Zr2Al3C4 Coatings on Zirconium-alloy Substrates with Enhanced Adhesion and Diffusion Barriers by Al/Mo-C Interlayers

doi:10.15541/jim20200286

Journal of Inorganic Materials ›› 2021, Vol. 36 ›› Issue (5): 541-546.DOI: 10.15541/jim20200286

Special Issue: 【结构材料】热障与环境障涂层；【结构材料】核用陶瓷

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Zr₂Al₃C₄ Coatings on Zirconium-alloy Substrates with Enhanced Adhesion and Diffusion Barriers by Al/Mo-C Interlayers

YE Wenhao¹^,²(), WEI Qiang¹^,³(), LIANG Jiamin¹^,², ZHOU Jie²^,⁴, MENG Fanping², EKLUND Per⁴, HUANG Qing²()

1. School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
2. Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
3. School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China
4. Department of Physics, Chemistry, and Biology (IFM), Linköping University, Linköping 581 83, Sweden

Received:2020-05-25 Revised:2020-08-20 Published:2021-05-20 Online:2021-04-19
Contact: WEI Qiang, professor. E-mail: weiqiang.tju@163.com; HUANG Qing, professor. E-mail: huangqing@nimte.ac.cnhuangqing@nimte.ac.cn
About author:YE Wenhao(1995-), female, Master candidate. E-mail:1097706905@qq.com
Supported by:
National Natural Science Foundation of China(51873146);Ningbo Municipal Natural Science Foundation(2018A610005);Major Project of the Ministry of Science and Technology of China(2015ZX06004-001);Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University(Faculty Grant SFO-Mat-LiU No. 2009 00971)

Abstract

Abstract:

Zircaloy coating is one of the crucial technical ways to improve the accident tolerance of nuclear fuel cladding, which enables the zirconium-water reaction problems to be solved. Zr₂Al₃C₄ coating is one type of candidate solutions to improve the high-temperature oxidation resistance of zirconium claddings. However, little study has been performed on the synthesis of Zr₂Al₃C₄coatings on zirconium alloy substrates due to the inter-diffusion, as well as the difference of the thermal expansion coefficients between the Zr₂Al₃C₄ coating and the substrates. In this study, Zr₂Al₃C₄ coatings were prepared through room-temperature magnetron sputtering and post annealing on zirconium alloy (ZIRLO) substrates with magnetron-sputtered Al/Mo-C interlayers. The effects of Al/Mo-C interlayers on phases and microstructures of Zr-Al-C coatings after annealing were studied by different methods. It is found that the coatings without interlayer are broken and no Zr₂Al₃C₄ phase is formed due to significant interdiffusion between the Zr-Al-C coating and the substrate during annealing at 800 ℃ for 3 h. The Al/Mo-C interlayers prevented elemental diffusion between Zr-Al-C coatings and substrates during the post-annealing process. The Al/Mo-C interlayers act as diffusion barriers and greatly reduce the stoichiometric deviations from Zr₂Al₃C₄ phase, which facilitates the formation of the Zr₂Al₃C₄ phase in the final coating. Moreover, this diffusion-barrier layers contribute to eliminating cracks induced by the difference of the thermal expansion coefficients between the Zr₂Al₃C₄ coatings and substrates. At the same time, the adhesions between Zr-Al-C coatings with Al/Mo-C interlayers and substrates were improved after annealing, with their strength exceeding 30 N.

Key words: Zr₂Al₃C₄, coating interlayer, diffusion, adhesion

CLC Number:

TB34

YE Wenhao, WEI Qiang, LIANG Jiamin, ZHOU Jie, MENG Fanping, EKLUND Per, HUANG Qing. Zr₂Al₃C₄ Coatings on Zirconium-alloy Substrates with Enhanced Adhesion and Diffusion Barriers by Al/Mo-C Interlayers[J]. Journal of Inorganic Materials, 2021, 36(5): 541-546.

Figures/Tables 7

References 19

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Zr₂Al₃C₄ Coatings on Zirconium-alloy Substrates with Enhanced Adhesion and Diffusion Barriers by Al/Mo-C Interlayers

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