螯合剂用量对Al2O3-SiO2气凝胶复合材料性能的影响研究  

Effect of Chelating Agent Dosageon Properties of Al2O3-SiO2 Aerogel Composites

作　　者：杨刚 姜勇刚[2] 冯坚[2] 冯军宗[2] 朱亦刚 YANG Gang;JIANG Yonggang;FENG Jian;FENG Junzong;ZHU Yigang(Composite Testing Technology Centre, AVIC Composite CorporationLtd., Beijing 101300, China;Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China)

机构地区：[1]中航复合材料有限责任公司复合材料检测技术中心,北京101300 [2]国防科技大学新型陶瓷纤维及其复合材料重点实验室,长沙410073

出　　处：《高科技纤维与应用》2019年第5期36-40,共5页Hi-Tech Fiber and Application

摘　　要：针对Al2O3-SiO2溶胶稳定性差、复合材料结构不稳定等问题,通过溶胶-凝胶和超临界干燥工艺制备出Al2O3-SiO2气凝胶复合材料。采用平板导热仪、SEM、BET等对Al2O3-SiO2气凝胶复合材料在不同工艺参数下的结构和性能进行分析与表征,完成了Al2O3-SiO2溶胶制备工艺参数研究,确定了较佳的Al2O3-SiO2气凝胶复合材料优化工艺参数。结果表明:随着螯合剂与仲丁醇铝物质的量的比增加,气凝胶的孔径分布(30~50nm)变化不大,复合材料的密度均匀性提高,在微观结构中,气凝胶与纤维的结合程度先增加后减小,其中螯合剂与仲丁醇铝物质的量的比为0.09时结合较好。Aiming at the problems of poor stability of Al2O3-SiO2 sol and unstable structure of composite materials, Al2O3-SiO2 aerogel composites are prepared by sol-gel and supercritical drying technology. The structure and properties of Al2O3-SiO2 aerogel composites under different technological parameters are analyzed and characterized by means of plate thermal conductivity tester, SEM, BET and so on. The technological parameters of Al2O3-SiO2 sol preparation process are completed, and the better Al2O3-SiO2 aerogel composites are optimized. The results show that the pore size distribution (30-50 nm) of aerogel changes little with the increase of the ratio of chelatingagent to aluminum tri-sec-butoxide, and the density uniformity of the composites increases. In the microstructure, the binding degree of aerogels and fibers increases first and then decreases, and a better one comes when the quantity relativeratio of chelating agent to aluminum tri-sec-butoxide reaches 0.09.

关 键 词：Al2O3-SiO2气凝胶 复合材料 螯合剂 

分 类 号：TQ127.2[化学工程—无机化工]