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Synthesis of High Purity sic powder for High-resistivity sic Single Crystals Growth

Journal of Materials Science & Technology 2007年第1期23卷 118-122页

作者： Li WANG Xiaobu HU Xiangang XU Shouzheng JIANG Lina NING Minhua JIANG State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China

High purity silicon carbide （sic） powder was synthesized in-situ by chemical reaction between silicon and carbon powder. In order to ensure that the impurity concentration of the resulting sic powder is suitable for high-resistivity sic single crystal growth, the preparation technology of sic powder is different from that of sic ceramic. The influence of the shape and size of carbon particles on the morphology and phase composition of the obtained sic powder were discussed. The phase composition and morphology of the products were investigated by X-ray diffraction, Raman microspectroscopy and scanning electron microscopy. The results show that the composition of resulting sic by in-situ synthesis from Si/C mixture strongly depends on the nature of the carbon source, which corresponds to the particle size and shape, as well as the preparation temperature. In the experimental conditions, flake graphite is more suitable for the synthesis of sic powder than activated carbon because of its relatively smaller particle size and flake shape, which make the conversion more complete. The major phase composition of the full conversion products is β-sic, with traces of α-sic. Glow discharge mass spectroscopy measurements indicated that sic powder synthesized with this chemical reaction method can meet the purity demand for the growth of high-resistivity sic single crystals.

关键词： Activated carbon Flaky graphite Particle size sic powder High purity

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Ultra-fine Treatment of sic powder and Its Effect on Microstructure and Properties of sic Ceramic

Ultra-fine Treatment of SiC Powder and Its Effect on Microst...

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The 3～〔rd〕International Conference on High-Performance Ceramics(CICC-3)（2）

作者： Xingzhong Guo Hui Yang Lihua Gao and Peixin FuCenter of Nano-Science and Nano-Technology of Zhejiang University Hangzhou 310027 China Zhejiang Dongxin Seals Limited Company Leqing 325604 China

＜正＞ The ultra-fine treatment of industrial sic powder was carried out by fluidized bed opposed jet milling （QLM-100K）, and the influences of grinding parameters on the ultra-fine treatment were studied. A better grinding result is achieved through a higher crushing pressure and a higher sorter frequency and the ultra-fine treated sic powder possesses a smaller particle size, a narrower particle-size distribution, a higher specific surface area and reduced agglomeration. The effects of ultra-fine treatment on the compaction behaviors, sintering behaviors, properties and microstructure of sic ceramics were investigated. The compact with ultra-fine treated powder has a higher density and a lower sintering temperature. The densification and mechanical properties of the ceramics can be ameliorated obviously and the microstructure defects of the ceramics decrease.

关键词： sic powder Ultra-fine treatment Fluidized bed opposed jet milling Property

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Microstructure and mechanical property of A356 based composite by friction stir processing

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Transactions of Nonferrous Metals Society of China 2013年第2期23卷 335-340页

作者： Don-Hyun CHOI Yong-Hwan KIM Byung-Wook AHN Yong-Il KIM Seung-Boo JUNG School of Advanced Materials Science and Engineering Sungkyunkwan University300 Cheoncheon-dong Jangan-gu Suwon Gyeonggi-do 440-746 Korea MEPL Sungkyunkwan University 300 Cheoncheon-dong Jangan-gu Suwon Gyeonggi-do 440-746 Korea

Friction stir processing （FSP） was used to incorporate sic particles into the matrix of A356 Al alloy to form composite material. Constant tool rotation speed of 1800 r/min and travel speed of 127 mm/min were used in this study. The base metal （BM） shows the hypoeutectic Al-Si dendrite structure. The microstructure of the stir zone （SZ） is very different from that of the BM. The eutectic Si and sic particles are dispersed homogeneously in primary Al solid solution. The thermo-mechanically affected zone （TMAZ）, where the original microstructure is greatly deformed, is characterized by dispersed eutectic Si and sic particles aligned along the rotational direction of the tool. The hardness of the SZ shows higher value than that of the BM because some defects are remarkably reduced and the eutectic Si and sic particles are dispersed over the SZ.

关键词： friction stir processing A356 alloy sic powder eutectic Si

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