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Thermal and mechanical properties of aluminum titanate–mullite composites

Published online by Cambridge University Press:  31 January 2011

Y. X. Huang ,
A. M. R. Senos  and
J. L. Baptista
Y. X. Huang
Affiliation:
Department of Ceramics and Glass Engineering, UIMC, University of Aveiro, 3810 Aveiro, Portugal
A. M. R. Senos
Affiliation:
Department of Ceramics and Glass Engineering, UIMC, University of Aveiro, 3810 Aveiro, Portugal
J. L. Baptista
Affiliation:
Department of Ceramics and Glass Engineering, UIMC, University of Aveiro, 3810 Aveiro, Portugal
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Abstract

The thermal and mechanical properties of aluminum titanate–mullite composites prepared by a gel-coated powder processing method, namely a mullite precursor gel coating aluminum titanate particles (containing 2.5 wt% MgO), were investigated. A microstructure with both elongated and equiaxed mullite grains was observed in the composite samples. Both the mechanical strength and the thermal expansion coefficient increased with the mullite amount. The mechanical strength showed a strong dependence on the grain size of aluminum titanate with an exponent of −3. Inhibition of aluminum titanate grain growth due to the presence of the mullite phase enhanced the mechanical strength of the composites. The thermal shock resistance tended to decrease as the mullite content increased. The thermal stability of aluminum titanate was improved in the present composite system.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 2 , February 2000 , pp. 357 - 363
Copyright
Copyright © Materials Research Society 2000

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