本文对自由空间和多孔介质内气相热导率进行了理论研究,采用基于瞬态平面热源法的Hot Disk热常数分析仪实现了0.01 Pa～1 MPa压力范围内纳米多孔材料等效热导率的准确测试.实验研究了温度、压力对纳米多孔材料等效热导率的影响规律,并剥离获得了气相导热对纳米多孔材料等效热导率的贡献.结果表明:纳米多孔材料的等效热导率随气氛压力的升高而迅速增加,实验剥离的纳米多孔材料中气相导热的贡献要高于纳米多孔材料中的气相热导率,压力越高,差别越大,在1 MPa时高于自由空间中的气相热导率;温度对纳米多孔材料中气相导热的影响在压力高于400 kPa时比较明显.
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