Abstract
In the study, polymer-derived SiOC powders was synthesized by sol-gel method. The resulting composites consists of β-SiO2, SiC and free carbon. Tetraethylorthosilicate (TEOS) and Polydimethylsiloxane (PDMS) were selected as starting materials to obtain organic-inorganic structure. After the gelling process, the powders were heat treated at 1100°C in Argon medium to obtain the desired phases. Scanning Electron Microscopy (SEM), Differential Thermal Analysis (DTA) and Fourier Transform Infrared Spectroscopy (FT-IR) analyses were used for characterization. In addition, instant phase changes were determined by high-temperature XRD in powders subjected to heat treatment up to 1500 °C in a helium environment. The effect of temperatures on the transformation in SiOC synthesis, the transformation temperatures of α-cristobalite to β-cristobalite were sharply determined and the SiC formation temperature was revealed. The effect of temperature on crystal size was also obtained as a result of the study.
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