期刊
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
卷 17, 期 1, 页码 12-19出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14686996.2016.1140303
关键词
Electromagnetic solidification refining; Al-Si solvent; silicon purification; hafnium addition; boron removal
资金
- National Natural Science Foundation of China [51504118, 51574133]
A small amount of Hf was employed as a new additive to improve B removal in the electromagnetic solidification refinement of Si with an Al-Si melt, because Hf has a very strong affinity for B. The segregation ratio of Hf between the solid Si and Al-Si melt was estimated to range from 4.9 x 10(-6) to 8.8 x 10(-7) for Al concentrations of 0 to 64 at.%, respectively. The activity coefficient of Hf in solid Si at its infinite dilution was also estimated. A small addition of Hf (<1025 parts per million atoms, ppma) significantly improved the B removal. It was confirmed that the use of an increased Hf addition, slower cooling rate, and Al-rich Al-Si melt as the refining solvent removed B more efficiently. B in Si could be removed as much as 98.2% with 410 ppma Hf addition when the liquidus temperature of the Al-Si melt was 1173 K and the cooling rate was 4.5-7.6 K min(-1). The B content in Si could be controlled from 153 ppma to 2.7 ppma, which meets the acceptable level for solar-grade Si.
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