第20届全国高技术陶瓷学术年会
Al2 O3 -SiO2 复合气凝胶的制备与表征
李华鑫, 陈俊勇, 乐弦, 向军辉
中国科学院大学材料科学与光电技术学院,北京 101400
Preparation and Characterization of Al2 O3 -SiO2 Composite Aerogels
LI Huaxin, CHEN Junyong, YUE Xian, XIANG Junhui
College of Materials Science and Opto-electronic Technology, University of Chinese Academy of Sciences, Beijing 101400
摘要 本实验以六水合氯化铝(AlCl3 ·6H2 O)和正硅酸四乙酯(TEOS)为前驱体,采用溶胶-凝胶法,通过真空冷冻干燥制备Al2 O3 -SiO2 复合气凝胶。采用扫描电子显微镜(SEM)、傅里叶红外光谱(FTIR)仪、X射线衍射(XRD)仪、透射电子显微镜(TEM)等手段分析了Si含量对气凝胶的微观形貌、结构等性能的影响。傅里叶红外光谱分析表明,在单组分Al2 O3 气凝胶中引入硅后,Al-OH结构部分吸收峰消失,出现大量的Al-O-Si结构;当铝与硅物质的量为4:1时,复合气凝胶经过1 000 ℃高温热处理后,其比表面积仍高达253 m2 /g;经过1 200 ℃高温热处理并保温2 h后,XRD图表明出现大量莫来石相衍射峰,未出现α-Al2 O3 相,引入-Si基团可以抑制Al2 O3 的晶型转变,显著提高气凝胶的高温热稳定性。
关键词:
Al2 O3 -SiO2
复合气凝胶
真空冷冻干燥
热稳定性
Abstract: In this paper, Al2 O3 -SiO2 composite aerogels were prepared by vacuum freeze-drying method using hexahydrate aluminum chloride (AlCl3 ·6H2 O) and tetraethyl orthosilicate (TEOS) as precursors. Scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM) were used to analyze the effects of Si content on the micromorphology structure and other properties of aerogels. FTIR analysis showed that after the introduction of silicon into the Al2 O3 aerogels, the partial absorption peak of Al-OH structure disappeared and a large number of Al-O-Si structures appeared. When the ratio of Al to Si is 4:1, the specific surface area of the composite aerogel is still as high as 253 m2 /g after 1 000 ℃ high temperature heat treatment. After heat treatment at 1 200 ℃ for 2 h, the XRD diagram showed that a large number of mullite phase diffraction peaks and no α-Al2 O3 phase appear. The introduction of -Si group can inhibit the crystal transformation of Al2 O3 and greatly improve the thermal stability of aerogels at high temperature.
Key words:
Al2 O3 -SiO2
composite aerogels
vacuum freeze-drying
thermal stability
出版日期: 2019-09-25
发布日期: 2019-07-31
通讯作者:
xiangjh@ucas.ac.cn
作者简介: 李华鑫,2017年6月毕业于河南理工大学,获得工学学士学位。现为中国科学院大学材料科学与光电技术学院硕士研究生,在向军辉教授的指导下进行研究。目前主要研究领域为功能材料。
引用本文:
李华鑫, 陈俊勇, 乐弦, 向军辉. Al2 O3 -SiO2 复合气凝胶的制备与表征[J]. 材料导报, 2019, 33(18): 3170-3174.
2 O3 -SiO2 Composite Aerogels. Materials Reports, 2019, 33(18): 3170-3174.
链接本文:
http://www.mater-rep.com/CN/10.11896/cldb.19040022
或
http://www.mater-rep.com/CN/Y2019/V33/I18/3170
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2019, Vol. 33 
