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

Giuseppe Magnani, Leandro Beaulardi

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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 Y2O3as 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 Y10Al2Si3O18N4as 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.
Original languageEnglish
Pages (from-to)3407 - 3413
Number of pages7
JournalJournal of the European Ceramic Society
Volume26
Issue number15
DOIs
Publication statusPublished - 2006
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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