Polymer-derived silicon carbide micro powders through selective solvent precipitation of high molecular weight polycarbosilane.

Santhana Krishnan, G and Ramcharan, T and Ramachandra Rao, R and Naveen, S (2021) Polymer-derived silicon carbide micro powders through selective solvent precipitation of high molecular weight polycarbosilane. Ceramics International, 47 (12). pp. 17502-17509. ISSN 02728842

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Official URL: https://www.sciencedirect.com/science/article/pii/...

Abstract

Synthetic route to β-SiC micro powders through selective solvent precipitation (SSP) of high-molecular-weight (HMF) polycarbosilane. (PCS) was developed. PCS (>3000 Da) was obtained through pyrolysis polycondensation of Polydimethylsilane. Spectral data confirmed that PCS could be fractionated and precipitated during the process without disturbing its molecular structure. Fractionated fine PCS powders were converted into crystalline β-SiC particles through ceramization at 1200–1450 °C under argon. XRD patterns revealed a strong and sharp peak at a diffraction angle of 35.8°, thereby confirm the β-SiC structure and purity. SEM analysis confirmed the particle morphology and aggregation of β-SiC particles. Particle size analysis results show that the SiC particles' size is in the range of 10–100 μm. Thermal data prove the high thermal stability of PCS-HMF. β-SiC particles were thermally inert up to 1000 °C and became reactive beyond 1000 °C.

Item Type: Article
Uncontrolled Keywords: Solvent fractionation, Micro powders, High molecular weight polycarbosilane, Particle size, β-SiC micro powders
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
CHEMISTRY AND MATERIALS > Composite Materials
Depositing User: Mrs. Usha Kumari
Date Deposited: 22 Jul 2022 12:03
Last Modified: 22 Jul 2022 12:03
URI: http://nal-ir.nal.res.in/id/eprint/13576

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