复合材料科学与工程Issue(2)：67-74,8.DOI:10.19936/j.cnki.2096-8000.20240228.010
Al2O3-SiO2复合纳米气凝胶材料耐高温性能研究
High temperature resistance of Al2O3-SiO2 composite nano aerogel materials
摘要
Abstract
Using tetraethyl orthosilicate(TEOS)and aluminum chloride hexahydrate(AlCl3·6H2O)as the mixed precursor and propylene oxide as the network trapping agent,the aerogel with different molar ratios of Al2O3-SiO2 was prepared by sol-gel process and carbon dioxide supercritical drying method without adding chelating agent.The samples were heat-treated at 600 ℃,800 ℃,1 000 ℃ and 1 200 ℃ respectively,and the micro-morphology,structure and thermal stability of the Al2O3-SiO2 composite aerogel were characterized by Fourier infrared spectros-copy,scanning electron microscopy,X-ray diffractometer,specific surface area analyzer,thermogravimetric differ-ential thermal analyzer and other instruments.The results show that when AlCl3·6H2 O∶TEOS=8∶1,the thermal conductivity of Al2O3-SiO2 aerogel samples after heat treatment at 1 000 ℃ and 1 200 ℃ is 0.062 1 W/m·K and 0.080 3 W/m·K,respectively.The pore size is more uniform and the mesoporous structure is preserved above 1 000℃.At normal temperature and 1 200 ℃,the specific surface area is 617.14 m2/g and 102.9 m2/g,with uniform mesoporous structure(pore diameter is 8～32 nm),and the pore size is lower than the average free path of air at normal temperature.After heat treatment at 1 200 ℃,the total weight loss rate of the sample is 16.3％,which proves the sample has good high temperature thermal stability.关键词
硅铝复合气凝胶/热处理/微观结构/热稳定性/复合材料Key words
Al2O3-SiO2 composite aerogel/heat treatment/microstructure/thermal stability/composites分类
通用工业技术引用本文复制引用
吴佳臻,徐长伟,张忠伦,王明铭..Al2O3-SiO2复合纳米气凝胶材料耐高温性能研究[J].复合材料科学与工程,2024,(2):67-74,8.基金项目
山东省"十四五"重点研发计划项目(2021SFGC0903) （2021SFGC0903）
