The role of carbon and SiC crystallinities in the oxidation and mechanical property improvement of hybrid nano-fibers

Saja M. Nabat Al-Ajrash, Khalid Lafdi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

In this study, electrospinning was successfully used to fabricate hybrid Carbon-Silicon Carbide (C-SiC) fibers using polyacrylonitrile (PAN) and silicon (Si) nano-particles as precursors. Silicon-to-carbon precursor ratios and heat treatment were optimized to fabricate hybrid nano-fibers with high oxidation resistance. After heat treatment, the nano-fibers showed two-dimensional ordered carbons and SiC nano-phases formation. As a result, a noticeable improvement in mechanical and thermal properties was achieved. Samples with 90 wt% PAN/10 wt% Si showed about four-time improvements in char yield as compared with 100 wt% PAN. In addition, after heat treatment of the fiber at 1250 °C, SiC was formed. The SiC phase played a major role in ordering the carbon phase. The carbon and SiC crystallinities had a great impact on the oxidation and mechanical property improvement of hybrid nanofibers. The determination of crystal size was carried out using X-ray results obtained at different temperatures and holding times. The SiC grain growth was predicted using kinetic model and its exponent was found to be around n = 4 with an activation energy around 35 KJ/mol.K. For such growth, the dominant grain growth mechanism was grain boundary diffusion.

Original languageEnglish
Pages (from-to)7286-7294
Number of pages9
JournalCeramics International
Volume45
Issue number6
DOIs
Publication statusPublished - 15 Apr 2019

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