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The Al2O3-SiO2 glasses and ceramics has been worthy of remark as high temperature materials. However, the preparation of these glasses are actually impossible by conventional method of melting. This investigation is concerned with the preparation of dense bulk glasses in Al2O3-SiO2 system by the gel process and their thermal expansion as a function of glass composition. The composition studied were xAl2O3⋅(100-x) SiO2 where x=10-90mol% Al2O3. The Al2O3-SiO2 glasses of the dense bulk were obtained at 800°C by the gel process. The optimum condition for the preparation of dense bulk glasses was as following; the aluminum nitrate and TEOS were used as raw material and ethylene glycol was used as solvent, The thermal expansion coefficients show the values of 0.5 to 7.5×10-6K-1 and increased linearly with increasing Al2O3 content. Their expansion coefficients were controllable by changing the composition.

Synthesis of Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> Glasses from Sol-Gel Method and Their Thermal Expansion