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Purity of SiC powders fabricated by coat-mix

International Journal of Minerals,Metallurgy and Materials 2009年第2期16卷 230-235页

作者： Li-min Shi Hong-sheng Zhao Chun-he Tang Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

Silicon carbide powders were synthesized by the coat-mix process, with phenolic resin and silicon powders as starting materials. The effects of synthetic conditions, including sintering temperature and the molar ratio of resin-derived carbon to silicon on the composition and the purity of the resultant powders were investigated. The results show that a higher sintering temperature and an appropriate molar ratio of resin-derived carbon to silicon are favorable for producing high purity silicon carbide powders. It is found that the silicon carbide content increases slightly with increasing the sintering temperature during the solid-solid reaction. The temperature gradient plays an important role on this trend. When the sintering temperature is raised up to 1500℃, the formation of silicon earbide is based on the liquid-solid reaction, and high purity （99.8wt%） silicon carbide powders can easily be obtained. It can also be found that the optimum molar ratio of resin-derived carbon to silicon is 1：1.

关键词： silicon carbide powders coat-mix purity

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Preparation and properties of porous silicon carbide ceramics through coat-mix and composite additives process

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Transactions of Nonferrous Metals Society of China 2011年第6期21卷 1329-1334页

作者：赵宏生刘中国杨阳刘小雪张凯红李自强清华大学核能与新能源技术研究院北京100084

The core-shell structure silicon-resin precursor powders were synthesized through coat-mix process and addition of Al2O3-SiO2-Y2O3 composite additives.A series of porous silicon carbide ceramics were produced after molding,carbonization and *** phase,morphology,porosity,thermal conductivity,thermal expansion coefficient,and thermal shock resistance were *** results show that porous silicon carbide ceramics can be produced at low *** grain size of porous silicon carbide ceramic is small,and the thermal conductivity is enhanced *** additives also improve the thermal shock resistance of porous *** bending strength loss rate after 30 times of thermal shock test of the porous ceramics which were added Al2O3-SiO2-Y2O3 and sintered at 1 650 ℃ is only 6.5%.Moreover,the pore inside of the sample is smooth,and the pore size distribution is *** additives make little effect on the thermal expansion coefficient of the porous silicon carbide ceramics.

关键词： silicon carbide porous ceramic coat-mix composite additives

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