| UO2-x燃料芯块的晶粒生长动力学 |
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| 引用本文： | 尹邦跃,吴学志,魏国良,屈哲昊,郑新海,王轩,任劲如.UO2-x燃料芯块的晶粒生长动力学[J].原子能科学技术,2021,55(2):296-304. |
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| 作者姓名： | 尹邦跃 吴学志 魏国良 屈哲昊 郑新海 王轩 任劲如 |
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| 作者单位： | 中国原子能科学研究院 反应堆工程技术研究部，北京102413 |
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| 摘 要： | 本文采用恒速升温和等温烧结实验方法研究了亚化学计量UO2-x燃料芯块的晶粒生长动力学。结果表明，以UO2+x+5%U为原料，可得到密度为94.91%TD～96.23%TD（TD为理论密度）、O与U的原子个数比为1.975～1.990的合格的亚化学计量UO2-x燃料芯块；在烧结温度≤1 650 ℃时晶粒生长速率较低，在烧结温度≥1750 ℃时晶粒生长速率较高；初始晶粒尺寸G0不能忽略不计，亚化学计量UO2-x燃料芯块的晶粒生长动力学符合4次方模型G4-G40=k0texp(-1 000Q/RT)，晶粒生长速率常数k0=78.76 μm4/h，激活能Q=433.35 kJ/mol。
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| 关 键 词： | 二氧化铀 晶粒尺寸 晶粒生长动力学 激活能 亚化学计量 |
Grain Growth Kinetics of UO2-x Fuel Pellet |
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| YIN Bangyue,WU Xuezhi,WEI Guoliang,QU Zhehao,ZHENG Xinhai,WANG Xuan,REN Jinru.Grain Growth Kinetics of UO2-x Fuel Pellet[J].Atomic Energy Science and Technology,2021,55(2):296-304. |
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| Authors: | YIN Bangyue WU Xuezhi WEI Guoliang QU Zhehao ZHENG Xinhai WANG Xuan REN Jinru |
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| Affiliation: | Division of Reactor Engineering Technology Research, China Institute of Atomic Energy, Beijing 102413, China |
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| Abstract: | Grain growth kinetics of the substoichiometric UO2-x fuel pellets were studied with constant heating speed and isothermal sintering experiments. Substoichiometric UO2-x fuel pellets can be fabricated with qualified density of 94.91%TD-96.23%TD (TD is theory density) and O and U atomic ratio of 1.975-1.990 when the mixed powders of UO2+x and 5%U are sintered. Grain growth rate is very low when sintering temperature is below 1 650 ℃, but higher above 1750 ℃. It is found that the starting grain size G0 cannot be neglected and the grain growth kinetics equation of the substoichiometric UO2-x fuel pellets is G4-G40=k0texp(-1 000Q/RT), resulting in grain growth feature exponent n=4, rate constant k0=78.76 μm4/h and activation energy Q=433.35 kJ/mol. |
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| Keywords: | uranium oxide grain size grain growth kinetics activation energy substoichiometric |
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