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Removal of Phosphorus in Silicon by the Formation of CaAl2Si2 Phase at the Solidification Interface
Sun, Liyuan; Wang, Zhi; Chen, Hang; Wang, Dong; Qian, Guoyu
2017
Source PublicationMETALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
ISSN1073-5615
Volume48Issue:00Pages:420
Abstract

To fully understand the role of CaAl2Si2 phase in concentrating the non-metallic impurity phosphorus, an experiment of directional solidification of Al-70 at. pct Si alloy with extreme small lowering rate 0.05 mm min(-1) was carried out. With good dynamic condition for the diffusion of impurity (Ca, Al, P) from silicon to the S/L interface, the CaAl2Si2 phase with 0.6-0.7 at. pct P was successfully observed by Electron Probe Micro Analyzer (EPMA), and its distribution character was originally presented. This impurity phase was widely detected in the refined sample but only at the interface of silicon crystal and Al-Si alloy which contributed to the deep removal of impurity P. The formation mechanism of CaAl2Si2-P phase was thus explored, in which the microsegregation and concentration of element P, Ca, Al in front of S/L interface were crucial. After acid leaching, the P content decreased from the original 23 ppm to below 5 ppm. Compared with normal solidification, a 16 pct higher removal efficiency of P was obtained in this study. (C) The Minerals, Metals & Materials Society and ASM International 2016

KeywordMetallurgical-grade Silicon Si-al Melt Sn-si Calcium Purification Enrichment Titanium System Boron
SubtypeArticle
DOI10.1007/s11663-016-0848-x
WOS IDWOS:000392295500042
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/23532
Collection研究所(批量导入)
Corresponding AuthorWang, Zhi
Recommended Citation
GB/T 7714
Sun, Liyuan,Wang, Zhi,Chen, Hang,et al. Removal of Phosphorus in Silicon by the Formation of CaAl2Si2 Phase at the Solidification Interface[J]. METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE,2017,48(00):420.
APA Sun, Liyuan,Wang, Zhi,Chen, Hang,Wang, Dong,&Qian, Guoyu.(2017).Removal of Phosphorus in Silicon by the Formation of CaAl2Si2 Phase at the Solidification Interface.METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE,48(00),420.
MLA Sun, Liyuan,et al."Removal of Phosphorus in Silicon by the Formation of CaAl2Si2 Phase at the Solidification Interface".METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE 48.00(2017):420.
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