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Preparation of zirconia–mullite composites by an infiltration route

Authors
Journal
Materials Science and Engineering A
0921-5093
Publisher
Elsevier
Publication Date
Volume
405
Identifiers
DOI: 10.1016/j.msea.2005.06.005
Keywords
  • Mullite
  • Zr(Y)O2
  • Liquid Infiltration

Abstract

Abstract In order to improve the mechanical properties of pure mullite ceramics, a process has been developed that incorporates Zr(Y)O 2 into mullite by infiltrating partially reaction sintered (porous) mullite compacts with mixed ZrOCl 2·8H 2O and YCl 3·6H 2O solutions, corresponding to ZrO 2/Y 2O 3 = 97/3 (mol.%). The infiltration of small amount (∼7.2 wt.%) of Zr(Y)O 2 significantly improved the densification behavior and mechanical properties of mullite bodies sintered at 1620 °C, for 10 h. The mocrostructure contained a few elongated mullite crystals (aspect ratio > 6) which were embedded in a fine-grained matrix. The relatively large Zr(Y)O 2 inclusions were mainly dispersed intergranularly in the matrix, but small (<0.7 μm) inclusions were present in the grains. During sintering, the liquid phase having higher Al 2O 3 content than that of stoichiometric mullite composition formed at triple points of the mullite/mullite grains.

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