Phase Transitions and Atomic-Scale Migration During the Preoxidation of a Titania/Ferrous Oxide Solution

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• 作者：Zhen-Yang Wang ; Jian-Liang Zhang ; Xiang-Dong Xing ; Zheng-Jian Liu ; Ya-Peng Zhang…
• 刊名：JOM Journal of the Minerals, Metals and Materials Society
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：68
• 期：2
• 页码：656-667
• 全文大小：2,972 KB
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• 作者单位：Zhen-Yang Wang (1)
  Jian-Liang Zhang (1)
  Xiang-Dong Xing (2)
  Zheng-Jian Liu (1)
  Ya-Peng Zhang (1)
  Xing-Le Liu (1)
  Yi-Ran Liu (1)
  
  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China
  2. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Metallic Materials
  Nanotechnology
  Crystallography
  
• 出版者：Springer Boston
• ISSN：1543-1851

文摘

The non-isothermal preoxidation of the titania/ferrous oxide solution (TFOS) was investigated between 300°C and 1200°C. To explore the TFOS preoxidation mechanism, the phase transitions, crystal structure behavior, subreactions, and atomic-scale migration and enrichment of the TFOS during preoxidation were studied. Two different titanium and iron solutions were distinguished by scanning electron microscopy analysis. The phase transitions from titanomagnetite (TTM) to titanohematite to pseudobrookite (PSB) were indicated by the separation and enrichment of Ti and Fe, which migrated into PSB and hematite, respectively. This occurred alongside the generation and destruction of FeTiO₃. Multiple local maxima and shoulders were observed in the double-derivative thermogravimetric curves during the preoxidation process, indicating the existence and initial reaction temperatures of five stages of subreactions. Compared with the theoretical mass gain (3.28 wt.%), only 80.8 at.% of the Fe2+ was oxidized to Fe3+, leaving unoxidized TTM in the solid solution during non-isothermal oxidation at 1200°C. The concentration of Ti gradually increased in the lamellar structures. However, Fe, Al, and O were mostly restricted to the homogeneous regions. The segregation of Mg only became obvious when TFOS was oxidized at high temperatures. The enrichment reduced the impact of Ti when O migrated during the reduction process, thus, enhancing the reducibility of the TFOS after preoxidation.