• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ISIJ international >Dissolution of ZrO_2, Al_2O_3, MgO and MgAl_2O_4 Particles in a B_2O_3 Containing Commercial Fluoride-free Mould Slag
【24h】

Dissolution of ZrO_2, Al_2O_3, MgO and MgAl_2O_4 Particles in a B_2O_3 Containing Commercial Fluoride-free Mould Slag

机译：ZrO_2，Al_2O_3，MgO和MgAl_2O_4颗粒在含市售无氟铸渣中的B_2O_3中的溶解

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Non-metallic inclusions composed of ZrO_2, Al_2O_3, MgO and MgAl_2O_4 are associated with problems during the continuous casting of steels and so it is desirable that such particles dissolve completely if they appear in the slag. The dissolution behaviour of particles of these oxides in a fluorine-free slag containing 1.5wt percent B_2O_3, was studied in situ using Confocal Scanning Laser Microscopy (CSLM). The effects of particle type, initial size, and slag temperature were investigated. Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDS) was performed to chemically analyze quenched samples, in order to identify any surface reaction or diffusion layers formed. Analytical prediction models were compared to the experimental data to relate the kinetics to possible rate-limiting steps. Thermodynamic solubility limits for use in the model were determined using commercial CALPHAD based software. The dissolution rates of Al_2O_3, MgO and MgAl_2O_4 were found to be comparable to one another whereas the dissolution rate of ZrO_2, is four times slower. The surface reaction appears to be controlling the rate of dissolution, with the activation energy for ZrO_2 being 128.8 kJ/mol and for MgAl_2O_4 being 77.8 kJ/mol. This implies that the removal of ZrO_2 particles by dissolution in this type of slag is not feasible for the typical residence times expected, and strategies that prevent the incorporation of these particles should be used.
机译：由ZrO_2，Al_2O_3，MgO和MgAl_2O_4组成的非金属夹杂物在钢的连续铸造过程中会产生问题，因此，如果这些颗粒出现在炉渣中，则希望将其完全溶解。使用共聚焦扫描激光显微镜（CSLM）原位研究了这些氧化物颗粒在含1.5wt％B_2O_3的无氟炉渣中的溶解行为。研究了颗粒类型，初始尺寸和炉渣温度的影响。进行了具有能量色散X射线能谱的扫描电子显微镜（SEM-EDS）来化学分析淬灭的样品，以便识别形成的任何表面反应或扩散层。将分析预测模型与实验数据进行比较，以将动力学与可能的限速步骤关联起来。使用基于商业CALPHAD的软件确定模型中使用的热力学溶解度极限。发现Al_2O_3，MgO和MgAl_2O_4的溶解速度彼此相当，而ZrO_2的溶解速度慢四倍。表面反应似乎正在控制溶解速率，ZrO_2的活化能为128.8 kJ / mol，MgAl_2O_4的活化能为77.8 kJ / mol。这意味着通过溶解在这种类型的炉渣中去除ZrO_2颗粒对于预期的典型停留时间是不可行的，应采用防止这些颗粒掺入的策略。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号