Effect of AI_(2)O_(3)and MgO on crystallization and structure of Ca0-Si0_(2)-B_(2)0_(3)-based fluorine-free mold flux
作者机构：School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083HunanChina National Center for International Cooperation of Clean MetallurgyChangsha 41(K)83HunanChina
出 版 物：《Journal of Iron and Steel Research International》 (Journal of Iron and Steel Research, International)
年 卷 期：2021年第28卷第5期
页 面：552-562页
核心收录：
学科分类：08[工学] 0806[工学-冶金工程] 080601[工学-冶金物理化学]
基 金：This work was supported by the National Natural Science Foundation of China(51874363,U1760202) Natural Science Foundation of Hunan Province(2019JJ40345) Hunan Scientific Technology Projects(2018RS3022,2018WK2051)
主 题：Crystallization Single hot thermocouple technique Melt structure Fluorine-free mold flux
摘 要：The crytallization behavior and melt structure of the CaO-Si0^(2-)B20_(3)-based fluorine-free mold fux were *** results show that the crytallization of the mold fux was first inhibited and then promoted with the increase in Al_(2)0_(3) content from 4 to 12 wt.%.However,it was enhanced by MgO in the range of 2-10 wt.%.The results of Fourier transform infrared spectroscopy and Raman spectroscopy showed that Al_(2)0_(3) worked as a network former in the mold flux melt when its content was in the range of 4-8 wt.%,whereas it worked as the network breaker to provide 0^(2-)when its content was in the range of 8-12 wt.%.In addition,the combined efects from the charge compensation by Mg^(2+)and the network broken by 0^(2-)led to the increase in some typicalT-O-T(AI-O-A1,B-O-B,etc.,)and simpler structural units(Q^(2)(Si),B_^(O-)in the[B0_(2)0^(-)],.etc.)when the MgO content was in the range of 2-6 wt.%.The continuous increase in 0^(2-)provided by the addition of MgO from 6 to 10 wt.%further depolymerized the network of the melt and fnally caused fast crystallizationo.
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