Si-Al-Sn合金熔体中块体硅定向生长行为研究

无机材料学报, 2016, 31(8): 791-796. doi: 10.15541/jim20150649

Si-Al-Sn合金熔体中块体硅定向生长行为研究

李亚琼 ^1, , 李佳艳 ^2, , 谭毅 ^3, , 张立峰 ^4, , 森田一樹 ^5,

1.北京科技大学冶金与生态工程学院,北京,100083

2.大连理工大学材料科学与工程学院,大连,116024

3.大连理工大学材料科学与工程学院,大连,116024

4.北京科技大学冶金与生态工程学院,北京,100083

5.东京大学工学院,材料工程学院,日本东京1538505

基金项目: China Postdoctoral Science Foundation(2015M580985) 国家自然科学基金(51334002,51274034,51404019) 中国博士后科学基金(2015M580985)National Natural Science Foundation of China(51334002,51274034,51404019)

关键词： Si-Al-Sn合金 , 定向凝固 , 块体硅

Directional Growth of Bulk Silicon from Si-Al-Sn Melts

Keywords： Si-Al-Sn alloy , directional solidification method , bulk Si

为从Si-Al-Sn合金中有效分离初晶硅,本研究提出并实现了三元合金定向生长块体硅的技术.通过考察冷却速度、合金成分、温度梯度与晶体生长速度比值(G/R)等参数及其影响机制,确定促进块体硅稳定生长的有利条件;对比Si-Al、Si-Sn二元合金体系,采用成分过冷理论分析金属Sn对三元合金中块体硅生长行为的影响;采用电子探针显微分析仪考察块体硅微观组织形貌与杂质分布.研究结果表明:定向凝固方法能有效分离块体硅,同时抑制块体硅内金属夹杂物生成,并将杂质含量控制在其固溶度范围内,成为一种有效分离、回收高纯初晶硅的新途径.

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