摘要
混合氧化物(MOX)燃料的热导率是影响其堆内服役性能的关键参数之一。目前MOX燃料热导率随成分的变化多采用实验数据拟合得到的经验公式进行计算,缺乏系统的理论研究。本研究基于经典声子热传导理论,通过对MOX燃料在不同Pu含量和氧金属比(O/M)下热导率影响因素的分析,研究了不同类型点缺陷对其热导率的影响。研究结果表明,采用声子传导模型可以较好地预测不同成分MOX燃料的热导率。MOX燃料中离子替代型点缺陷造成的质量差和半径差对热导率的影响权重相对较小,而MOX燃料不同O/M比造成的氧空位型点缺陷对热导率的影响权重相对较大。
Thermal conductivity of MOX fuel is one of the key parameters to influence its service performance in reactor.However,the thermal conductivity variation of MOX fuels with composition is usually determined by the empirical formula obtained from the experimental data,and few investigations have been conducted on a theoretical basis.In this study,the effect of various point defects on the thermal conductivity of MOX fuel was investigated by analyzing the influence factors of thermal conductivity for MOX samples with different Pu content and O/M in light of the classical phonon conduction theory.The results show that the phonon conduction models can be used to predict the thermal conductivity of MOX fuels with different compositions.The oxygen vacancies induced by hypo-stoichiometry in MOX fuel predominate in determining the thermal conductivity,rather than the substituted ions point defects with small mass and radius difference.
作者
刘洋
瞿志学
杜爱兵
Liu Yang;Qu Zhixue;Du Aibing(Reactor Engineering Technology Research Division,China Institute of Atomic Energy,Beijing 102413,China;Key Laboratory of Advanced Functional Materials,Education Ministry of China,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2022年第4期1312-1317,共6页
Rare Metal Materials and Engineering
基金
北京市自然科学基金(2182007)
北京市属高校高水平教师队伍建设支持计划青年拔尖人才培育计划(CIT&TCD201704031)。
关键词
点缺陷
MOX燃料
热导率
氧空位
point defects
MOX fuels
thermal conductivity
oxygen vacancies
