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《Journal of the Chinese Ceramic Society》 2006-11
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PREPARATION OF SPHERE-LIKE SUBMICRON SILICON CARBIDE POWDER

SHI Limin,ZHAO Hongsheng,YAN Yinghui,LI Ziqiang,TANG Chunhe (Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 102201, China)  
A spherical submicron silicon carbide powder was prepared by carbonizing and calcining the precursor powder fabricated by coating phenolic resin on the surface of silicon powder through a coat mixing process. The obtained spherical silicon carbide pow-der has a narrow and uniform size distribution, and a mean particle size of about 0.1 μm. The formation mechanism of the submicron silicon carbide powder was investigated by analyzing the microstructure transformation. The formation process of submicron silicon carbide is as follows: (1) Silicon–carbon core–shell powder is obtained by carbonizing the precursor powder. (2) A silicon carbide shell is formed by the reaction of liquid silicon and carbon shell inner layer during sintering at 1500 ℃. (3) The silicon carbide shell is fragmented into powder under the effect of thermal stress and the attack of liquid silicon. (4) The continued repetition of the above two steps results in the formation of new layers of silicon carbide until submicron silicon carbide powder is finally formed.
【CateGory Index】: TB383.1
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