Kaur, Sarabjeet ; Riedel, Ralf ; Ionescu, Emanuel (2014)
Pressureless fabrication of dense monolithic SiC ceramics from a polycarbosilane.
In: Journal of the European Ceramic Society, 34 (15)
doi: 10.1016/j.jeurceramsoc.2014.05.002
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
This paper presents the pressureless preparation of dense and crack-free near stoichiometric SiC monoliths via cross-linking and pyrolysis of a polycarbosilane, followed by polymer-infiltration-pyrolysis cycles. The composition and the porosity of the samples strongly depend on the processing temperature. Thus, at 1050–1100 °C, the SiC monoliths are X-ray amorphous and exhibit low amounts of oxygen and excess carbon; their porosity was rather high (>10%). Higher processing temperatures induced the crystallization of β-SiC. The removal of oxygen and excess carbon due to CO release allowed for obtaining near-stoichiometric compositions at 1700 °C. However, the residual porosity of the samples increased. The use of the PIP technique led already after six cycles to dense monoliths (residual porosity ca. 0.5%). The present study emphasizes the potential of the polymer processing technique for the fabrication of near stoichiometric and dense SiC monoliths, which might be used for structural applications in harsh conditions.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Kaur, Sarabjeet ; Riedel, Ralf ; Ionescu, Emanuel |
| Art des Eintrags: | Bibliographie |
| Titel: | Pressureless fabrication of dense monolithic SiC ceramics from a polycarbosilane |
| Sprache: | Englisch |
| Publikationsjahr: | 14 Dezember 2014 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 34 |
| (Heft-)Nummer: | 15 |
| DOI: | 10.1016/j.jeurceramsoc.2014.05.002 |
| Kurzbeschreibung (Abstract): | This paper presents the pressureless preparation of dense and crack-free near stoichiometric SiC monoliths via cross-linking and pyrolysis of a polycarbosilane, followed by polymer-infiltration-pyrolysis cycles. The composition and the porosity of the samples strongly depend on the processing temperature. Thus, at 1050–1100 °C, the SiC monoliths are X-ray amorphous and exhibit low amounts of oxygen and excess carbon; their porosity was rather high (>10%). Higher processing temperatures induced the crystallization of β-SiC. The removal of oxygen and excess carbon due to CO release allowed for obtaining near-stoichiometric compositions at 1700 °C. However, the residual porosity of the samples increased. The use of the PIP technique led already after six cycles to dense monoliths (residual porosity ca. 0.5%). The present study emphasizes the potential of the polymer processing technique for the fabrication of near stoichiometric and dense SiC monoliths, which might be used for structural applications in harsh conditions. |
| Freie Schlagworte: | Polycarbosilane, SiC monoliths, Polymer derived ceramics (PDCs), Pressureless processing, Polymer infiltration pyrolysis (PIP) |
| 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: | 07 Jul 2014 12:12 |
| Letzte Änderung: | 17 Dez 2018 12:09 |
| PPN: | |
| Sponsoren: | This work was financially supported by Xycarb Ceramic B. V. (Schunk GmbH). |
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