摘要
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。
To separate primary Si from Si-Al-Sn alloy, directional solidification method was applied in this study. The effects and mechanisms of the cooling rate, alloy composition, and G/R ratio on bulk Si growth were investigated for optimizing parameters. By using of the constitutional supercooling criterion for single-phase growth from melts, the effects of Sn addition have been explored as compared with Si-Al and Si-Sn alloys. Finally, with the application of electron probe micro analyzer, the microstructure of Si and the distribution of Al and Sn were analyzed. Based on the obtained results, the directional solidification method is verified to be an effective method to separate Si from Si-Al-Sn alloy without any metal inclusions. The contents of Al and Sn in bulk Si are almost equivalent to the corresponding solid solubility. The obtained results indicate that directional solidification method can be an appropriate and effective technique to separate Si from alloy.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2016年第8期791-796,共6页
Journal of Inorganic Materials
基金
国家自然科学基金(51334002,51274034,51404019)
中国博士后科学基金(2015M580985)~~
作者简介
李亚琼（1983-），女，博士．E-mail：liyq_ustb@163．com
张立峰，教授．E-mail：zhanglifcng@ustb．edu．cn
