Crack Healing, Reopening and Thermal Expansion Behavior of Al2TiO5 Ceramics at High Temperature

Abstract:

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The low thermal expansion (α25-1100oC = 0.05 ~ 1.6 × 10–6/K) of Al2TiO5 ceramics are apparently due to a combination of grain boundary micro cracking caused by the large thermal expansion anisotropy of the crystal axes of the Al2TiO5 phase. During the reheating run, the individual crystallites expanded at low temperature; thus, the solid volume of the specimen expanded into the micro cracks, where as the macroscopic dimensions remained almost unchanged. As a result, the material expanded very little. The micro cracks closed at higher temperatures. This result is closely related to relatively steeper thermal expansion curves.

Info:

Periodical:

Key Engineering Materials (Volumes 336-338)

Edited by:

Wei Pan and Jianghong Gong

Pages:

2448-2450

DOI:

10.4028/www.scientific.net/KEM.336-338.2448

Citation:

I. J. Kim et al., "Crack Healing, Reopening and Thermal Expansion Behavior of Al2TiO5 Ceramics at High Temperature", Key Engineering Materials, Vols. 336-338, pp. 2448-2450, 2007

Online since:

April 2007

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Price:

$35.00

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