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论文类型：期刊论文

发表时间：2015-03-04

发表刊物：SEPARATION AND PURIFICATION TECHNOLOGY

收录刊物：SCIE、EI

卷号：142

页面范围：101-107

ISSN号：1383-5866

关键字：Hypereutectic Al-Si alloys; Purification; Separation; Rotating magnetic field; Solidification

摘要：Effect of Si content on separation and purification of the primary Si phase from hypereutectic Al-Si alloy using rotating magnetic field (RMF) was investigated in the present study. The results showed that the Si content has an obvious influence on the thickness of Si-rich layer formed around the sample and impurity contents in the purified Si. The thickness of Si-rich layer increases and the Si content in the Si-rich layer decreases with increasing Si content of the hypereutectic Al-Si alloy. The impurity contents of the purified Si can be reduced to a very low level. The typical metallic impurities (Fe, Ti, and Ca) have a high removal fraction. Electron probe microanalyzer (EPMA) analysis clearly reveals that the B content is lower in the primary Si phase than that in the Al-Si eutectic, suggesting the segregation of B element between the primary Si phase and the remaining liquid during solidification. In addition, the contents of B and metallic impurities (Fe, Ti and Ca) increase with increasing Si content of the Al-Si melt due to the segregation process starting at higher temperatures with higher Si content. (C) 2015 Elsevier B.V. All rights reserved.