超轻质ZrO2纤维隔热材料的热物理性能研究
Study on Thermo-physical Properties of Ultra-light Weight ZrO2 Fibrous Insulation Material
薛叶叶, 殷小玮
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作者单位：(西北工业大学 超高温复合材料国防科技重点实验室， 陕西 西安 710072)
中文关键字：有效导热系数； ZrO2纤维隔热材料； 热传导； 热防护系统
英文关键字：effective thermal conductivity; ZrO2 fibrous insulation materials; heat transfer; thermal protection system (TPS)
中文摘要：采用Hot disk热分析仪和石英灯辐射加热法分别测试分析了ZrO2纤维隔热材料的常温和高温隔热性能。研究表明，随材料孔隙率的增大，ZrO2纤维隔热材料的有效导热系数减小，即隔热效果越好；在孔隙率相同的情况下，材料晶粒尺寸越小其有效导热系数就越小；随试样表面温度的升高， 在热传导的过程中辐射起主导作用，从而使材料的有效导热系数增大；当温度由200 ℃升高到800 ℃时，ZrO2纤维隔热材料的有效导热系数由0.027 W/(m·K)升高到0.085 W/(m·K)，在800 ℃达到热稳定时，ZrO2纤维隔热材料冷边的温度不高于30 ℃。
英文摘要：The thermo-physical properties of ZrO2 fibrous insulation material at room temperature and high temperature were tested by hot disk and quartz lamp heater, respectively. For ZrO2 fibrous insulation materials, the effective thermal conductivity decreases with increasing the porosity, implying the better heat resistance. Under the same porosity, the smaller the grain size, the smaller the effective thermal conductivity. With the increase of sample surfacing temperature, radiation is the dominant heat transfer mechanism, which make the effective thermal conductivity sharply increase. When the testing temperature increases from 200 ℃ to 800 ℃, the effective thermal conductivity improves from 0.027 W/(m·K) to 0.085 W/(m·K). When the thermal stability arrives at 800 ℃, the temperature at the cold side of ZrO2 fibrous insulation material is less than that at 30 ℃.