The effect of fabrication parameters on the mechanical properties of sintered reaction bonded porous Si3N4 ceramics
- Porous silicon nitride ceramics were prepared via sintered reaction bonded silicon nitride at 1680 °C. The grain size of nitrided Si3N4 and diameter of post-sintered ß-Si3N4 are controlled by size of raw Si. Porosity of 42.14–46.54% and flexural strength from 141 MPa to 165 MPa were obtained. During post-sintering with nano Y2O3 as sintering additive, nano Y2O3 can promote the formation of small ß-Si3N4 nuclei, but the large amount of ß-Si3N4 (>20%) after nitridation also works as nuclei site for precipitation, in consequence the growth of fine ß-Si3N4 grains is restrained, the length is shortened, and the improvement on flexural strength is minimized. The effect of nano SiC on the refinement of the ß-Si3N4 grains is notable because of the pinning effect, while the effect of nano C on the refinement of the ß-Si3N4 grains is not remarkable due to the carbothermal reaction and increase in viscosity of the liquid phase.
Autor*innen: | Dongxu Yao, Y. Xia, K.-h. Zuo, D. Jiang, Jens GünsterORCiD, Y.-P. Zeng, J.G. Heinrich |
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Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Journal of the European Ceramic Society |
Jahr der Erstveröffentlichung: | 2014 |
Herausgeber (Institution): | European Ceramic Society |
Verlag: | Elsevier |
Verlagsort: | Oxford |
Jahrgang/Band: | 34 |
Ausgabe/Heft: | 15 |
Erste Seite: | 3461 |
Letzte Seite: | 3467 |
Freie Schlagwörter: | Anisotropic grain growth; Ceramic; Porous ceramics; Reaction bonding; Silicon nitride |
DOI: | 10.1016/j.jeurceramsoc.2014.06.018 |
ISSN: | 0955-2219 |
ISSN: | 1873-619X |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 20.02.2016 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 12.02.2015 |