Synthesis and characterization of polymer-derived nanocrystal SiOC powders via high temperature XRD method

Year 2023, Issue: 055, 161 - 172, 31.12.2023

Sait Altun Hasan Göçmez

https://doi.org/10.59313/jsr-a.1399368

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.

Keywords

Polymer Derived Ceramics, SiOC, PDMS, High Temperature XRD

Thanks

This study is derived from the author's master's thesis on the Synthesis and Characterization of Polymer Derived Nanocrystalline SiOC Powders. We would like to thank Kütahya Dumlupınar University Advanced Technologies Center and analysis supervisors for their great help in carrying out the analyses used in experimental studies.

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