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Cold Sintering Breaks Temperature Barriers: Aqueous‐NaOH‐Driven Densification of Amorphous SiHfBN Ceramics at 250°C.

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Title: Cold Sintering Breaks Temperature Barriers: Aqueous‐NaOH‐Driven Densification of Amorphous SiHfBN Ceramics at 250°C.
Authors: Li, Wei1,2,3 (AUTHOR), Jiang, Tianshu2 (AUTHOR), Ding, Jinxue2 (AUTHOR), Widenmeyer, Marc2 (AUTHOR), Feldmann, Laura2 (AUTHOR), Zhang, Yaohao2 (AUTHOR), Zhuo, Fangping2 (AUTHOR), Xie, Wenjie2 (AUTHOR), Weidenkaff, Anke2 (AUTHOR), Molina‐Luna, Leopoldo2 (AUTHOR), Riedel, Ralf2 (AUTHOR), Yu, Zhaoju1,4 (AUTHOR) zhaojuyu@xmu.edu.cn
Source: Journal of the American Ceramic Society. Jun2026, Vol. 109 Issue 6, p1-8. 8p.
Subjects: Sintering, Sodium hydroxide, Amorphous substances, Ceramic engineering, Thermal stability, Ceramics, Mechanical behavior of materials
Abstract: Conventional ceramic processing often requires temperatures above 1500°C, locking the field into high energy costs and limited compositional flexibility. Here, we defy this paradigm by demonstrating the cold sintering of amorphous SiHfBN ceramics at only 250°C. Using a transient aqueous NaOH medium, amorphous SiHfBN powders derived from a single‐source polymeric precursor are transformed into dense monoliths (≈ 88% relative density) through a synergistic combination of lubrication‐assisted particle rearrangement and surface‐driven hydrolysis‐condensation reactions. The resulting ceramics achieve a Vickers hardness of 2.8 GPa and compressive strength of 114 MPa, rivaling porous Si3N4 processed above 1700°C. They also exhibit good thermal stability and oxidation behavior, achieving a mass loss of only 0.25% at 1000°C in air. Their ultralow thermal conductivity (0.7–1.3 W m−1·K−1), structural integrity, and stability up to 700°C establish a new processing frontier for amorphous Si‐based ceramic materials. This work redefines the boundaries of ceramic fabrication, positioning cold sintering as a viable route for future energy‐efficient manufacturing of high‐performance nonoxide ceramics. [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: 194810610
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Cold Sintering Breaks Temperature Barriers: Aqueous‐NaOH‐Driven Densification of Amorphous SiHfBN Ceramics at 250°C.
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  Data: <searchLink fieldCode="AR" term="%22Li%2C+Wei%22">Li, Wei</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jiang%2C+Tianshu%22">Jiang, Tianshu</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ding%2C+Jinxue%22">Ding, Jinxue</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Widenmeyer%2C+Marc%22">Widenmeyer, Marc</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Feldmann%2C+Laura%22">Feldmann, Laura</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Yaohao%22">Zhang, Yaohao</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhuo%2C+Fangping%22">Zhuo, Fangping</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xie%2C+Wenjie%22">Xie, Wenjie</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Weidenkaff%2C+Anke%22">Weidenkaff, Anke</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Molina‐Luna%2C+Leopoldo%22">Molina‐Luna, Leopoldo</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Riedel%2C+Ralf%22">Riedel, Ralf</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Zhaoju%22">Yu, Zhaoju</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<i> zhaojuyu@xmu.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>. Jun2026, Vol. 109 Issue 6, p1-8. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Sintering%22">Sintering</searchLink><br /><searchLink fieldCode="DE" term="%22Sodium+hydroxide%22">Sodium hydroxide</searchLink><br /><searchLink fieldCode="DE" term="%22Amorphous+substances%22">Amorphous substances</searchLink><br /><searchLink fieldCode="DE" term="%22Ceramic+engineering%22">Ceramic engineering</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stability%22">Thermal stability</searchLink><br /><searchLink fieldCode="DE" term="%22Ceramics%22">Ceramics</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Conventional ceramic processing often requires temperatures above 1500°C, locking the field into high energy costs and limited compositional flexibility. Here, we defy this paradigm by demonstrating the cold sintering of amorphous SiHfBN ceramics at only 250°C. Using a transient aqueous NaOH medium, amorphous SiHfBN powders derived from a single‐source polymeric precursor are transformed into dense monoliths (≈ 88% relative density) through a synergistic combination of lubrication‐assisted particle rearrangement and surface‐driven hydrolysis‐condensation reactions. The resulting ceramics achieve a Vickers hardness of 2.8 GPa and compressive strength of 114 MPa, rivaling porous Si3N4 processed above 1700°C. They also exhibit good thermal stability and oxidation behavior, achieving a mass loss of only 0.25% at 1000°C in air. Their ultralow thermal conductivity (0.7–1.3 W m−1·K−1), structural integrity, and stability up to 700°C establish a new processing frontier for amorphous Si‐based ceramic materials. This work redefines the boundaries of ceramic fabrication, positioning cold sintering as a viable route for future energy‐efficient manufacturing of high‐performance nonoxide ceramics. [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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        Value: 10.1111/jace.70944
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      – Code: eng
        Text: English
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        PageCount: 8
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    Subjects:
      – SubjectFull: Sintering
        Type: general
      – SubjectFull: Sodium hydroxide
        Type: general
      – SubjectFull: Amorphous substances
        Type: general
      – SubjectFull: Ceramic engineering
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      – SubjectFull: Thermal stability
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      – SubjectFull: Ceramics
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      – SubjectFull: Mechanical behavior of materials
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      – TitleFull: Cold Sintering Breaks Temperature Barriers: Aqueous‐NaOH‐Driven Densification of Amorphous SiHfBN Ceramics at 250°C.
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              Text: Jun2026
              Type: published
              Y: 2026
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