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Synthesis of Zr2Al3C4 coatings on zirconium-alloy substrates with Al-C/Si interlayers as diffusion barriers
Tianjin Univ, Peoples R China; Chinese Acad Sci, Peoples R China.
Tianjin Univ, Peoples R China; Hebei Univ Technol, Peoples R China.
Chinese Acad Sci, Peoples R China.
Chinese Acad Sci, Peoples R China.
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2019 (English)In: Vacuum, ISSN 0042-207X, E-ISSN 1879-2715, Vol. 160, p. 128-132Article in journal (Refereed) Published
Abstract [en]

Zr2Al3C4 coatings are potential candidates to prevent claddings of traditional Zr-based alloys from severe oxidation in water steam at high temperature. However, the diffusion of aluminum between coating and substrates at high temperature results in a coating composition deviating from the compositional domain for formation of the Zr2Al3C4 phase. Thus, synthesis of Zr2Al3C4 coatings on zirconium-alloy substrates is challenging. Here, we report that the Zr2Al3C4 phase can be obtained on zirconium alloy (ZIRLO) substrates where an Al-C/Si interlayer deposited by magnetron sputtering is introduced. The Al-C/Si interlayer prevented elemental diffusion of aluminum between the Zr-Al-C coating and the substrates during a post-annealing process at 800 degrees C for 3 h. The Al/Zr ratio of the Zr-Al-C coating after annealing was 0.96 and 0.59 in the cases of with and without Al-C/Si interlayer, respectively. Hence, the Al-C/Si interlayer acts as diffusion barrier and greatly decreases the deviation from the standard stoichiometric ratio of the Zr2Al3C4 phase, which facilitates the formation of the Zr2Al3C4 phase in the final coating.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 160, p. 128-132
Keywords [en]
Zr2Al3C4; Coating; Interlayer; Diffusion
National Category
Corrosion Engineering
Identifiers
URN: urn:nbn:se:liu:diva-154683DOI: 10.1016/j.vacuum.2018.11.029ISI: 000456491300018OAI: oai:DiVA.org:liu-154683DiVA, id: diva2:1292653
Note

Funding Agencies|National Natural Science Foundation of China [91226202, 91426304, 51873146]; Major Project of the Ministry of Science and Technology of China [2015 ZX06004-001]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]

Available from: 2019-02-28 Created: 2019-02-28 Last updated: 2019-03-15

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The full text will be freely available from 2020-11-16 15:47
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