Title

Sol-Gel Processing and Sintering of Aluminum Titanate

Abstract

Amorphous powders of aluminum titanate, Al2TiO5, were prepared by a sol-gel process followed by supercritical drying with extraction of CO2. Constant-heating rate sintering (5°C/min) of the powder compacts produced an almost fully dense material below ≈ 1380°C but the transformation to the crystalline Al2TiO5 phase was incomplete. Above ≈ 1380°C, nearly complete transformation occurred but the microstructure showed extensive microcracking. The microcracked Al2TiO5 material produced above ≈ 1380°C had a low, negative linear thermal expansion coefficient (≈ -10-6°C-1) below ≈600°C and showed hysteresis in the thermal expansion behavior. As a comparison, Al2TiO5 was also prepared by the more conventional route of solid-state reaction between Al2O3 and TiO2 powders. Under the same sintering conditions, the densities of the materials fabricated by the conventional route were far inferior to those obtained by the sol-gel route.

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

10647562

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1996 Springer GmbH & Co, All rights reserved.

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