定向凝固技术去除超冶金级硅中铁的实验研究  

Study on Directional Solidification Technology for Removing Iron in Upgraded Metallurgical Grade Silicon

作　　者：蒋咏[1] 马文会[1] 魏奎先[1] 周阳[1] 戴永年[1] 

机构地区：[1]昆明理工大学冶金与能源工程学院真空冶金国家工程实验室,云南昆明650093

出　　处：《热加工工艺》2011年第23期17-18,21,共3页Hot Working Technology

基　　金：教育部新世纪优秀人才支持计划项目(NCET-07-0387)

摘　　要：研究了不同下拉速率对超冶金级硅中铁杂质的去除效果。结果表明,在较低的下拉速率下,对铁的去除效果最好,底部去除率高达99.45%。其原因主要在于杂质铁在凝固过程中的分凝效应及不同凝固速率。The effects of dro p-down rates on the removal of Fe in the upgraded metallurgical grade silicon were studied. The results show that under lower drop-down rate, the better removal efficiency can be obtained. When the drop-down rate is 5 μm/s, the removal efficiency for the bottom of silicon ingot is highest, to 99.45%. The main reason is the segregation effect and different solidification rates of Fe during the solidification.

关 键 词：超冶金级硅 铁 定向凝固 

分 类 号：TK511[动力工程及工程热物理—热能工程] TG249[金属学及工艺—铸造]