Boron and Phosphorus Removal During High Purity Hypereutectic Al–Si Solidification

다국어 초록 (Multilingual Abstract)

Al–Si solvent refining is a promising process for silicon purification, and the key impurity elements are boron and phosphorus.
Thermodynamic calculation and experiments in particular temperatures show that boron and phosphorus segregationcoefficients in Al–Si melt decrease with decreasing temperature, and it is not verified in traditional solidification. In orderto character boron and phosphorus removal in Al–Si solidification over a temperature range, high purity hypereutecticAl–Si melts were solidified at relatively low cooling rate. It is found that boron and phosphorus removal rates increase withdecreasing temperature. The tread that the boron and phosphorus segregation coefficients in the Al–Si melt decease withdecreasing temperature is confirmed in solidification over a temperature range. In addition, aluminum content in purifiedsilicon is close to the maximum solid solubility of aluminum in silicon.

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