Effects of melt viscosity on enrichment and separation of primary silicon from Al-Si melt

铝硅熔体黏度对初晶硅富集和分离的影响机制

The effects of melt viscosity on the enrichment and separation of Si crystals from Al–Si melt during an electromagnetic solidification process were investigated. Both the enrichment efficiency and the separation were found to be strongly dependent on the melt viscosity. A high melt viscosity was beneficial to the enrichment of primary silicon, whereas a low melt viscosity facilitated the separation process. A new enrichment mechanism was proposed in order to clarify the influence of melt viscosity, and an improved process for achieving high-efficiency enrichment of Si crystals via control of the melt viscosity was also proposed. Additionally, the morphology of Si crystals was found to change from spheroidal to plate-like in shape owing to the difference in viscosities in different regions.

研究了铝硅合金电磁分离过程中熔体黏度对初晶硅富集和分离的影响。结果表明,熔体黏度对初晶硅的富集效率和分离有决定性的作用。高黏度熔体有利于初晶硅的富集,反之低黏度熔体可以促进初晶硅的分离。基于此,对初晶硅富集过程的机理进行了新的解释,并通过控制熔体黏度获得了一种强化初晶硅富集效率的工艺。此外,熔体不同区域黏度的差异会导致初晶硅的晶体形貌由球状转变为板片状。