摘要
传统二氧化硅(SiO_(2))气凝胶脆性较大,高温下结构容易收缩,严重限制其应用。在保证SiO_(2)气凝胶高比表面积、高孔隙率的前提下,结合三氧化二铝(Al_(2)O_(3))熔点高、热稳定性极好等优点,可有效提升材料耐热性能。利用溶胶凝胶法常压干燥制备Al_(2)O_(3)-SiO_(2)复合气凝胶,通过调控n_(Al)和n_(Si)比例,研究材料热稳定性的变化情况。当n_(Al):n_(Si)是4∶1时,耐热性能最优,复合气凝胶的耐热温度从800℃提升到1200℃,且比表面积高达570.82 m^(2)/g,即使800℃热处理3 h后,比表面积仍高达410.86 m^(2)/g,孔径维持在10~30 nm。随热处理温度的逐渐升高,虽然Al_(2)O_(3)-SiO_(2)复合气凝胶的比表面积逐渐减小,但外观未发生明显变化、内部结构不坍塌,材料热稳定性能大大提高。
The traditional silicon dioxide(SiO_(2))aerogel is brittle and its structure is easily shrunk at high temperatures,which seriously limits its application.And aluminum oxide(Al_(2)O_(3))has high melting point and excellent thermal stability.In this paper,Al_(2)O_(3)-SiO_(2)composite aerogel is prepared by means of sol-gel ambient pressure drying,and the changing situation of thermal stability of materials was studied by adjusting the proportions of n_(Al)and n_(Si).When n_(Al):n_(Si)equals 4∶1,the thermal stability achieved an optimal outcome,the heat-resistance temperature increased from 800℃to 1200℃,and the specific surface area was up to 570.82 m^(2)/g,and even after the process of heat treatment for 3 h under 800℃,the specific surface area was still up to 410.86 m^(2)/g,and the pore size was maintained at 10~30 nm.The heat resistance performance of materials was greatly improved.
作者
张国涛
吴奕怡
薛俊东
吴建锋
唐秀平
侯雨
ZHANG Guotao;WU Yiyi;XUE Jundong;WU Jianfeng;TANG Xiuping;HOU Yu(Guangdong Kito Ceramics Group Co.,Ltd,Foshan 528000,China;School of Applied Chemistry and Materials,Zhuhai College of Science and Technology,Zhuhai 519040,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)
出处
《中国陶瓷》
CAS
CSCD
北大核心
2023年第10期30-35,共6页
China Ceramics
基金
广东省创新强校工程项目(2021KQNCX145)。
