Hits:

Indexed by:期刊论文

Date of Publication:2016-12-15

Journal:MATERIALS LETTERS

Included Journals:SCIE、EI、Scopus

Volume:185

Page Number:59-62

ISSN No.:0167-577X

Key Words:Solidification; Segregation; Purification; Rotating magnetic field; Semi-continuous casting

Abstract:This paper reported a very simple and energy-saving method to refine metallurgical grade Si (MG-Si) for use in solar cell materials. Refined Si was prepared by using a rotating magnetic field (RMF) to separate the primary Si continuously from hypereutectic Al-30Si melt during semi-continuous casting. Purification testing of the refined Si indicates that the contents of almost all metallic elements can be reduced to the solar grade levels (<= 0.1 ppmw) by electromagnetic separation with solidification refining just twice, while those of the non-metallic impurities B and P can be effectively controlled within the acceptable levels (B < 0.3 ppmw, P < 0.5 ppmw) by solidification refining for three times. (C) 2016 Elsevier B.V. All rights reserved.