巨建涛,杨康帅,棘广恒,朱智洪.电渣重熔中TiO2对低氟CaF2-CaO-Al2O3-MgO-Li2O渣黏度和结构的影响[J].稀有金属材料与工程,2020,(11):-.[Ju Jiantao,Yang Kangshuai,Ji Guangheng,Zhu Zhihong.Effect of TiO2 on the Viscosity and Structure of Low-fluoride CaF2-CaO-Al2O3-MgO-Li2O Slag for Electroslag Remelting[J].Rare Metal Materials and Engineering,2020,(11):-].
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电渣重熔中TiO2对低氟CaF2-CaO-Al2O3-MgO-Li2O渣黏度和结构的影响
投稿时间:2020-04-26  修订日期:2020-06-09
中文关键词:  电渣重熔  低氟渣  傅里叶变换红外光谱  拉曼光谱
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      本文研究了连续冷却条件下电渣重熔中TiO2对低氟CaF2-CaO-Al2O3-MgO-Li2O渣黏度的影响,并利用傅里叶变换红外光谱和拉曼光谱分析水淬渣和对应结构的关系。结果表明,渣的黏度随着TiO2的增加而降低,当TiO2含量达到13.1%,随着温度从1743K, 1793K, 1843K 增加至1893K时, 对应黏度从0.067 Pa?s, 0.059 Pa?s, 0.056 Pa?s 降低到0.054 Pa?s;当温度达到1843K或之上时,TiO2的加入对降低黏度有较小的影响。随着TiO2含量从0,4.3%,8.7%增加至13.1%,黏流活化能从58.0 kJ/mol,47.7 kJ/mol,42.8 kJ/mol降低到38.6 kJ/mol。此外,红外光谱结果表明,随着TiO2的加入,渣中[AlOnF4-n]-四面体络合物和[AlO4]-四面体网状结构被解聚,但[AlO6]-八面体结构没有发现;同时,拉曼光谱分析表明,TiO2加入可解聚[AlO4]-四面体网状结构中Al-O-Al键, 并且Q4单元转化为Q2单元,同时形成O-Ti-O和Ti-O-Ti键。这些结果都表明TiO2可降低渣的聚合度,并且有利于渣的结构简单化。最终,黏度变化与渣的对应结构有很好的一致性。
Effect of TiO2 on the Viscosity and Structure of Low-fluoride CaF2-CaO-Al2O3-MgO-Li2O Slag for Electroslag Remelting
英文关键词:electroslag remelting  low-fluoride slag  FTIR  Raman spectra
英文摘要:
      The effect of TiO2 on viscosity of low-fluoride CaF2-CaO-Al2O3-MgO-Li2O slag for electroslag remelting was investigated under the continuous cooling conditions and the FTIR and the Raman spectroscopy were employed to analyze the correction between the quenched slags and the corresponding structure in the study. It can be found that the slag viscosity lowers as gradually increasing TiO2 content, and when TiO2 content up to 13.1%, the corresponding viscosity values slowly decrease from 0.067 Pa?s, 0.059 Pa?s, 0.056 Pa?s to 0.054 Pa?s with the temperature increases from 1743 K, 1793 K, 1843 K to 1893 K and at higher temperature of 1843 K and above, TiO2 addition has only a relatively small effect on lowering the slag viscosity. The calculated activation energy of viscous flow decreases from 58.0 kJ/mol, 47.7 kJ/mol, 42.8 kJ/mol to 38.6 kJ/mol as increasing TiO2 content from 0, 4.3%, 8.7% to 13.1%. Additionally, the FTIR results reveal that with the addition of TiO2, [AlOnF4-n]-tetrahedral complexes and [AlO4]-tetrahedra network structures depolymerized, but [AlO6]-octahedra is not found in the slag. Simultaneously, it can be seen by Raman analysis that with the addition of TiO2, leading to the depolymerization of the Al-O-Al linkage in the [AlO4]-tetrahedra network structures, the transformation of part Q4 units to Q2 units, and the forms of O-Ti-O and Ti-O-Ti chains. These results suggest that polymerization degree of these slags decreases as increasing TiO2 content, which is beneficial to simplify slag structure. Finally, the changed slag structure is in good agreement with the slag corresponding to the varying viscosity.
作者单位
巨建涛 西安建筑科技大学,陕西 
杨康帅 西安建筑科技大学,陕西 
棘广恒 西安建筑科技大学,陕西 
朱智洪 西安建筑科技大学,陕西 
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