بررسي پايداري حرارتي شيشه سيليكون اكسي كاربيد سنتز شده به روش سل - ژل

Study of High Temperature Stability of Silicon Oxycarbide Glasses Synthesized by Sol-Gel

Silicon oxycarbide glass was synthesized by cohydrolysis of a precursor composed of tetraethyl orthosilicate (TEOS) and vinyltrimethoxysilane (VTMS). The effect of heat treatment on thermal stability behavior of silicon oxycarbide glass was carefully characterized by means of different techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Thermal gravimetry analysis (TGA). Silicon oxycarbide network was amorphous up to 1300°C. By increasing the temperature up to 1400°C the amorphous network undergoes structural rearrangements that lead to the precipitation very fine particle of SiC crystallites in to amorphous silica. The FTIR results showed Si-C and Si-O band in final glass. Experimental results clearly indicate the very good high temperature stability behavior and small weight loss in superior temperature.