轻质复合材料高温隔热性能

High-temperature thermal insulation performance of light mass composites

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 device for thermal insulation performance of high-temperature materials was designed and established to test light mass thermal insulation materials via a rapid and simple procedure.The thermal insulation performance of carbon fiber/phenolic composite and ZrO2 fiberboard were tested by this device when the temperature at the center point of hot face was 1600 ℃±10 ℃.The heat transport process of ZrO2 fiberboard was numerically simulated by finite-difference method,and the effective thermal conductivity was also predicted.The results show that thermal insulation performance of carbon fiber/phenolic composite is better than that of ZrO2 fiberboard from the beginning of test to 400 s,while the thermal insulation performance of ZrO2 fiberboard is better from 400 s to the end of test.Thermal insulation performance of ZrO2 fiberboard is affected by the bulk density,and the effective thermal conductivity of ZrO2 fiberboard increases nonlinearly with the elevated temperature.