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In Situ Formation of Y 2 Si 2 O 7 –Corundum–Mullite Ceramic Composites with Enhanced Thermal Shock Resistance.

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Title: In Situ Formation of Y 2 Si 2 O 7 –Corundum–Mullite Ceramic Composites with Enhanced Thermal Shock Resistance.
Authors: Wang, Wentao1 (AUTHOR), Tan, Jiafei2 (AUTHOR), Zhang, Xueying1 (AUTHOR), Zhang, Qi1,2 (AUTHOR), Liu, Jiachen1 (AUTHOR) jcliutju@tju.edu.cn
Source: Materials (1996-1944). Apr2026, Vol. 19 Issue 8, p1628. 16p.
Subjects: Corundum, Mullite, Ceramic-matrix composites, Thermal barrier coatings, Sintering, Crystal grain boundaries, Thermal shock
Abstract: Highlights: A Y2O3-SiC synergistic strategy enables in situ formation of Y2Si2O7 in corundum–mullite ceramics. Y2Si2O7 promotes densification and strengthens grain boundaries during sintering. The optimized sample exhibits improved strength and thermal shock resistance. Y2Si2O7 improves crack healing and thermal shock resistance after thermal cycling. The strategy balances strength and thermal shock resistance in multiphase ceramics. Provides guidance for gas turbine combustion chamber insulation materials. The continuous drive for higher efficiency in gas turbines has led to increased combustion temperatures, making the thermal shock resistance of thermal insulation tiles a critical factor limiting performance. Corundum–mullite multiphase ceramics are widely used in such applications; however, their performance is often constrained by an inherent trade-off between mechanical strength and thermal shock resistance. In this work, a synergistic modification strategy based on rare-earth disilicate phases was developed, wherein Y2O3 and SiC were incorporated into a corundum–mullite matrix to enable in situ formation and controlled distribution of Y2Si2O7 via gel casting. During sintering, Y2Si2O7 acts as a transient liquid phase, facilitating densification and grain boundary strengthening; upon thermal shock, it migrates to fill and heal grain boundaries and microcracks, thereby significantly enhancing thermal shock resistance. The optimized sample S5, sintered at 1400 °C, exhibited a bulk density of 2.12 g/cm3 and a bending strength of 68.43 MPa. Notably, after 30 thermal shock cycles (air cooling from 1000 °C to RT), its bending strength increased to 79.71 MPa, corresponding to a 16.48% enhancement. This work provides an effective strategy for incorporating rare-earth disilicates into multiphase ceramics and offers valuable guidance for the development of high-performance components for gas turbines. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI 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.)
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DbLabel: Engineering Source
An: 193436297
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  Label: Title
  Group: Ti
  Data: In Situ Formation of Y 2 Si 2 O 7 –Corundum–Mullite Ceramic Composites with Enhanced Thermal Shock Resistance.
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  Data: <searchLink fieldCode="AR" term="%22Wang%2C+Wentao%22">Wang, Wentao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tan%2C+Jiafei%22">Tan, Jiafei</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Xueying%22">Zhang, Xueying</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Qi%22">Zhang, Qi</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Jiachen%22">Liu, Jiachen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jcliutju@tju.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Apr2026, Vol. 19 Issue 8, p1628. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Corundum%22">Corundum</searchLink><br /><searchLink fieldCode="DE" term="%22Mullite%22">Mullite</searchLink><br /><searchLink fieldCode="DE" term="%22Ceramic-matrix+composites%22">Ceramic-matrix composites</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+barrier+coatings%22">Thermal barrier coatings</searchLink><br /><searchLink fieldCode="DE" term="%22Sintering%22">Sintering</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+grain+boundaries%22">Crystal grain boundaries</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+shock%22">Thermal shock</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Highlights: A Y2O3-SiC synergistic strategy enables in situ formation of Y2Si2O7 in corundum–mullite ceramics. Y2Si2O7 promotes densification and strengthens grain boundaries during sintering. The optimized sample exhibits improved strength and thermal shock resistance. Y2Si2O7 improves crack healing and thermal shock resistance after thermal cycling. The strategy balances strength and thermal shock resistance in multiphase ceramics. Provides guidance for gas turbine combustion chamber insulation materials. The continuous drive for higher efficiency in gas turbines has led to increased combustion temperatures, making the thermal shock resistance of thermal insulation tiles a critical factor limiting performance. Corundum–mullite multiphase ceramics are widely used in such applications; however, their performance is often constrained by an inherent trade-off between mechanical strength and thermal shock resistance. In this work, a synergistic modification strategy based on rare-earth disilicate phases was developed, wherein Y2O3 and SiC were incorporated into a corundum–mullite matrix to enable in situ formation and controlled distribution of Y2Si2O7 via gel casting. During sintering, Y2Si2O7 acts as a transient liquid phase, facilitating densification and grain boundary strengthening; upon thermal shock, it migrates to fill and heal grain boundaries and microcracks, thereby significantly enhancing thermal shock resistance. The optimized sample S5, sintered at 1400 °C, exhibited a bulk density of 2.12 g/cm3 and a bending strength of 68.43 MPa. Notably, after 30 thermal shock cycles (air cooling from 1000 °C to RT), its bending strength increased to 79.71 MPa, corresponding to a 16.48% enhancement. This work provides an effective strategy for incorporating rare-earth disilicates into multiphase ceramics and offers valuable guidance for the development of high-performance components for gas turbines. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials (1996-1944) is the property of MDPI 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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      – Type: doi
        Value: 10.3390/ma19081628
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      – Code: eng
        Text: English
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        PageCount: 16
        StartPage: 1628
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      – SubjectFull: Corundum
        Type: general
      – SubjectFull: Mullite
        Type: general
      – SubjectFull: Ceramic-matrix composites
        Type: general
      – SubjectFull: Thermal barrier coatings
        Type: general
      – SubjectFull: Sintering
        Type: general
      – SubjectFull: Crystal grain boundaries
        Type: general
      – SubjectFull: Thermal shock
        Type: general
    Titles:
      – TitleFull: In Situ Formation of Y 2 Si 2 O 7 –Corundum–Mullite Ceramic Composites with Enhanced Thermal Shock Resistance.
        Type: main
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            NameFull: Wang, Wentao
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            NameFull: Tan, Jiafei
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            NameFull: Zhang, Xueying
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            NameFull: Zhang, Qi
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            – D: 15
              M: 04
              Text: Apr2026
              Type: published
              Y: 2026
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              Value: 19
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            – TitleFull: Materials (1996-1944)
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