Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Silicon carbide aerogel material and preparation method thereof
The invention belongs to the field of ceramic aerogel, and discloses a silicon carbide aerogel material and a preparation method thereof.The preparation method comprises the following steps that 1, terephthalaldehyde, amino silane, organosiloxane, acetic acid, ethyl alcohol and deionized water are mixed to be uniform, and polysiloxane wet gel is obtained through organosilane hydrolysis copolycondensation reaction; (2) performing aging and vacuum drying on the polysiloxane wet gel obtained in the step (1) to obtain polysiloxane aerogel; and (3) heating the polysiloxane aerogel obtained in the step (2) to 1400-1600 DEG C in an argon atmosphere at a heating rate of 1-5 DEG C/min, and carrying out high-temperature heat treatment for 2-5 hours to obtain the blocky silicon carbide aerogel. According to the invention, sol-gel is combined with vacuum drying to prepare an organic bridged silsesquioxane aerogel precursor, and then the blocky silicon carbide aerogel with good crystallinity, single phase and complete structure is obtained through a one-step high-temperature carbon thermal reduction process.
本发明属于陶瓷气凝胶领域，公开了一种碳化硅气凝胶材料及其制备方法，制备方法包括以下步骤：(1)将对苯二甲醛、氨基硅烷、有机硅氧烷、醋酸、乙醇和去离子水混合均匀，经过有机硅烷水解共缩聚反应得到聚硅氧烷湿凝胶；(2)将步骤(1)得到的聚硅氧烷湿凝胶经过老化和真空干燥获得聚硅氧烷气凝胶；(3)将步骤(2)得到的聚硅氧烷气凝胶在氩气氛围下以1‑5℃/min升温速率加热至1400‑1600℃高温热处理2‑5h，得到块状碳化硅气凝胶。本发明采用溶胶凝胶结合真空干燥制备有机桥联半倍硅氧烷气凝胶前驱体，再经过一步高温碳热还原过程得到了结晶性好、物相单一、结构完整的块状碳化硅气凝胶。
Silicon carbide aerogel material and preparation method thereof
The invention belongs to the field of ceramic aerogel, and discloses a silicon carbide aerogel material and a preparation method thereof.The preparation method comprises the following steps that 1, terephthalaldehyde, amino silane, organosiloxane, acetic acid, ethyl alcohol and deionized water are mixed to be uniform, and polysiloxane wet gel is obtained through organosilane hydrolysis copolycondensation reaction; (2) performing aging and vacuum drying on the polysiloxane wet gel obtained in the step (1) to obtain polysiloxane aerogel; and (3) heating the polysiloxane aerogel obtained in the step (2) to 1400-1600 DEG C in an argon atmosphere at a heating rate of 1-5 DEG C/min, and carrying out high-temperature heat treatment for 2-5 hours to obtain the blocky silicon carbide aerogel. According to the invention, sol-gel is combined with vacuum drying to prepare an organic bridged silsesquioxane aerogel precursor, and then the blocky silicon carbide aerogel with good crystallinity, single phase and complete structure is obtained through a one-step high-temperature carbon thermal reduction process.
本发明属于陶瓷气凝胶领域，公开了一种碳化硅气凝胶材料及其制备方法，制备方法包括以下步骤：(1)将对苯二甲醛、氨基硅烷、有机硅氧烷、醋酸、乙醇和去离子水混合均匀，经过有机硅烷水解共缩聚反应得到聚硅氧烷湿凝胶；(2)将步骤(1)得到的聚硅氧烷湿凝胶经过老化和真空干燥获得聚硅氧烷气凝胶；(3)将步骤(2)得到的聚硅氧烷气凝胶在氩气氛围下以1‑5℃/min升温速率加热至1400‑1600℃高温热处理2‑5h，得到块状碳化硅气凝胶。本发明采用溶胶凝胶结合真空干燥制备有机桥联半倍硅氧烷气凝胶前驱体，再经过一步高温碳热还原过程得到了结晶性好、物相单一、结构完整的块状碳化硅气凝胶。
Silicon carbide aerogel material and preparation method thereof
一种碳化硅气凝胶材料及其制备方法
SHAO GAOFENG (Autor:in) / DING CHENGXI (Autor:in) / HU DONGXIAO (Autor:in) / LAI YIFAN (Autor:in) / HUANG XIAOGU (Autor:in)
12.04.2022
Patent
Elektronische Ressource
Chinesisch
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