低温低压条件下辉石粉末的热导率实验分析:对月球及火星表面热环境研究的指示

发布时间：2018-04-22 14:19

本文选题：月球 + 火星　；参考：《岩石学报》2016年01期

【摘要】：在真空条件下矿物粉末热导率的实验测量,可为我们研究月球及行星表面的热属性和热演化,解译热红外和微波探测数据,开展月球及行星探测载荷设计提供重要的数据参数。本研究主要采用改造后的Hot Disk TPS 2500S导热仪对辉石粉末的热导率进行测量。同时,分析了真空度、温度对辉石粉末热导率的影响。实验结果表明:1)热导率随着真空度的降低呈下降趋势,大气压力在1000Pa时,辉石粉末热传导机制发生明显改变。在低压条件下(1000Pa)热导率随真空度的变化趋于平缓;2)辉石粉末热导率随温度的升高而增大,但是增大的幅度在低压和常压条件下存在明显差异。根据实验结果,提出了低压条件下辉石粉末热导率随真空度和温度变化的关系式。本研究表明,在月球和火星表面热环境的研究中,温度和压力对热导率的影响程度是不同的。上述结果对未来开展地外样品的热导率测量提供了重要的参考。
[Abstract]:The experimental measurement of thermal conductivity of mineral powder under vacuum condition can provide important data parameters for studying the thermal properties and thermal evolution of the lunar and planetary surfaces, interpreting the thermal infrared and microwave detection data, and developing the lunar and planetary exploration load design. In this study, the thermal conductivity of pyroxene powder was measured by the modified Hot Disk TPS 2500S thermal conductivity instrument. At the same time, the influence of vacuum and temperature on the thermal conductivity of pyroxene powder was analyzed. The experimental results show that the thermal conductivity of pyroxene powder decreases with the decrease of vacuum, and the heat conduction mechanism of pyroxene powder changes obviously when atmospheric pressure is at 1000Pa. The thermal conductivity of pyroxene powder increases with the increase of temperature, but the range of increase is obviously different between low pressure and normal pressure. Based on the experimental results, the relationship between the thermal conductivity of pyroxene powder and vacuum and temperature is presented. This study shows that the influence of temperature and pressure on thermal conductivity is different in the study of thermal environment on the surface of the moon and Mars. These results provide an important reference for the measurement of thermal conductivity of extraterrestrial samples in the future.
【作者单位】：中国科学院地球化学研究所月球与行星科学研究中心;中国科学院地球化学研究所环境地球化学国家重点实验室;
【基金】：国家自然科学基金项目(41490630、41373067、41403057) 中国科学院青年创新促进会项目(2014359)联合资助
【分类号】：P184;P185.3

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