Synthesis of SiC Nanowires with In-Situ Deposition of Carbon Coating
SiC nanowires are effective reinforcement materials in ceramic matrix composites. A compliant coating such as carbon on nanowires is necessary in order to moderate the nanowire/matrix interfacial bounding for taking the most advantages of SiC nanowires. SiC nanowires with an in-situ deposition of carbon shell coating were fabricated by a novel chemical vapor growth process. Highresolution transmission electron microscopy examinations showed that the nanowires consisted of a single crystal β-SiC core with an amorphous carbon shell 2–5 nm in thickness. The nanowires were straight with a length generally over 10 μm and a diameter 15–150 nm. The growth direction of the core SiC nanowires is 〈111〉. A simple three-step growth model for SiC nanowires was proposed based on a vapor–solid growth mechanism. Because the carbon-coated nanowires were grown directly on continuous Tyranno-SA SiC fibers, in-situ application of the present technique on the fabrication of SiC nanowire-reinforced SiC/SiC composites is expected.
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Document Type: Research Article
Publication date: 2005-02-01
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