| Purity of SiC powders fabricated by coat-mix |
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| 作者单位： | Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
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| 基金项目： | 国家自然科学基金，the Key Faculty Support Program of Tsinghua University |
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| 摘 要： |
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| 关 键 词： | 碳化硅微粉 纯度 粉体制备 酚醛树脂 烧结温度 大衣 摩尔比 粉体合成 |
Purity of SiC powders fabricated by coat-mix |
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| Authors: | Li-min Shi Hong-sheng Zhao Chun-he Tang |
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| Affiliation: | Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China |
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| Abstract: | 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 carbide is based on the liquid-solid reaction, and high purity (99.8wt%) silicon carbide powders can easily be obtained.It can also be fotmd that the optimum molar ratio of resin-derived carbon to silicon is 1:1. |
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| Keywords: | silicon carbide powders coat-mix purity |
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