Preparation of zirconia-mullite composites by an infiltration route

H C Park; T Y Yang; S Y Yoon; R Stevens

doi:10.1016/j.msea.2005.06.005

Preparation of zirconia-mullite composites by an infiltration route

H C Park, T Y Yang, S Y Yoon, R Stevens

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

33 Citations (SciVal)

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(.)8H(2)O and YCl(3)(.)6H(2)O solutions, corresponding to ZrO2/Y2O3 = 97/3 (mol.%). The infiltration of small amount (similar to 7.2 wt.%) of Zr(Y)O-2 significantly improved the densification behavior and mechanical properties of mullite bodies sintered at 1620 degrees 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)02 inclusions were mainly dispersed intergranularly in the matrix, but small (< 0.7 mu m) inclusions were present in the grains. During sintering, the liquid phase having higher Al2O3 content than that of stoichiometric mullite composition formed at triple points of the mullite/mullite grains. (c) 2005 Published by Elsevier B.V

Original language	English
Pages (from-to)	233-238
Number of pages	6
Journal	Materials Science and Engineering A
Volume	405
Issue number	1-2
DOIs	https://doi.org/10.1016/j.msea.2005.06.005
Publication status	Published - 2005

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title = "Preparation of zirconia-mullite composites by an infiltration route",

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(.)8H(2)O and YCl(3)(.)6H(2)O solutions, corresponding to ZrO2/Y2O3 = 97/3 (mol.%). The infiltration of small amount (similar to 7.2 wt.%) of Zr(Y)O-2 significantly improved the densification behavior and mechanical properties of mullite bodies sintered at 1620 degrees 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)02 inclusions were mainly dispersed intergranularly in the matrix, but small (< 0.7 mu m) inclusions were present in the grains. During sintering, the liquid phase having higher Al2O3 content than that of stoichiometric mullite composition formed at triple points of the mullite/mullite grains. (c) 2005 Published by Elsevier B.V",

author = "Park, {H C} and Yang, {T Y} and Yoon, {S Y} and R Stevens",

year = "2005",

doi = "10.1016/j.msea.2005.06.005",

language = "English",

volume = "405",

pages = "233--238",

journal = "Materials Science and Engineering A",

issn = "0921-5093",

publisher = "Elsevier",

number = "1-2",

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TY - JOUR

T1 - Preparation of zirconia-mullite composites by an infiltration route

AU - Park, H C

AU - Yang, T Y

AU - Yoon, S Y

AU - Stevens, R

PY - 2005

Y1 - 2005

N2 - 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(.)8H(2)O and YCl(3)(.)6H(2)O solutions, corresponding to ZrO2/Y2O3 = 97/3 (mol.%). The infiltration of small amount (similar to 7.2 wt.%) of Zr(Y)O-2 significantly improved the densification behavior and mechanical properties of mullite bodies sintered at 1620 degrees 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)02 inclusions were mainly dispersed intergranularly in the matrix, but small (< 0.7 mu m) inclusions were present in the grains. During sintering, the liquid phase having higher Al2O3 content than that of stoichiometric mullite composition formed at triple points of the mullite/mullite grains. (c) 2005 Published by Elsevier B.V

AB - 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(.)8H(2)O and YCl(3)(.)6H(2)O solutions, corresponding to ZrO2/Y2O3 = 97/3 (mol.%). The infiltration of small amount (similar to 7.2 wt.%) of Zr(Y)O-2 significantly improved the densification behavior and mechanical properties of mullite bodies sintered at 1620 degrees 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)02 inclusions were mainly dispersed intergranularly in the matrix, but small (< 0.7 mu m) inclusions were present in the grains. During sintering, the liquid phase having higher Al2O3 content than that of stoichiometric mullite composition formed at triple points of the mullite/mullite grains. (c) 2005 Published by Elsevier B.V

U2 - 10.1016/j.msea.2005.06.005

DO - 10.1016/j.msea.2005.06.005

M3 - Article

SN - 0921-5093

VL - 405

SP - 233

EP - 238

JO - Materials Science and Engineering A

JF - Materials Science and Engineering A

IS - 1-2

ER -

Preparation of zirconia-mullite composites by an infiltration route

Abstract

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