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- Title
Metallic Silicon Powder Produced by Vacuum Decomposition of Magnesium Silicide Prepared by Magnesiothermic Reduction.
- Authors
Seon-Min Hwang; Su-Jin Park; Gwang-Tae Kim; Ha-Neul Kim; Jae-Woong Ko; Yong-Ho Park; Dong-Won Lee
- Abstract
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 1223K 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.
- Subjects
SILICON compounds; MAGNESIUM metallurgy; MAGNESIUM oxide; SILICA; HYDROCHLORIC acid
- Publication
Materials Transactions, 2021, Vol 62, Issue 9, p1285
- ISSN
1345-9678
- Publication type
Article
- DOI
10.2320/matertrans.MT-M2020396