Processing and characterization of multiphase ceramic composites part II: Triplex composites with a wide sintering temperature Range

Dong Kyu Kim, Waltraud M. Kriven

Research output: Contribution to journalArticlepeer-review

Abstract

Three-phase (triplex) ceramic composites with improved thermal stabilities resulting from minimized grain growth due to extended grain separations are introduced. Al2O3, yttrium aluminum garnet (YAG, Y 3Al5O12), and ZrO2 were chemically compatible to make a stable triplex composite. Another stable composite could be made due to chemical compatibility among Al2O3, NiAl 2O4, and 3 mol% yttria-tetragonal zirconia polycrystals (3Y-TZP). The composites of 33 vol% Al2O3-33 vol% YAG-33 vol% ZrO2, 33 vol% Al2O3-33 vol% NiAl 2O4-33 vol% 3Y-TZP, and 50 vol% Al2O 3-25 vol% NiAl2O4-25 vol% 3Y-TZP were fabricated using either sintering or hot pressing procedures. The sintered 33 vol% Al2O3-33 vol% YAG-33 vol% ZrO2 and 33 vol% Al2O3-33 vol% NiAl2O4-33 vol% 3Y-TZP composites demonstrated a "self accommodating sintering effect" having a wide sintering range without any extensive change in properties. Annealing of the 33 vol% Al2O3-33 vol% NiAl 2O4-33 vol% 3Y-TZP composite at 1600°C for 50 h resulted in higher strength retention after heat treatment compared with that expected from the sum of the strengths of constituent phases. This was attributed to a mutual, grain growth retardation effect. Chemical compatibilities, mechanical properties, microstructures, and thermal stabilities of the composites were studied.

Original languageEnglish (US)
Pages (from-to)793-798
Number of pages6
JournalJournal of the American Ceramic Society
Volume91
Issue number3
DOIs
StatePublished - Mar 2008

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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