Sintering, high temperature strength and oxidation resistance of liquid-phase-pressureless-sintered SiC-AlN ceramics with addition of rare-earth oxides

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Abstract

SiC-AlN composites can be pressureless sintered with the addition of rare-earth oxides (RE = Y, Yb, Er, Lu, Ho, Sm, Ce) and without protective powder bed. Sintered bodies showed high density (≥97% T.D.) and were mainly composed by 2H SiC-AlN solid solution with additive containing grain boundary phases. The high temperature strength and oxidation resistance of the composites were also investigated and correlated with the cationic radii of the oxide additives. The flexural strength at 1500 °C increased from 269 MPa to 587 MPa as direct consequence of the rare-earth cationic radius decrease. The specific weight gain during oxidation at 1500 °C for 200 h showed the same behaviour, decreasing from 12.60 mg/cm2to 3.13 mg/cm2. © 2009 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)2411 - 2417
Number of pages7
JournalJournal of the European Ceramic Society
Volume29
Issue number11
DOIs
Publication statusPublished - Aug 2009
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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