- Impurities evaporation from metallurgical-grade silicon in electron beam melting process
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- 论文类型： 期刊论文
- 发表时间： 2011-06-01
- 发表刊物： RARE METALS
- 收录刊物： Scopus、SCIE、EI
- 卷号： 30
- 期号： 3
- 页面范围： 274-277
- ISSN号： 1001-0521
- 关键字： electron beam melting; silicon; evaporation; impurities; removal efficiency
- 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 efficiency 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.
