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Knoll, Marco ; Willert-Porada, Monika:
Synthesis of Porous Silicon Nitride Ceramic with a Compositional Gradient.
In: Kawasaki, Akira ; Kumakawa, Akinaga ; Niino, Masayuki
(Hrsg.):
Multiscale, multifunctional and functionally graded materials. -
Stafa-Zurich
: Trans Tech Publ.
,
2010
. - S. 477-482
. - (Materials Science Forum
; 631/632
)
ISBN 978-0-87849-307-4
DOI: https://doi.org/10.4028/www.scientific.net/MSF.631-632.477
Abstract
This paper summarises results of a study on graded surface layer composition in porous silicon nitride ceramics with a nominal Yb-silicate, Yb2SiO5-additive content of 3.2 mol%, corresponding to 10wt%. A compositional gradient of the additive is formed within the sintered part, depending upon the sintering conditions. The thickness and the phase content of the compositional gradient is significantly affected by the nitrogen activity of the sintering atmosphere. When argon gas is used during heating up and replaced by nitrogen upon soaking, the surface of the sintered ceramic is free of Yb2SiO5, whereas in N2-atmosphere a silicate-rich coating is found as surface layer of the porous silicon nitride ceramic. In presence of carbon and nitrogen, the surface is covered by SiC. In particular the Yb-silicate enriched surface layer can be used as base for an Environmental Barrier Coating, EBC, to protect the interior of the ceramic from hot gas corrosion.
Weitere Angaben
| Publikationsform: | Aufsatz in einem Buch |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Ehemalige Professoren > Lehrstuhl Werkstoffverarbeitung - Univ.-Prof. Dr. Monika Willert-Porada Fakultäten Fakultäten > Fakultät für Ingenieurwissenschaften > Ehemalige Professoren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 09 Okt 2017 13:17 |
| Letzte Änderung: | 09 Okt 2017 13:17 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/14527 |