• Journal of Inorganic Materials
  • Vol. 36, Issue 10, 1097 (2021)
LEI Yiming1、2, ZHANG Jie1、*, BAI Guanghai3, ZHANG Yanwei3, WANG Xiaohui1, and WANG Jingyang1
Author Affiliations
  • 11. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • 22. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
  • 33. Life Management Technology Center, Suzhou Nuclear Power Research Institute, China Nuclear Power Technology Research Institute, Suzhou 215004, China
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    Abstract

    To tailor Ti2AlC coatings for the applications in accident tolerant fuels, the oxidation of near-stoichiometric and Al-lean Ti2AlC was investigated in Ar-41% H2O atmosphere in 1000-1200 ℃. The oxidation kinetics of phase-pure Ti2AlC in high-temperature water vapor varied from parabolic to linear rate law with Al content decreasing. Insufficient Al content could not sustain the growth of continuous alumina scales, resulting in formation of thick unprotective TiO2-based scales. The formation of thin and protective Al2O3 scale for Ti2AlC with stoichiometric composition effectively inhibited the inward diffusion of water vapor. For the application of protective coatings on Zr-based cladding, stoichiometric Ti2AlC is expected to protect cladding from fast oxidation and improve the accident tolerance in the current light water reactors.

    The development of accident tolerant fuel (ATF) have been launched worldwide to enhance accident tolerance in light water reactors[1,2]. ATFs, in comparison with the standard UO2-Zr system, can provide larger safety margins by reducing the oxidation rate of Zr-based alloy cladding in high temperature water vapor and increasing the coping time after a loss of coolant accident (LOCA) scenario. In a design-basis LOCA, the maximum oxidation allowed to the zirconium alloy is 17% of the tube wall thickness, which takes 20 min at 1100 ℃ and only 8 min at 1200 ℃[3]. A prospective solution is the substitution of Zr alloys with advanced cladding materials or use of protective coatings, which is meant to provide short-term additional protection to the zirconium alloy cladding at high temperature. Surface-modified zircaloy cladding are regarded as a competitive concept with the merits of convenience and economics[4,5].

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    Yiming LEI, Jie ZHANG, Guanghai BAI, Yanwei ZHANG, Xiaohui WANG, Jingyang WANG. Influence of Al Content on Oxidation Resistance of Phase-pure Ti2AlC under Simulated Loss-of-coolant Accident Conditions [J]. Journal of Inorganic Materials, 2021, 36(10): 1097
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    Category: RESEARCH LETTER
    Received: Jan. 15, 2021
    Accepted: --
    Published Online: Nov. 26, 2021
    The Author Email: ZHANG Jie (jiezhang@imr.ac.cn)