Sol-Gel Processing and Sintering of Aluminum Titanate

Author

C. S. Tseng
M. N. Rahaman, Missouri University of Science and TechnologyFollow

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.

Recommended Citation

C. S. Tseng and M. N. Rahaman, "Sol-Gel Processing and Sintering of Aluminum Titanate," Journal of Materials Synthesis and Processing, vol. 4, no. 2, pp. 79 - 87, Springer GmbH & Co, Mar 1996.

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

1064-7562

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1996 Springer GmbH & Co, All rights reserved.

Publication Date

01 Mar 1996