Influence of La₂O₃ on crystallization behavior of free-fluoride mould flux and heat transfer of slag films

详细信息    查看全文

• 作者：Fang ZHANG^a ; ^{zhangfang2006322@163.com} ; Yuan CHEN^b ; Yici WANG^a ; Fang DONG^a ; Meiqiang WU^a
• 关键词：La₂O₃ ; free-fluoride mould flux ; crystallization property ; heat transfer ; slag film ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2011
• 出版时间：February 2011
• 年：2011
• 卷：29
• 期：2
• 页码：173-177
• 全文大小：1114 K

文摘

In order to research the influence of La₂O₃ on crystallization behavior of free-fluoride mould flux and the heat transfer of slag film, free-fluoride mould flux with various La₂O₃ content were investigated by using self-made mould simulator, comprehensive thermal analyzer and SEM-EDS. With the increase of La₂O₃ content from 0 % to 20 % , the crystallization ratios of mould flux films were improved from 2 % to 90 % and the thicknesses of films were also enhanced over two times. Moreover, crystallization temperature was greatly raised and its increasing extent reached 100 °C. It could also decrease the melting temperature of casting powder about 50 °C. However, the undissolved La₂O₃ particles appeared in slag film if the ratio of La₂O₃ in free-fluoride mould flux was much too high.