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发明公开
CN104261798A 一种耐高温SiCOB气凝胶隔热复合材料及其制备方法 有权

一种耐高温SiCOB气凝胶隔热复合材料及其制备方法
摘要：
本发明公开了一种耐高温SiCOB气凝胶隔热复合材料及其制备方法。耐高温SiCOB气凝胶隔热复合材料由耐高温无机陶瓷纤维与SiCOB气凝胶组成；耐高温无机陶瓷纤维、SiCOB气凝胶体积百分含量分别为20～70％、30-80％。制备方法是：配制SiCOB有机前驱体溶胶、制备纤维预制件、将纤维预制件与溶胶进行混合，待混合体凝胶后，经老化、超临界干燥后得到SiCOB气凝胶复合材料前驱体，再将气凝胶隔热复合材料前驱体进行高温裂解，得到耐高温、抗氧化SiCOB气凝胶隔热复合材料。本发明复合材料导热系数低，高温隔热性能好，耐温性能及耐高温氧化性能显著提高，最高使用温度可达1500℃；制备方法低成本、无环境污染。
摘要（英）：

The invention discloses a high-temperature-resistant SiCOB aerogel heat-insulation composite material and a preparation method thereof. The high-temperature-resistant SiCOB aerogel heat-insulation composite material is composed of the following components in percentage by volume: 20-70% of high-temperature-resistant inorganic ceramic fiber and 30-80% of SiCOB aerogel. The preparation method comprises the following steps: preparing a SiCOB organic precursor sol, preparing a fiber prefabricated part, and mixing the fiber prefabricated part with the sol; after the mixture gelates, aging, and carrying out supercritical drying to obtain the SiCOB aerogel composite material precursor; and carrying out pyrolytic cracking on the aerogel heat-insulation composite material precursor to obtain the high-temperature-resistant oxidation-resistant SiCOB aerogel heat-insulation composite material. The composite material has the advantages of low heat conductivity coefficient, favorable high-temperature insulation performance, obviously higher temperature resistance and obviously higher high-temperature oxidation resistance; and the maximum application temperature can reach 1500 DEG C. The preparation method has the advantages of low cost and no environmental pollution.

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