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材料工程  2015 

熔盐电解-区域熔炼法制备太阳能级硅的工艺研究

DOI: 10.11868/j.issn.1001-4381.2015.04.013, PP. 73-78

Keywords: 高纯石英粉,熔盐电解,太阳能级硅,区域熔炼

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Abstract:

以高纯石英为原料,石墨坩埚和钨为电极材料,在CaCl2-LiCl混合熔盐(摩尔比91)中电解制备Ca-Si合金,经区域熔炼提纯制得太阳能级硅(SG-Si)。用XRD,SEM和ICP-MS对电解合金及提纯后产物进行表征和含量分析。结果表明在电解槽电压2.6V、温度850℃的条件下,产物为Ca-Si合金。经过两次区域熔炼提纯后,硅锭85%以上的区域纯度接近99.9999%,符合SG-Si的要求。

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