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首页> 外文期刊>Separation and Purification Technology >Effect of Si content on separation and purification of the primary Si phase from hypereutectic Al-Si alloy using rotating magnetic field
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Effect of Si content on separation and purification of the primary Si phase from hypereutectic Al-Si alloy using rotating magnetic field

机译：Si含量对旋转磁场下过共晶Al-Si合金中初生Si相的分离和纯化的影响

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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.
机译：在本研究中，研究了使用旋转磁场（RMF），Si含量对过共晶Al-Si合金中初生Si相的分离和纯化的影响。结果表明，Si含量对样品周围形成的富Si层的厚度和纯化Si中的杂质含量有明显的影响。随着过共晶Al-Si合金的Si含量的增加，富Si层的厚度增加并且富Si层中的Si含量降低。可以将纯化的Si的杂质含量降低到非常低的水平。典型的金属杂质（Fe，Ti和Ca）具有很高的去除率。电子探针微分析仪（EPMA）分析清楚地表明，初生Si相中的B含量低于Al-Si共晶中的B含量，表明在凝固过程中B元素在初生Si相和剩余液体之间的偏析。另外，由于Al-Si熔体的Si含量增加，B和金属杂质（Fe，Ti和Ca）的含量由于在更高的温度下以更高的Si含量开始的偏析过程而增加。 （C）2015 Elsevier B.V.保留所有权利。

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