3、H2SO4和HF作為酸洗劑。通過XRD、SEM和ICP等檢測(cè)手段對(duì)SiC塊體和酸洗前后粉體的物相組成、微觀結(jié)構(gòu)及Fe元素含量進(jìn)行表征,重點(diǎn)研究微觀狀態(tài)下SiC中Fe元素的賦存形態(tài)及其酸洗提純工藝。結(jié)果表明：Fe元素以FexSiy固溶體的形式賦存于SiC塊體的內(nèi)部,并且微觀狀態(tài)下呈現(xiàn)出被游離Si所包裹的形態(tài)；當(dāng)控制液固比為5:1時(shí),最佳酸洗的工藝參數(shù)為：HF濃度0.15 mol/L,浸出溫度70 ℃,浸出時(shí)間2 h,在此工藝下Fe元素的去除率可達(dá)94.1%。"/>

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SiC粉體中Fe元素的賦存形態(tài)及其提純工藝
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東北大學(xué) 材料各向異性與織構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室

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TQ174

基金項(xiàng)目:

國家重點(diǎn)研發(fā)計(jì)劃（2017YFB0310300）；國家自然科學(xué)基金（51772048，51602041）；裝備預(yù)先研究項(xiàng)目(41422010905，41422010903)


Morphology of Fe element and the purification technology of silicon carbide powders
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Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University

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    摘要:

    為了探究SiC塊體中Fe元素的賦存形態(tài)及其粉體純化機(jī)制,分別以冶煉后SiC塊體以及經(jīng)氣流磨破碎后的粉體為主要原料,HCl、HNO3、H2SO4和HF作為酸洗劑。通過XRD、SEM和ICP等檢測(cè)手段對(duì)SiC塊體和酸洗前后粉體的物相組成、微觀結(jié)構(gòu)及Fe元素含量進(jìn)行表征,重點(diǎn)研究微觀狀態(tài)下SiC中Fe元素的賦存形態(tài)及其酸洗提純工藝。結(jié)果表明：Fe元素以FexSiy固溶體的形式賦存于SiC塊體的內(nèi)部,并且微觀狀態(tài)下呈現(xiàn)出被游離Si所包裹的形態(tài)；當(dāng)控制液固比為5:1時(shí),最佳酸洗的工藝參數(shù)為：HF濃度0.15 mol/L,浸出溫度70 ℃,浸出時(shí)間2 h,在此工藝下Fe元素的去除率可達(dá)94.1%。

    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.

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馮東,任全興,姜巖,茹紅強(qiáng),王偉,張翠萍,趙世偉,秦肇伯. SiC粉體中Fe元素的賦存形態(tài)及其提純工藝[J].稀有金屬材料與工程,2020,49(2):644~649.[Feng Dong, Ren Quanxing, Jiang Yan, Ru Hongqiang, Wang Wei, Zhang Cuiping, Zhao Shiwei, 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.]
DOI：10.12442/j. issn.1002-185X. QH20190049

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  • 收稿日期:2019-04-02
  • 最后修改日期:2019-04-28
  • 錄用日期:2019-10-23
  • 在線發(fā)布日期: 2020-03-12
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