Impurities evaporation from metallurgical-grade silicon in electron beam melting process
来源期刊：Rare Metals2011年第3期
论文作者：WANG Qiang, DONG Wei, TAN Yi, JIANG Dachuan, ZHANG Cong, and PENG Xu School of Materials Science and Engineering, Dalian University of Technology, Dalian , China
文章页码：274 - 277
摘 要：The purification of metallurgical-grade silicon （MG-Si） has been investigated during electron beam melting （EBM） process. The results show that the phosphorus, calcium and aluminum contents decrease significantly after melting, and magnesium is partially removed. However, no significant change in content for boron and iron has been found. Langmuir’s equation and Henry law were used to derive the removal effi-ciency for each impurity element. The free surface temperature was estimated by the Hertz-Knudsen-Langmuir equation and silicon’s vapor pressure equation. Good agreement was found between measured and calculated impurities’ removal efficiency for phosphorus, calcium and aluminum, magnesium, boron and iron. The deviation between the two results was also analyzed in depth.
WANG Qiang, DONG Wei, TAN Yi, JIANG Dachuan, ZHANG Cong, and PENG Xu School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
摘 要：The purification of metallurgical-grade silicon （MG-Si） has been investigated during electron beam melting （EBM） process. The results show that the phosphorus, calcium and aluminum contents decrease significantly after melting, and magnesium is partially removed. However, no significant change in content for boron and iron has been found. Langmuir’s equation and Henry law were used to derive the removal effi-ciency for each impurity element. The free surface temperature was estimated by the Hertz-Knudsen-Langmuir equation and silicon’s vapor pressure equation. Good agreement was found between measured and calculated impurities’ removal efficiency for phosphorus, calcium and aluminum, magnesium, boron and iron. The deviation between the two results was also analyzed in depth.
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