摘要
用正硅酸乙酯、硝酸铝为原料，采用溶胶－凝胶工艺制备了Ａｌ＿２Ｏ＿３－ＳｉＯ＿２干凝胶，通过高温热处理制得了直径为０．５～２．５μｍ，长径比为５～４０的莫来石晶须。采用ＸＲＤ，ＳＥＭ，ＴＥＭ和ＳＡＤＰ等手段研究了莫来石晶须的晶相组成、形貌与生长方向，发现莫来石晶须是沿其ｃ轴方向生长的。用４ｍｏｌ／ＬＮＨ＿３·Ｈ＿２Ｏ催化的Ａｌ＿２Ｏ＿３－ＳｉＯ＿２溶胶的凝胶化时间越短，经高温热处理后莫来石晶须含量越高。
the reagents of tetraethoxysilane and aluminium nitrate were used as starting materials to prepare Al_2O_3-SiO_2 xerogels by sol-gel method. Mullite whiskers about 0.5～2.5μm in diameter and 5～40 in aspact ratio were obtained after firing at high temperature,By means of XRD,SEM,SADP and TEM,crystalline phase,morphology and growth direction of mullite whiskers were observed. From the experimental results , the whiskers grow along the c-axis direction ([001] direction).The less the gelation time of Al_2O_3 -SiO_2 solution catalyzed by 4 mol/L NH_3·H_2O, the higher the content of mullite whiskers obtained.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1996年第3期342-346,共5页
Journal of The Chinese Ceramic Society
基金
华东理工大学测试基金
