铝、铝硅溶胶及其粉末的合成

Synthesis of Aluminium,Aluminium Silicon Sols and Powders

以硝酸铝为铝源、硅溶胶为硅源、柠檬酸为稳定剂,采用溶胶凝胶法制备出了稳定的铝溶胶及铝硅溶胶,分析了硝酸铝与柠檬酸的摩尔比(N/C比)、反应温度、保温时间对铝溶胶形成的影响,确定N/C比3:1、100℃及保温1h是铝溶胶较优的工艺参数。XRD分析表明,经1200℃煅烧2h后,铝凝胶粉转变成了α-Al2O3晶相,铝硅凝胶粉末经1200℃煅烧2h后,样品主要为正交莫来石结构,SEM显示所得粉末为无规则形态。

Stable aluminum and aluminum silicon sols were prepared by sol-gel process using aluminium nitrate as the aluminum source, silicon sol as the silicon source and citrate as the stabilizing agent. The effect factors of the formation of aluminum sol,such as the mol ratio of aluminum nitrate and citrate （N/C）,temperature and time for maintaining the temperature are analyzed and the proper preparation parameters for the aluminum sol was determined to be 3：1 of N/C ratio,100℃ and lh for maintaining the temperature. KRD results showed that the alumina sample sintered at 1200℃ for 2h consisted of α-Al2O3 phase and the mullite sample sintered at 1200℃ for 2h was mainly composed of orthorhombic mullite phase. SEM results displayed that the obtained powders were irregular and the aggregation of the powders was caused by the high temperature.