Microstructural characterization in metallurgical grade silicon after treatment by CaO-SiO2 and Na2O-SiO2 Slags
Date
2013Author
Fang, Ming
Lu, Cheng-Hao
Huang, Liu-Qing
Lai, Hui-Xian
Chen, Juan
Li, Jin-Tang
Ma, Wen-Hui
Shen, Jian-Ning
Sheng, Zhi-Lin
Luo, Xue-Tao
罗学涛
Collections
- 材料学院-会议论文 [72]
Abstract
The microstructure and impurities distribution in metallurgical grade silicon with treated by CaO-SiO2 and Na2O-SiO2 slags were investigated. An exhaustive analysis of the transformation of precipitated phase at grain boundaries has been carried out. Prior to slag treatment, Si-Fe system intermetallic was the primary precipitated phase in metalllurgical grade silicon. After treated by CaO-SiO2 slag, Si-Ca system intermetallic became the main precipitated phase, such as Si-Ca, Si-Ca-Ti, Si-Ca-Al and Si-Fe-Ca. But Na2O-SiO2 slag had another result on refining metallurgical grade silicon; only Si-Fe-Ti phase was generated in precipitated phase and the low level of sodium in treated silicon was obtained. ? (2013) Trans Tech Publications, Switzerland.