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Mullite fiber composite Si-O-C aerogel and preparation method thereof
The invention belongs to the field of aerogel composite thermal insulation materials, and particularly relates to mullite fiber composite Si-O-C aerogel and a preparation method thereof. The preparation method comprises the steps of Si-O-C precursor sol preparation, composite forming, gel aging, supercritical drying, high-temperature cracking and the like. According to the preparation method, a substance containing a carbon element is introduced into a preparation process of the SiO2 aerogel, the SiO2 aerogel with the carbon element in chemical components is firstly prepared, then under the protection of inert gas, the carbon element is subjected to high-temperature pyrolysis, carbon atoms enter a Si-O chain structure of the SiO2 aerogel, and the temperature resistance of the SiO2 aerogel is improved to 1100 DEG C. Meanwhile, the Si-O-C aerogel is compounded with mullite fibers with the highest temperature resistance of 1400 DEG C, so that the mullite fiber compounded Si-O-C aerogel is prepared, and the problems that the Si-O-C aerogel is light in mass, fragile and incapable of being directly used as a product are solved.
本发明属于气凝胶复合保温材料领域，具体涉及一种莫来石纤维复合Si‑O‑C气凝胶及其制备方法。所述制备方法包括配制Si‑O‑C前驱体溶胶、复合成型、凝胶老化、超临界干燥和高温裂解等步骤。本发明是在SiO2气凝胶的制备工艺中引入含有碳元素的物质，首先制备出化学成份中带有碳元素的SiO2气凝胶，再在惰性气体保护下，将碳元素高温裂解，让碳原子进入SiO2气凝胶的Si‑O链结构中，将其耐温性能提高至1100℃。同时，将其与最高耐温高达1400℃的莫来石纤维复合，制备出莫来石纤维复合Si‑O‑C气凝胶，解决Si‑O‑C气凝胶质轻，易碎，无法直接成为产品使用的问题。
Mullite fiber composite Si-O-C aerogel and preparation method thereof
The invention belongs to the field of aerogel composite thermal insulation materials, and particularly relates to mullite fiber composite Si-O-C aerogel and a preparation method thereof. The preparation method comprises the steps of Si-O-C precursor sol preparation, composite forming, gel aging, supercritical drying, high-temperature cracking and the like. According to the preparation method, a substance containing a carbon element is introduced into a preparation process of the SiO2 aerogel, the SiO2 aerogel with the carbon element in chemical components is firstly prepared, then under the protection of inert gas, the carbon element is subjected to high-temperature pyrolysis, carbon atoms enter a Si-O chain structure of the SiO2 aerogel, and the temperature resistance of the SiO2 aerogel is improved to 1100 DEG C. Meanwhile, the Si-O-C aerogel is compounded with mullite fibers with the highest temperature resistance of 1400 DEG C, so that the mullite fiber compounded Si-O-C aerogel is prepared, and the problems that the Si-O-C aerogel is light in mass, fragile and incapable of being directly used as a product are solved.
本发明属于气凝胶复合保温材料领域，具体涉及一种莫来石纤维复合Si‑O‑C气凝胶及其制备方法。所述制备方法包括配制Si‑O‑C前驱体溶胶、复合成型、凝胶老化、超临界干燥和高温裂解等步骤。本发明是在SiO2气凝胶的制备工艺中引入含有碳元素的物质，首先制备出化学成份中带有碳元素的SiO2气凝胶，再在惰性气体保护下，将碳元素高温裂解，让碳原子进入SiO2气凝胶的Si‑O链结构中，将其耐温性能提高至1100℃。同时，将其与最高耐温高达1400℃的莫来石纤维复合，制备出莫来石纤维复合Si‑O‑C气凝胶，解决Si‑O‑C气凝胶质轻，易碎，无法直接成为产品使用的问题。
Mullite fiber composite Si-O-C aerogel and preparation method thereof
一种莫来石纤维复合Si-O-C气凝胶及其制备方法
ZHOU XIAOFANG (author) / LI JIANPING (author) / SUN BO (author) / HE TAO (author) / MA BIN (author) / ZHANG ZHIJIAN (author)
2024-05-28
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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