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Long term oxidation behaviour of liquid phase pressureless sintered SiC-AlN ceramics obtained without powder bed

TitoloLong term oxidation behaviour of liquid phase pressureless sintered SiC-AlN ceramics obtained without powder bed
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2006
AutoriMagnani, G., and Beaulardi L.
RivistaJournal of the European Ceramic Society
Volume26
Paginazione3407-3413
ISSN09552219
Parole chiaveAluminum nitride, Ceramic materials, Grain boundaries, Oxidation resistance, Porosity, Powder bed, Pressureless sintering, Silicon carbide, Sintering, Solid solutions
Abstract

This paper describes the results of the investigation of the oxidation behaviour of 50 wt.% SiC-50 wt.%AlN composites obtained by means of pressureless sintering with Y2O3 as sintering-aid and without using a powder bed to limit the weight loss. Sintered bodies show high density (>98%T.D.) and the microstructure reveals a matrix composed by SiC-AlN solid solution with Y10Al2Si3O18N4 as grain boundary phase. This material exhibits a parabolic oxidation kinetic in the temperature range 1200-1500 °C. Long term oxidation (200 h) induces the formation of a protective oxide scale, composed by mullite, cristobalite and yttrium disilicide, up to 1400 °C. At higher temperature (1500 °C), SiC oxidation behaviour changes from "passive" to "active" and the oxide layer consequently shows porosity due to the formation of gaseous species like SiO and CO. © 2005 Elsevier Ltd. All rights reserved.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-33747047004&doi=10.1016%2fj.jeurceramsoc.2005.10.005&partnerID=40&md5=e533a6d3ea31b526ed31c36df0772dc9
DOI10.1016/j.jeurceramsoc.2005.10.005
Citation KeyMagnani20063407