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Time evolution of microstructure and mechanical properties of transparent mullite glass ceramics.

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Title: Time evolution of microstructure and mechanical properties of transparent mullite glass ceramics.
Authors: Liu, Chenjie1 (AUTHOR), Xing, Junhao1 (AUTHOR) xjh8023u@163.com, Cheng, Yuntao1 (AUTHOR), Qiao, Ang1 (AUTHOR), Tao, Haizheng1 (AUTHOR) thz@whut.edu.cn
Source: Journal of the American Ceramic Society. Jan2026, Vol. 109 Issue 1, p1-11. 11p.
Subjects: Mullite, Glass-ceramics, Mechanical behavior of materials, Nanocrystals, Microstructure, Crystallization, Heat treatment, Transparency (Optics)
Abstract: Transparent mullite glass ceramics have attracted considerable attention for engineering applications due to their unique combination of excellent mechanical and optical transparency. In this study, a series of mullite glass ceramics was prepared by heating the 30Al2O3·70SiO2 glass at the crystallization peak temperature for varying durations (up to 40 h). The hardness exhibited a sharp increase from 7.30 to 9.30 GPa within the initial 2 h. It then increased only slightly to 9.87 GPa after 30 h, before declining marginally to 9.75 GPa after 40 h. Similar trends were observed for the elastic, shear, and bulk moduli. Correspondingly, the crystallinity increased rapidly to 60% within the first 2 h, followed by a small rise of only 5% to 65% after 40 h of heat treatment. However, prolonged heat treatment led to a continuous drop in crack initiation resistance (CR) from 12.30 N for the as‐prepared sample to only 1.92 N for the sample heat‐treated at the crystallization peak temperature (i.e., 993°C) for 40 h. According to the morphological analysis from field emission‐scanning electron microscopy, this phenomenon is attributed to the formation of microcracks in these mullite glass ceramics due to nanocrystal coarsening or large interfacial stress originating from the thermal expansion mismatch. These findings provide fundamental insights into designing transparent ceramics with tailored mechanical properties through controlled crystallization. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the American Ceramic Society 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: 191210650
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Time evolution of microstructure and mechanical properties of transparent mullite glass ceramics.
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  Data: <searchLink fieldCode="AR" term="%22Liu%2C+Chenjie%22">Liu, Chenjie</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xing%2C+Junhao%22">Xing, Junhao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> xjh8023u@163.com</i><br /><searchLink fieldCode="AR" term="%22Cheng%2C+Yuntao%22">Cheng, Yuntao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Qiao%2C+Ang%22">Qiao, Ang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tao%2C+Haizheng%22">Tao, Haizheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> thz@whut.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Ceramic+Society%22">Journal of the American Ceramic Society</searchLink>. Jan2026, Vol. 109 Issue 1, p1-11. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Mullite%22">Mullite</searchLink><br /><searchLink fieldCode="DE" term="%22Glass-ceramics%22">Glass-ceramics</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Nanocrystals%22">Nanocrystals</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Crystallization%22">Crystallization</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+treatment%22">Heat treatment</searchLink><br /><searchLink fieldCode="DE" term="%22Transparency+%28Optics%29%22">Transparency (Optics)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Transparent mullite glass ceramics have attracted considerable attention for engineering applications due to their unique combination of excellent mechanical and optical transparency. In this study, a series of mullite glass ceramics was prepared by heating the 30Al2O3·70SiO2 glass at the crystallization peak temperature for varying durations (up to 40 h). The hardness exhibited a sharp increase from 7.30 to 9.30 GPa within the initial 2 h. It then increased only slightly to 9.87 GPa after 30 h, before declining marginally to 9.75 GPa after 40 h. Similar trends were observed for the elastic, shear, and bulk moduli. Correspondingly, the crystallinity increased rapidly to 60% within the first 2 h, followed by a small rise of only 5% to 65% after 40 h of heat treatment. However, prolonged heat treatment led to a continuous drop in crack initiation resistance (CR) from 12.30 N for the as‐prepared sample to only 1.92 N for the sample heat‐treated at the crystallization peak temperature (i.e., 993°C) for 40 h. According to the morphological analysis from field emission‐scanning electron microscopy, this phenomenon is attributed to the formation of microcracks in these mullite glass ceramics due to nanocrystal coarsening or large interfacial stress originating from the thermal expansion mismatch. These findings provide fundamental insights into designing transparent ceramics with tailored mechanical properties through controlled crystallization. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the American Ceramic Society 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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      – Type: doi
        Value: 10.1111/jace.70323
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 11
        StartPage: 1
    Subjects:
      – SubjectFull: Mullite
        Type: general
      – SubjectFull: Glass-ceramics
        Type: general
      – SubjectFull: Mechanical behavior of materials
        Type: general
      – SubjectFull: Nanocrystals
        Type: general
      – SubjectFull: Microstructure
        Type: general
      – SubjectFull: Crystallization
        Type: general
      – SubjectFull: Heat treatment
        Type: general
      – SubjectFull: Transparency (Optics)
        Type: general
    Titles:
      – TitleFull: Time evolution of microstructure and mechanical properties of transparent mullite glass ceramics.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Liu, Chenjie
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            NameFull: Xing, Junhao
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            NameFull: Cheng, Yuntao
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            NameFull: Qiao, Ang
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            NameFull: Tao, Haizheng
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            – D: 01
              M: 01
              Text: Jan2026
              Type: published
              Y: 2026
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              Value: 109
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            – TitleFull: Journal of the American Ceramic Society
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