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二氧化钍粉末比表面检测方法研究
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摘要
二氧化钍作为一种新型的核电燃料已受到世界各国的重视,它具有比二氧化铀更高的热导性。氮气吸附法测定二氧化钍粉末比表面积是一种有效的方法。本工作以BET理论为依据,研究液氮温度下二氧化钍粉末对氮气的吸附行为。围绕脱气时间、脱气温度以及取样量进行了大量的试验,分析了影响二氧化钍粉末的比表面积测定的因素,通过正交优化实验得到了最优化试验参数,并建立了测定二氧化钍粉末比表面积的最佳试验方案。该检测方法的精密度优于2%。
Thorium dioxide powder has seen important as a new nuclear fuel,which has better thermal conductance than uranium dioxide powder.Nitrogen adsorption is an effective method in the study of specific surface area of ThO_2.Basing on the BET theory and studying the behavior of ThO_2 powder absorbing N_2 at liquid nitrogen temperature.It has been taking many studies on the sample volume,the time of desorption and the temperature of desorption to study the factors that influence the specific surface area of ThO_2.Through orthogonal experiments,the best determination parameters were found and the determination method of specific surface area of thorium dioxide powder was established.The precision of this test method can be better than 2%.
引文
[1]GB/T 19587-2004气体吸附BET法测定固态物质比表面积[S].
    [2]陈庆云.MOX模拟燃料分析检测技术研究[J].核科技进展,2010,8(4):187-202.

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