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设计了一套隔热材料高温(>1200℃)隔热效果的测试装置,可对隔热材料进行快速、低成本的有效测试和筛选。采用本装置在材料热面中心温度为1600℃±10℃时,考察了碳/酚醛复合材料和ZrO2纤维板材料背部升温历程,评价了2种材料的隔热性能,并采用有限差分法数值模拟了ZrO2纤维板材料背部升温历程,预测其有效导热系数。研究表明,在加热初期400 s时间内,碳/酚醛复合材料的隔热性能优于ZrO2纤维板的隔热性能,后期则相反;ZrO2纤维板的隔热性能与体积密度有关,有效导热系数随温度升高而非线性地增大。
A set of high temperature (> 1200 ℃) thermal insulation test equipment for thermal insulation materials was designed to effectively and quickly insulate the thermal insulation materials at a low cost. The temperature rise of the carbon / phenolic composite and the ZrO2 fiberboard was investigated by using this device when the center temperature of the hot surface of the material was 1600 ℃ ± 10 ℃. The thermal insulation performance of the two materials was evaluated and the numerical simulation by finite difference method ZrO2 fiber material back heating process to predict the effective thermal conductivity. The results show that the thermal insulation performance of carbon / phenolic composites is better than that of ZrO2 fiberboard in 400 s in the initial stage of heating, while the latter is in the opposite phase. The thermal insulation performance of ZrO2 fiberboard is related to the bulk density. The effective thermal conductivity increases with temperature High but not linear increase.