高岭土为原料熔盐法制备莫来石晶须

Preparation of Mullite Whiskers from Kaolin by Molten Salt Method

摘要: 以高岭土和硫酸铝为主要原料，硫酸钠为反应介质，采用熔盐法制备了莫来石晶须；系统分析了反应温度、焙烧时间以及反应介质对合成产物结构和形貌的影响。研究结果表明：1000℃保温2 h为最佳反应温度和时间，添加部分氟化铝制备出了长度 > 1 μm的莫来石晶须，50%为最佳熔盐用量。

Abstract: Mullite whiskers were prepared by molten salt method using kaolin and aluminum sulfate as the main raw materials and sodium sulfate as the reaction medium. The effects of the reaction temperature, roasting time and the reaction medium on the synthetic product structure and morphology were systematically analyzed. The experimental results show that 1000℃ insulation 2 h is the optimal reaction temperature and time. Some mullite whiskers were prepared with a length of >1 μm, and 50% is the best molten salt amount.