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
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2022 |
| Autor(en): | Li, Wei ; Li, Fen ; Yu, Zhaoju ; Wen, Qingbo ; Fan, Bingbing ; Feng, Yao ; Zhao, Changhao ; Ricohermoso, Emmanuel III ; Widenmeyer, Marc ; Weidenkaff, Anke ; Riedel, Ralf |
| Art des Eintrags: | Bibliographie |
| Titel: | Polymer-derived SiHfN ceramics: From amorphous bulk ceramics with excellent mechanical properties to high temperature resistant ceramic nanocomposites |
| Sprache: | Englisch |
| Publikationsjahr: | 2022 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 42 |
| (Heft-)Nummer: | 11 |
| DOI: | 10.1016/j.jeurceramsoc.2022.04.028 |
| Kurzbeschreibung (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. |
| Freie Schlagworte: | Amorphous SiHfN ceramic, Warm-pressing, Ceramic nanocomposites, Mechanical properties |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Werkstofftechnik und Ressourcenmanagement |
| Hinterlegungsdatum: | 31 Mai 2022 05:28 |
| Letzte Änderung: | 31 Mai 2022 05:28 |
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