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Hybrid Carbon Nano-Fibers with Improved Oxidation Resistance

Department of Chemical and Materials Engineering, University of Dayton, 300 College Park, Dayton, OH 45469, USA
Author to whom correspondence should be addressed.
Ceramics 2019, 2(1), 25-33;
Received: 1 December 2018 / Revised: 29 December 2018 / Accepted: 6 January 2019 / Published: 10 January 2019
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Hybrid Carbon-Silicon Carbide (C-SiC) nano-fibers were fabricated while using a mixture of polyacrylonitrile (PAN) and silicon (Si) nanoparticles as precursors. The microstructure of the material was examined using X-ray diffraction and Raman spectroscopy as a function of processing temperature and holding time. A complete transformation of Si to SiC occurred at 1250 °C. However, for heat treatments below 1000 °C, three distinct phases, including Si, C, and SiC were present. The effect of microstructural changes, due to the heat treatment, on oxidation resistance was determined using thermogravimetric analysis (TGA). Furthermore, the char yield showed exponential growth with increasing the carbonization temperature from 850 °C to 1250 °C. The holding times at higher temperatures showed a significant increase in thermal properties because of SiC grain growth. At longer holding times, the SiC phase has the function of bothcoating and reinforcing phase. Such structural changes were related to fibers mechanical properties. The tensile strength was the highest for fiber carbonized fibers at 850 °C, while the modulus increased monotonically with increasing carbonization temperature. View Full-Text
Keywords: SiC; nanofibers; electrospinning; carbon fibers; hybrid materials SiC; nanofibers; electrospinning; carbon fibers; hybrid materials

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Al-Ajrash, S.M.N.; Lafdi, K. Hybrid Carbon Nano-Fibers with Improved Oxidation Resistance. Ceramics 2019, 2, 25-33.

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