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In Situ Observation of Dissolution Behavior of Aluminum Oxide and Nitride in CaO–Al2O3 Slag.

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Title: In Situ Observation of Dissolution Behavior of Aluminum Oxide and Nitride in CaO–Al2O3 Slag.
Authors: Zang, Xu1,2 (AUTHOR), Liu, Chengjun1,2 (AUTHOR) liucj@smm.neu.edu.cn, Wang, Yeguang1,2 (AUTHOR)
Source: Steel Research International. Mar2026, Vol. 97 Issue 3, p1454-1466. 13p.
Subjects: Aluminum oxide, Aluminum nitride, Diffusion coefficients, Gas phase reactions, Mass transfer, Confocal microscopy, Slag, Solubilization
Abstract: In this study, the dissolution behavior of Al2O3 and AlN inclusions in CaO–Al2O3 slag is investigated. Preliminary experiments are conducted to ensure slag homogeneity and AlN stability. Subsequently, the dissolution process of inclusions is investigated through confocal laser scanning microscopy. The dissolution process of Al2O3 inclusion is direct, and no detectable intermediate phase forms during the process. In contrast, the AlN inclusion shows a very intense gas reaction with slag during the dissolution process. Based on the inclusion dissolution mechanism, the Al2O3 directly dissolves as (Al2O3) molecules into the slag. However, AlN might undergo an indirect dissolution process within the slag. The initial reaction between AlN and (O2) from the slag phase results in the formation of N2 bubbles and Al2O3. Subsequently, the Al2O3 dissolves as (Al2O3) into the slag, and partial N2 bubbles diffuse into the slag. The rate limiting step of AlN and Al2O3 dissolution is both distance‐limited mass transfer in the slag, while the mass transfer distance of AlN is longer than that of Al2O3. The calculated mass diffusion coefficient of AlN (DAlN = 6.56 × 10−9 m2 s−1) is significantly smaller than that of Al2O3 (DAl2O3 = 4.56 × 10−8 m2 s−1). [ABSTRACT FROM AUTHOR]
Copyright of Steel Research International is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 192089621
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: In Situ Observation of Dissolution Behavior of Aluminum Oxide and Nitride in CaO–Al<subscript>2</subscript>O<subscript>3</subscript> Slag.
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  Data: <searchLink fieldCode="AR" term="%22Zang%2C+Xu%22">Zang, Xu</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Chengjun%22">Liu, Chengjun</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> liucj@smm.neu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Yeguang%22">Wang, Yeguang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Steel+Research+International%22">Steel Research International</searchLink>. Mar2026, Vol. 97 Issue 3, p1454-1466. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Aluminum+oxide%22">Aluminum oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum+nitride%22">Aluminum nitride</searchLink><br /><searchLink fieldCode="DE" term="%22Diffusion+coefficients%22">Diffusion coefficients</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+phase+reactions%22">Gas phase reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Mass+transfer%22">Mass transfer</searchLink><br /><searchLink fieldCode="DE" term="%22Confocal+microscopy%22">Confocal microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Slag%22">Slag</searchLink><br /><searchLink fieldCode="DE" term="%22Solubilization%22">Solubilization</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In this study, the dissolution behavior of Al2O3 and AlN inclusions in CaO–Al2O3 slag is investigated. Preliminary experiments are conducted to ensure slag homogeneity and AlN stability. Subsequently, the dissolution process of inclusions is investigated through confocal laser scanning microscopy. The dissolution process of Al2O3 inclusion is direct, and no detectable intermediate phase forms during the process. In contrast, the AlN inclusion shows a very intense gas reaction with slag during the dissolution process. Based on the inclusion dissolution mechanism, the Al2O3 directly dissolves as (Al2O3) molecules into the slag. However, AlN might undergo an indirect dissolution process within the slag. The initial reaction between AlN and (O2) from the slag phase results in the formation of N2 bubbles and Al2O3. Subsequently, the Al2O3 dissolves as (Al2O3) into the slag, and partial N2 bubbles diffuse into the slag. The rate limiting step of AlN and Al2O3 dissolution is both distance‐limited mass transfer in the slag, while the mass transfer distance of AlN is longer than that of Al2O3. The calculated mass diffusion coefficient of AlN (DAlN = 6.56 × 10−9 m2 s−1) is significantly smaller than that of Al2O3 (DAl2O3 = 4.56 × 10−8 m2 s−1). [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Steel Research International is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1002/srin.202500686
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 1454
    Subjects:
      – SubjectFull: Aluminum oxide
        Type: general
      – SubjectFull: Aluminum nitride
        Type: general
      – SubjectFull: Diffusion coefficients
        Type: general
      – SubjectFull: Gas phase reactions
        Type: general
      – SubjectFull: Mass transfer
        Type: general
      – SubjectFull: Confocal microscopy
        Type: general
      – SubjectFull: Slag
        Type: general
      – SubjectFull: Solubilization
        Type: general
    Titles:
      – TitleFull: In Situ Observation of Dissolution Behavior of Aluminum Oxide and Nitride in CaO–Al2O3 Slag.
        Type: main
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          Name:
            NameFull: Zang, Xu
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          Name:
            NameFull: Liu, Chengjun
      – PersonEntity:
          Name:
            NameFull: Wang, Yeguang
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          Dates:
            – D: 01
              M: 03
              Text: Mar2026
              Type: published
              Y: 2026
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              Value: 97
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              Value: 3
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            – TitleFull: Steel Research International
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