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冯东,任全兴,姜岩,茹红强,王伟,张翠萍,赵世伟,秦肇伯.SiC粉体中Fe元素的赋存形态及其提纯工艺[J].稀有金属材料与工程(英文),2020,49(2):644~649.[Feng Dong,Ren Quanxing,Jiang Yan,Ru Hongqiang,Wang Wei,Zhang Cuiping,Zhao Shiwei and Qin Zhaobo.Morphology of Fe element and the purification technology of silicon carbide powders[J].Rare Metal Materials and Engineering,2020,49(2):644~649.]
Morphology of Fe element and the purification technology of silicon carbide powders
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Received:April 02, 2019  Revised:April 28, 2019
DOI:
Key words: Silicon carbide  Fe element  Microstructures  Purification technology
Foundation item:国家重点研发计划(2017YFB0310300);国家自然科学基金(51772048,51602041);装备预先研究项目(41422010905,41422010903)
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Feng Dong,Ren Quanxing,Jiang Yan,Ru Hongqiang,Wang Wei,Zhang Cuiping,Zhao Shiwei and Qin Zhaobo  
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Abstract:
      In order to explore the morphology of Fe element in silicon carbide (SiC) block and the purification technology of SiC powders. The SiC block and powders were used as the main raw materials, respectively. HCl, HNO3, H2SO4 and HF were used as pickling agents, respectively. The phase composition, microstructures and Fe element content of SiC block and powders before and after pickling were characterized by X-ray diffraction, scanning electron microscopy and ICP, respectively. The morphology of Fe element in SiC block under microscopic state and the purification technology of SiC powders were investigated. The results indicated that Fe element existed in the form of FexSiy solid solution inside the SiC block. It could be seen that Fe element wrapped by free Si in the microscopic state. When the liquid solid ratio about 5:1, the optimum purification technology were considered as follows: The concentration of HF 0.15 mol/L, pickling temperature 70 °C and leaching time 2 h, the removal rate of Fe element could reach 94.1% under this pickling technology.