Wen, Qingbo ; Yu, Zhaoju ; Riedel, Ralf ; Ionescu, Emanuel (2020)
Significant improvement of high-temperature oxidation resistance of HfC/SiC ceramic nanocomposites with the incorporation of a small amount of boron.
In: Journal of the European Ceramic Society, 40 (10)
doi: 10.1016/j.jeurceramsoc.2020.03.067
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Oxidation behavior of boron-containing HfC/SiC nanocomposites (SHBC) at temperatures up to 1500 degrees C and with exposure time up to 100 h was investigated. Two strategies to improve the oxidation resistance of the HfC/SiC ceramics are proposed. First concept involves the incorporation of a small amount of boron (ca. 0.6 wt.%) into the nanocomposite via a single-source-precursor approach, which contributes significantly to the enhancement of its oxidation resistance. Parabolic oxidation rate constants of 10(-3) to 10(-4) mg2/(cm(4) h) at 1300 - 1500 degrees C were measured for SHBC and were several orders of magnitude lower than those recorded for boron-free HfC/SiC. The second improvement concept is realized via passivation of the samples upon short-term oxidation at 1400 degrees C, providing an excellent oxidation resistance over a wide temperature range. This is a crucial step especially when considering the poor oxidation behavior of HfC and the sluggish formation of protective silica scale at moderate temperatures.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2020 |
| Autor(en): | Wen, Qingbo ; Yu, Zhaoju ; Riedel, Ralf ; Ionescu, Emanuel |
| Art des Eintrags: | Bibliographie |
| Titel: | Significant improvement of high-temperature oxidation resistance of HfC/SiC ceramic nanocomposites with the incorporation of a small amount of boron |
| Sprache: | Englisch |
| Publikationsjahr: | August 2020 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 40 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.1016/j.jeurceramsoc.2020.03.067 |
| URL / URN: | https://www.sciencedirect.com/science/article/abs/pii/S09552... |
| Kurzbeschreibung (Abstract): | Oxidation behavior of boron-containing HfC/SiC nanocomposites (SHBC) at temperatures up to 1500 degrees C and with exposure time up to 100 h was investigated. Two strategies to improve the oxidation resistance of the HfC/SiC ceramics are proposed. First concept involves the incorporation of a small amount of boron (ca. 0.6 wt.%) into the nanocomposite via a single-source-precursor approach, which contributes significantly to the enhancement of its oxidation resistance. Parabolic oxidation rate constants of 10(-3) to 10(-4) mg2/(cm(4) h) at 1300 - 1500 degrees C were measured for SHBC and were several orders of magnitude lower than those recorded for boron-free HfC/SiC. The second improvement concept is realized via passivation of the samples upon short-term oxidation at 1400 degrees C, providing an excellent oxidation resistance over a wide temperature range. This is a crucial step especially when considering the poor oxidation behavior of HfC and the sluggish formation of protective silica scale at moderate temperatures. |
| Freie Schlagworte: | Polymer-derived ceramic nanocomposites; High-temperature oxidation; Silicon carbide; Hafnium carbide; UHTCs DIBORIDE-SILICON-CARBIDE; ZIRCONIUM DIBORIDE; HAFNIUM CARBIDE; ZRB2-SIC COMPOSITES; C/C COMPOSITES; BEHAVIOR; CARBON; KINETICS; PRECURSOR; ADDITIONS |
| 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: | 14 Mai 2020 06:11 |
| Letzte Änderung: | 14 Mai 2020 06:11 |
| PPN: | |
| Projekte: | Technische Universitat Darmstadt, National Natural Science Foundation of China, Grant Number 51872246, Alexander von Humboldt Foundation, German Research Foundation (DFG), Grant Number IO 64/14-1 |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum