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Sol-Gel Route to Barium Aluminosilicate (BAS) Glass-Ceramics

ZHANG Bo(State Key Lab for P/M, Central South University Changsha 410083 China)ZHANG Li-Tong; ZHOU Wan-Cheng(State Key Lab of Solidification Processing, Northwestern Polytechnical UniversityXi'an 710072 China)  
A new idea was proposed for solving the problems caused by different hydrolysis rate of alkoxides in Sol-Gel processes. The new idea is that the highest-hydrolysis-rate alkoxide is supposed to be hydrolysized slowly and homogeneously at first under a controllable condition, and meanal-bile,its hydrolysis intermediates polymerize with lower-hydrolysis-rate alkoxides. Based on this neal.idea, a Sol-Gel process with lower cost and a simple procedure was developed for synthesizing BAS glass-ceramics. XRD, DTA and Laser Raman Spectrum were used to detect the molecular structures and crystallization behaviors of a gel and a gel-derived glass. The as-prepared gel is amorphous with (Si, Al)-O network structures. The temperature of maximum-nucleation-rate of the amorphous is about 938℃, and the temperature of maximum-crystal-growth is about 1164℃.
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