不同n_(Al):n_(Si)的Al_(2)O_(3)-SiO_(2)复合气凝胶制备及其耐热性能研究  

Preparation and Thermal Stability of Al_(2)O_(3)-SiO_(2)Composite Aerogel with Different n_(Al):n_(Si)Ratios

作　　者：张国涛 吴奕怡 薛俊东 吴建锋[3] 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)

机构地区：[1]广东金意陶陶瓷集团有限公司,佛山528000 [2]珠海科技学院应用化学与材料学院,珠海519040 [3]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《中国陶瓷》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)。

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.

关 键 词：Al_(2)O_(3)-SiO_(2)复合气凝胶 常压干燥 耐热稳定性 

分 类 号：TQ427.36[化学工程] O648.17[理学—物理化学]