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Synthesis of Porous Silicon Nitride Ceramic with a Compositional Gradient

Title data

Knoll, Marco ; Willert-Porada, Monika:
Synthesis of Porous Silicon Nitride Ceramic with a Compositional Gradient.
In: Kawasaki, Akira ; Kumakawa, Akinaga ; Niino, Masayuki (ed.): Multiscale, multifunctional and functionally graded materials. - Stafa-Zurich : Trans Tech Publ. , 2010 . - pp. 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 in another language

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.

Further data

Item Type: Article in a book
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Ehemalige Professoren > Chair Materials Processing - Univ.-Prof. Dr. Monika Willert-Porada
Faculties > Faculty of Engineering Science > Ehemalige Professoren
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 09 Oct 2017 13:17
Last Modified: 09 Oct 2017 13:17
URI: https://eref.uni-bayreuth.de/id/eprint/14527