Synthesis and Characterization of Nanoscale Mullite Powder

被引：0
|
作者：
ZHAO Huizhong HU Shoutian
机构：
来源：
China's Refractories | 2003年 / 04期
关键词：
Nanosized mullite; Sol-Gel; Supercritical fluid drying; Synthesis; Calcinations;
D O I：
暂无
中图分类号：
TQ560 [一般性的问题。];
学科分类号：
0817 ;
摘要：
Nanoscale mullite powder were synthesized via Sol-gel-SCFD and middle temperature treatment by using AIP( aluminum-isopropoxde) and TEOS ( tetraethyl orthosili-cate) as starting materials. Both of the binary aerogel of alumina-silica and calcined nanoscale materials were investigated by using TG-DSC ( thermogravimetry-differentialscanning calorimeter) , TEM( transmission electron microscope) , XRD(X-Ray diffractometer ) and specific surfacearea and porosimetry. TG-DSC indicated the removal of most of the volatiles, i.e. 15.98% up to about 700℃ ,and in the DSC curve , existence of two exothermic peak atabout 445℃ and 1015℃ may be due to the crystallizationof Si-O-Al-O in diphasic gels and mullitization and a small endothermic peak at about 805℃ indicated the decomposition of structural water molecules . On the colligation of the results of TG-DSC, XRD and TEM, the beginning temperature of mullitization in Al2O3-SiO2 aerogel system can be confirmed at about 1015℃. XRD results also showed the formatio
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页码：20 / 24
页数：5
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