Carbothermic Synthesis of Monodispersed Spherical Si3N4/SiC Nanocomposite Powder |
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| Authors: | Jae Young Choi Chong Hee Kim Do Kyung Kim |
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| Affiliation: | Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373–1 Kusong-dong, Yusong-gu, Taejon 305–701, Korea |
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| Abstract: | The synthesis and structure of a monodispersed spherical Si3N4/SiC nanocomposite powder have been studied. The Si3N4/SiC nanocomposite powder was synthesized by heating under argon a spherical Si3N4/C powder. The spherical Si3N4/C powder was prepared by heating a spherical organosilica powder in a nitrogen atmosphere and was composed of a mixture of nanosized Si3N4 and free carbon particles. During the heat treatment at 1450°C, the Si3N4/C powder became a Si3N4/SiC composite powder and finally a SiC powder after 8 h, while retaining its spherical shape. The composition of the Si3N4/SiC composite powder changed with the duration of the heat treatment. The results of TEM, SEM, and selected area electron diffraction showed that the Si3N4/SiC composite powder was composed of homogeneously distributed nanosized Si3N4 and SiC particles. |
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