摘要
本文介绍了超微莫来石粉末制备新工艺。选用结晶氯化铝和正硅酸乙酯为原料,采用水解-沉淀工艺制取凝胶,干燥后经1000℃煅烧获得粉末,其Al_2O_3/SiO_2比与设定组成比偏差为-1％左右,杂质含量约0.1wt％。利用正交设计优化的工艺参数是:沉淀反应初期pH为3.0,快速沉淀反应时间为10min,回流陈化温度为70℃。粉末性能达到:粉末压缩比为5.29,BET当量球径为6nm,1600℃、4h烧结试样相对密度达99％以上。
Ultra-fine mullite powder was prepared by using crystal aluminum trichloride and ethyl silicate as raw materials and a new hydrolysis-precipitation technique. After drying and calcining at 1000℃ for 1h, the error of Al_2O_3/SiO_2 ratio of the powder obtained is about-1％when compared with the designed value. The total impurity eontent of the powder is about 0.1wt％.In the initial period of precipitation the parameters used in orthogonal design for optimization are pH=3; duration of accelerated precipitation is 10 min; and the ageing temperature of the flowing reflux process is 70℃.The experimental results show that the compaction ratio of the Al_2O_3-SiO_2 powder is 5.29, the equivalent diameter performed by BET is 6nm; and the relative density of the specimens sintered at 1600℃ for 4h is more than 99％.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1991年第1期80-85,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金
