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Polymer-derived SiHfN ceramics: From amorphous bulk ceramics with excellent mechanical properties to high temperature resistant ceramic nanocomposites

Li, Wei ; Li, Fen ; Yu, Zhaoju ; Wen, Qingbo ; Fan, Bingbing ; Feng, Yao ; Zhao, Changhao ; Ricohermoso, Emmanuel III ; Widenmeyer, Marc ; Weidenkaff, Anke ; Riedel, Ralf (2022)
Polymer-derived SiHfN ceramics: From amorphous bulk ceramics with excellent mechanical properties to high temperature resistant ceramic nanocomposites.
In: Journal of the European Ceramic Society, 42 (11)
doi: 10.1016/j.jeurceramsoc.2022.04.028
Article, Bibliographie

Abstract

Within the present work, additive-free amorphous bulk SiHfN ceramics with excellent mechanical properties were prepared by a resource-efficient low-temperature molding method, namely warm-pressing. As densification mechanism viscous flow has been identified based on cross-linking reaction. The critical problems concerning gas evolution and crystallization inducing bloating and cracking are addressed through controlled thermolysis and pressure. The microstructural evolution of the SiHfN ceramics indicates that the incorporation of Hf in perhydropolysilazane not only increases the ceramic yield (97.4 wt%) and crystallization resistance (1300 °C), but also suppresses the transformation from α-Si3N4 to β-Si3N4 at high temperatures (1700 °C). Especially, HfN/α-Si3N4 nanocomposites converted by the SiHfN ceramics at 1500 °C show a slight weight loss of 3.13 wt%, indicating the high temperature resistance of the ceramic nanocomposites. The method proposed in this work opens a new strategy to fabricate additive-free polycrystalline Si3N4- and amorphous Si3N4-based (nano)composites.

Item Type: Article
Erschienen: 2022
Creators: Li, Wei ; Li, Fen ; Yu, Zhaoju ; Wen, Qingbo ; Fan, Bingbing ; Feng, Yao ; Zhao, Changhao ; Ricohermoso, Emmanuel III ; Widenmeyer, Marc ; Weidenkaff, Anke ; Riedel, Ralf
Type of entry: Bibliographie
Title: Polymer-derived SiHfN ceramics: From amorphous bulk ceramics with excellent mechanical properties to high temperature resistant ceramic nanocomposites
Language: English
Date: 2022
Publisher: Elsevier
Journal or Publication Title: Journal of the European Ceramic Society
Volume of the journal: 42
Issue Number: 11
DOI: 10.1016/j.jeurceramsoc.2022.04.028
Abstract:

Within the present work, additive-free amorphous bulk SiHfN ceramics with excellent mechanical properties were prepared by a resource-efficient low-temperature molding method, namely warm-pressing. As densification mechanism viscous flow has been identified based on cross-linking reaction. The critical problems concerning gas evolution and crystallization inducing bloating and cracking are addressed through controlled thermolysis and pressure. The microstructural evolution of the SiHfN ceramics indicates that the incorporation of Hf in perhydropolysilazane not only increases the ceramic yield (97.4 wt%) and crystallization resistance (1300 °C), but also suppresses the transformation from α-Si3N4 to β-Si3N4 at high temperatures (1700 °C). Especially, HfN/α-Si3N4 nanocomposites converted by the SiHfN ceramics at 1500 °C show a slight weight loss of 3.13 wt%, indicating the high temperature resistance of the ceramic nanocomposites. The method proposed in this work opens a new strategy to fabricate additive-free polycrystalline Si3N4- and amorphous Si3N4-based (nano)composites.

Uncontrolled Keywords: Amorphous SiHfN ceramic, Warm-pressing, Ceramic nanocomposites, Mechanical properties
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science > Materials and Resources
Date Deposited: 31 May 2022 05:28
Last Modified: 31 May 2022 05:28
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