Preparation and characterization of SiC nanowires and nanoparticles from filter paper by sol–gel and carbothermal reduction processing |
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Authors: | Wei Wang ZhiHao Jin Tao Xue GangBin Yang GuanJun Qiao |
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Affiliation: | (1) State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xian, 710049, P.R. China |
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Abstract: | The carbothermal reduction of SiO2 gel containing filter paper (as carbon precursors) in argon was used to prepare SiC nanowires and nanoparticles. The resulting
SiC ceramic, as well as the conversion mechanism of carbon/silica composites to SiC nanowires and nanoparticles, have been
investigated by scanning electron microscopy (SEM), Transmission electron microscopy (TEM), x-ray diffraction (XRD), Fourier
transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TG) techniques. XRD and IR studies show that the materials,
obtained from reaction at 1550 °C for 1 h in static argon atmosphere, are β-SiC. SEM and TEM reveal that SiC nanowires is
single crystal wires with diameters ranging from 50–200 nm and their lengths over several tens of microns. According to thermodynamic
analysis, SiC nanowires and SiC nanoparticles in the resulting SiC ceramic are formed by gas-gas reaction of SiO (g) and CO
(g). |
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Keywords: | |
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