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根据硬硅钙石-气凝胶复合绝热材料的微观结构特点,建立了描述材料内气固耦合导热的三维单元体传热模型.通过模型计算对硬硅钙石型硅酸钙、气凝胶及硬硅钙石-气凝胶复合绝热材料的导热系数进行了对比研究.结果表明:硬硅钙石型硅酸钙密度是影响复合绝热材料有效导热系数的关键因素,而气凝胶密度的影响不大;在高温下,复合绝热材料的导热系数要明显低于硬硅钙石型硅酸钙及二氧化硅气凝胶的导热系数.
According to the microstructural characteristics of xonotlite-airgel composite insulation, a three-dimensional heat transfer model describing the thermal-mechanical coupling of gas-solid coupling in the material was established.According to the calculation results of xonotlite-type calcium silicate, airgel And the thermal conductivity of xonotlite-airgel composites were compared.The results show that the density of xonotlite-type calcium silicate is the key factor affecting the effective thermal conductivity of the composite thermal insulation material, while the density of the airgel The thermal conductivity of the composite thermal insulation material is obviously lower than the thermal conductivity of the xonotlite type calcium silicate and the silica airgel.