantly decreased due to low hydrogen permeability of the coating. Hydrogenation tests show that SiC coating provides protective properties against hydrogen permeation in the investigated temperature range of 350–450 °C. It was shown that hydrogenation of uncoated Zr-1Nb leads to formation of δ hydrides at 350 °C and δ and γ hydrides at higher temperatures whereas in the SiC-coated Zr-1Nb alloy only δ hydrides formed. Gradient hydrogen distribution through the SiC coating and H trapping in the carbon-rich interface was observed. The adhesion strength of the coating was ~5 N. Hydrogenation up to 450 °C for 5 h does not degrade the adhesion properties during scratch testing. View Full-Text
Keywords: hydrogen sorption; hydrogenation; zirconium alloys; E110 (Zr-1Nb); SiC coating; magnetron sputtering; adhesion hydrogen sorption; hydrogenation; zirconium alloys; E110 (Zr-1Nb); SiC coating; magnetron sputtering; adhesion
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Kashkarov, E.B.; Syrtanov, M.S.; Murashkina, T.L.; Kurochkin, A.V.; Shanenkova, Y.; Obrosov, A. Hydrogen Sorption Kinetics of SiC-Coated Zr-1Nb Alloy. Coatings 2019, 9, 31.

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