Metallic Silicon Powder Produced by Vacuum Decomposition of Magnesium Silicide Prepared by Magnesiothermic Reduction

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  • Hwang Seon-Min
    Department of Materials Science and Engineering, Pusan National University Titanium Department, Korea Institute of Materials Science (KIMS)
  • Park Su-Jin
    Department of Materials Science and Engineering, Pusan National University Titanium Department, Korea Institute of Materials Science (KIMS)
  • Kim Gwang-Tae
    Titanium Department, Korea Institute of Materials Science (KIMS)
  • Kim Ha-Neul
    Titanium Department, Korea Institute of Materials Science (KIMS)
  • Ko Jae-Woong
    Titanium Department, Korea Institute of Materials Science (KIMS)
  • Park Yong-Ho
    Department of Materials Science and Engineering, Pusan National University
  • Lee Dong-Won
    Titanium Department, Korea Institute of Materials Science (KIMS)

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<p>Metallic silicon powder has been widely used for the production of various industrial materials and parts such as refractory ceramics, solar cells, military parts and so on. Herein, we attempted to prepare pure silicon powder from SiO2 by a magnesium thermal reduction process. A mixed-phase, Mg2Si + MgO, was obtained by the reduction of SiO2 powder by magnesium gas at 1223 K for 20 h. To extract pure silicon powder, Mg was separated by evaporation under vacuum through Mg2Si decomposition above 1073 K, leading to the formation of Si + MgO, and the MgO by-product was eliminated by dissolution in an aqueous hydrochloric acid solution. X-ray diffraction analysis confirmed the formation of pure Si powder and particle size shown in microstructure and oxygen content were analyzed to be 1∼5 µm and 1.5∼6 wt.%, respectively.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 62 (9), 1285-1290, 2021-09-01

    公益社団法人 日本金属学会

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