莫来石晶须的合成与分散

On the Synthesis and Dispersion of Mullite Whiskers

本文以γ-Al_2O_3和SiO_2为主要原料,Al F_3·3H_2O为助剂,采用固相反应法制备了莫来石晶须,对影响莫来石晶须长径比的主要因素(保温时间、烧结温度、氟化铝含量)进行了3因素4水平正交实验,并对实验结果进行了极差分析和方差分析,确定了影响因素的主次、显著性及最优方案。此外,从分散剂和酸腐蚀的影响两方面研究了制备的莫来石晶须的分散性能,获得了较优的晶须分散工艺。

Mullite whiskers were synthesized through solid reaction method using γ-Al2O3 and SiO2 as raw materials and AlF3.3H2O as additive. Three main factors, calcining temperature, holding time and AlF3.3H2O content, which affect the aspect ratio of the mullite whiskers were considered in an orthogonality test. The order, significance and optimal parameters for preparing mullite whiskers were determined through range analysis and variance analysis based on the orthogonality experiment results, and then the optimal parameters combination was also verified by test. The optimal dispersion parameters were obtained through studying on dispersant and acid etching which influenced the disperstiveness of the prepared mullite whiskers.