Wen, Qingbo ; Yu, Zhaoju ; Riedel, Ralf ; Ionescu, Emanuel (2021)
Single-source-precursor synthesis and high-temperature evolution of a boron-containing SiC/HfC ceramic nano/micro composite.
In: Journal of the European Ceramic Society, 41 (5)
doi: 10.1016/j.jeurceramsoc.2020.05.031
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
A boron-containing SiHfC(N,O) amorphous ceramic was synthesized upon pyrolysis of a single-source-precursor at 1000 degrees C in Ar atmosphere. The high-temperature microstructural evolution of the ceramic at high temperatures was studied using X-ray powder diffraction, Raman spectroscopy, solid-state nuclear magnetic resonance spectroscopy and transmission electron microscopy. The results show that the ceramic consists of an SiHfC(N,O)-based amorphous matrix and finely dispersed sp(2)-hybridized boron-containing carbon (i.e. ByC). High temperature annealing of ByC/SiHfC(N,O) leads to the precipitation of HfCxN1-x nanoparticles as well as to beta-SiC crystallization. After annealing at temperatures beyond 1900 degrees C, HfB2 formation was observed. The incorporation of boron into SiHfC(N,O) leads to an increase of its sintering activity, consequently providing dense materials possessing improved mechanical properties as compared to those of boron-free SiC/HfC. Thus, hardness and elastic modulus values up to 25.7 +/- 5.3 and 344.7 +/- 43.0 GPa, respectively, were measured for the dense monolithic SiC/HfCxN1-x/HfB2/C ceramic nano/micro composite.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2021 |
| Autor(en): | Wen, Qingbo ; Yu, Zhaoju ; Riedel, Ralf ; Ionescu, Emanuel |
| Art des Eintrags: | Bibliographie |
| Titel: | Single-source-precursor synthesis and high-temperature evolution of a boron-containing SiC/HfC ceramic nano/micro composite |
| Sprache: | Englisch |
| Publikationsjahr: | Mai 2021 |
| Verlag: | Elsevier Science Ltd. |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 41 |
| (Heft-)Nummer: | 5 |
| DOI: | 10.1016/j.jeurceramsoc.2020.05.031 |
| URL / URN: | https://www.sciencedirect.com/science/article/abs/pii/S09552... |
| Kurzbeschreibung (Abstract): | A boron-containing SiHfC(N,O) amorphous ceramic was synthesized upon pyrolysis of a single-source-precursor at 1000 degrees C in Ar atmosphere. The high-temperature microstructural evolution of the ceramic at high temperatures was studied using X-ray powder diffraction, Raman spectroscopy, solid-state nuclear magnetic resonance spectroscopy and transmission electron microscopy. The results show that the ceramic consists of an SiHfC(N,O)-based amorphous matrix and finely dispersed sp(2)-hybridized boron-containing carbon (i.e. ByC). High temperature annealing of ByC/SiHfC(N,O) leads to the precipitation of HfCxN1-x nanoparticles as well as to beta-SiC crystallization. After annealing at temperatures beyond 1900 degrees C, HfB2 formation was observed. The incorporation of boron into SiHfC(N,O) leads to an increase of its sintering activity, consequently providing dense materials possessing improved mechanical properties as compared to those of boron-free SiC/HfC. Thus, hardness and elastic modulus values up to 25.7 +/- 5.3 and 344.7 +/- 43.0 GPa, respectively, were measured for the dense monolithic SiC/HfCxN1-x/HfB2/C ceramic nano/micro composite. |
| Freie Schlagworte: | Polymer-derived ceramic nanocomposites, Silicon carbide, Hafnium carbide, High-temperature, UHTCs |
| Zusätzliche Informationen: | Part of Special Issue: Science of High-Temperature Ceramic-matrix Composites |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 12 Mär 2021 07:08 |
| Letzte Änderung: | 12 Mär 2021 07:08 |
| PPN: | |
| Projekte: | Technische Universitat Darmstadt, National Natural Science Foundation of China (NSFC), Grant Number 51872246, Alexander von Humboldt Foundation, German Research Foundation (DFG), European Commission, Grant Number IO 64/14-1 |
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