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Effect of SiO2 and Y2O3 additives on the anisotropic grain growth of dense mullite

Published online by Cambridge University Press:  31 January 2011

T. Huang ,
M. N. Rahaman ,
T-I Mah  and
T. A. Parthasarathay
T. Huang
Affiliation:
University of Missouri, Department of Ceramic Engineering, Rolla, Missouri 65409
M. N. Rahaman
Affiliation:
University of Missouri, Department of Ceramic Engineering, Rolla, Missouri 65409
T-I Mah
Affiliation:
Materials Directorate, Wright Laboratory, WL/MLLN, Wright-Patterson Air Force Base, Ohio 45433, and UES, Inc., 4401 Dayton-Xenia Road, Dayton, Ohio 45432
T. A. Parthasarathay
Affiliation:
Materials Directorate, Wright Laboratory, WL/MLLN, Wright-Patterson Air Force Base, Ohio 45433, and UES, Inc., 4401 Dayton-Xenia Road, Dayton, Ohio 45432
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Abstract

Mullite powder with a nearly stoichiometric composition was doped with 1.5–5 wt% SiO2 or 0.5–1.0 wt% Y2O3 and hot pressed at 1525–1550 °C to produce almost fully dense materials. The effect of the additives on the grain growth of the dense systems was investigated during subsequent annealing at temperatures above that of the eutectic (∼1590 °C) for the SiO2–Al2O3 system. The average length and width of the grains were measured by image analysis of polished and etched sections. At 1750 °C, anisotropic grain growth was relatively rapid, leading to the formation of rodlike grains. Compared to the undoped mullite, the addition of SiO2 and Y2O3 produced a small reduction in the grain growth kinetics. Transmission electron microscopy revealed that the glassy second phase was concentrated at the three-grain junctions or distributed inhomogeneously at the grain boundaries. For the materials annealed at 1750 °C, the indentation fracture toughness at room temperature increased from 2.0 to 2.5 MPa m1/2 for the undoped mullite to values as high as 4.0–4.5 MPa m1/2 for the doped mullite. The implications of the data for enhancing the fracture toughness of mullite by the in situ development of a microstructure of elongated grains are considered.

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Articles
Information
Journal of Materials Research , Volume 15 , Issue 3 , March 2000 , pp. 718 - 726
Copyright
Copyright © Materials Research Society 2000

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