Al含量对Ti2AlC在核反应堆失水事故下抗氧化性能的影响

doi:10.15541/jim20210029

无机材料学报 ›› 2021, Vol. 36 ›› Issue (10): 1097-1102.DOI: 10.15541/jim20210029

所属专题：【虚拟专辑】放射性污染物去除(2020~2021)；【结构材料】核用陶瓷

Al含量对Ti₂AlC在核反应堆失水事故下抗氧化性能的影响

雷一明¹^,²(), 张洁¹(), 柏广海³, 张晏伟³, 王晓辉¹, 王京阳¹

1.中国科学院金属研究所, 沈阳材料科学国家研究中心, 沈阳 110016
2.中国科学技术大学材料科学与工程学院, 沈阳 110016
3.苏州热工研究院有限公司电站寿命管理技术中心, 苏州 215004

收稿日期:2021-01-15 修回日期:2021-01-29 出版日期:2021-10-20 网络出版日期:2021-03-01
通讯作者: 张洁, 研究员. E-mail: jiezhang@imr.ac.cn
作者简介:雷一明(1992–), 男, 博士研究生. E-mail: ymlei14s@imr.ac.cn

Influence of Al Content on Oxidation Resistance of Phase-pure Ti₂AlC under Simulated Loss-of-coolant Accident Conditions

LEI Yiming¹^,²(), ZHANG Jie¹(), BAI Guanghai³, ZHANG Yanwei³, WANG Xiaohui¹, WANG Jingyang¹

1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
3. Life Management Technology Center, Suzhou Nuclear Power Research Institute, China Nuclear Power Technology Research Institute, Suzhou 215004, China

Received:2021-01-15 Revised:2021-01-29 Published:2021-10-20 Online:2021-03-01
Contact: ZHANG Jie, professor. E-mail: jiezhang@imr.ac.cn
About author:LEI Yiming (1992–), male, PhD candidate. E-mail: ymlei14s@imr.ac.cn
Supported by:
National Key R&D Program of China(2017YFB0703201);National Natural Science Foundation of China(51772302);National Natural Science Foundation of China-China National Nuclear Corporation Joint Fund(U2067217);Primary Research and Development Project of Suzhou(SGC201840)

摘要/Abstract

摘要：

为了完善Ti₂AlC涂层在事故容错燃料中的设计与应用, 研究了近化学计量比和Al含量不足的Ti₂AlC在1000~1200 ℃ Ar-41% H₂O气氛中的氧化行为。研究结果表明: 随着Al含量的减少, Ti₂AlC在高温水蒸气中的氧化动力学由抛物线规律向线性规律转变; 当Al含量不足时, 连续氧化铝层的生长受到限制, 形成了不具备保护性的TiO₂基氧化层; 近化学计量比的Ti₂AlC表面可生成较薄的连续致密Al₂O₃层, 防止水蒸气向基体内的扩散。因此, 采用近化学计量比的Ti₂AlC作为锆合金表面的防护涂层时, 能够在高温水蒸气的环境下保护包壳, 提升现有轻水反应堆事故容错的能力。

关键词: 事故容错燃料, Ti₂AlC, 高温水蒸气氧化

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.

Key words: accident tolerant fuels, Ti₂AlC, water vapor high-temperature oxidation

中图分类号:

TQ174

雷一明, 张洁, 柏广海, 张晏伟, 王晓辉, 王京阳. Al含量对Ti₂AlC在核反应堆失水事故下抗氧化性能的影响[J]. 无机材料学报, 2021, 36(10): 1097-1102.

LEI Yiming, ZHANG Jie, BAI Guanghai, ZHANG Yanwei, WANG Xiaohui, WANG Jingyang. 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): 1097-1102.

图/表 6

Table 1 Elemental composition of near-stoichiometric and Al-lean samples

Sample	Atomic percent of Ti/%	Atomic percent of Al/%	Atomic percent of C/%	Composition
Near-stoichiometric	(50.25±0.19)	(25.61±0.60)	(24.13±0.61)	Ti₂Al_1.02C
Al-lean	(50.68±0.19)	(22.42±0.86)	(25.90±0.67)	Ti₂Al_0.88C

Fig. 1 XRD patterns of near-stoichiometric and Al-lean samples

Fig. 2 Weight gain per unit surface area as a function of oxidation time for (a) Zr cladding, Al-lean and near-stoichiometric samples oxidized at 1200 ℃, (b) Al-lean sample at 1000-1200 ℃ and (c) near-stoichiometric sample at 1000-1200 ℃, and (d) square of weight gain per unit surface area of near-stoichiometric sample as a function of oxidation time

Fig. 3 Arrhenius plot of the high temperature oxidation rate constants for various candidate materials in air and water vapor[18, 24-26]

Fig. 4 XRD patterns of (a) near-stoichiometric and (b) Al-lean samples after oxidation at 1000-1200 ℃

Fig. 5 Typical surface and cross section morphologies of (a, b) Al-lean and (c, d) near-stoichiometric samples after oxidation at 1200 ℃

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Al含量对Ti₂AlC在核反应堆失水事故下抗氧化性能的影响

Influence of Al Content on Oxidation Resistance of Phase-pure Ti₂AlC under Simulated Loss-of-coolant Accident Conditions

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