文献类型：期刊文献

英文题名：Crystallization of Slag Films of CaO-Al2O3-BaO-CaF2-Li2O-Based Mold Fluxes for High-Aluminum Steels’ Continuous Casting

作者：Long, Xiao Long, Shaolei Luo, Wenbo Li, Xiang Tu, Changping Na, Yunhao Xu, Jinxin

机构：[1] School of Materials and Energy Engineering, Guizhou Institute of Technology, Guiyang, 550003, China

第一机构：贵州理工学院

通信机构：School of Materials and Energy Engineering, Guizhou Institute of Technology, Guiyang, 550003, China;School of Materials and Energy Engineering, Guizhou Institute of Technology, Guiyang, 550003, China|贵州理工学院;

年份：2023

卷号：16

期号：5

外文期刊名：Materials

收录：EI(收录号：20231113728034);Scopus(收录号：2-s2.0-85149858756)

语种：英文

外文关键词：Activation energy - Alumina - Barium compounds - Calcium fluoride - Continuous casting - Differential scanning calorimetry - Fluorspar - Lithium compounds - Magnesium compounds - Molds - Probes - Scanning electron microscopy - Slags

摘要：In this study, solidified films of CaO-Al2O3-BaO-CaF2-Li2O-based mold fluxes with different contents of Al2O3 addition were acquired by immersing an improved water-cooled copper probe in bulk molten slags. This probe can obtain films with representative structures. Different slag temperatures and probe immersion times were employed to investigate the crystallization process. The crystals in the solidified films were identified using X-ray diffraction, the morphologies of the crystals were observed using optical microscopy and scanning electron microscopy, and the kinetic conditions, especially the activation energy of devitrified crystallization in glassy slags, were calculated and discussed based on the differential scanning calorimetry. The results indicated that after adding extra Al2O3, the growing speed and thickness of the solidified films increased, and more time was required for the film thickness to reach a steady state. In addition, fine spinel (MgAl2O4) precipitated in the films at the early stage of solidification after adding 10 wt% of extra Al2O3. Together with LiAlO2, spinel (MgAl2O4) acted as nuclei for the precipitation of BaAl2O4. The apparent activation energy of initial devitrified crystallization decreased from 314.16 KJ/mol (original slag) to 297.32 KJ/mol (5 wt% Al2O3 added) and 269.46 KJ/mol (10 wt% Al2O3 added). The crystallization ratio of the films also increased after adding extra Al2O3. ? 2023 by the authors.