Title

Freeze-spray Processing of Layered Ceramic Composites

Abstract

Thermal gradients and associated stresses are critical in designing with ceramic composites having low thermal conductivity. In order to reduce the stresses from thermal gradients, compositional gradients are employed in designing of composite structures. This study addresses development of freeze-spray process to fabricate layered ceramic structures with controlled layer thickness and microstructural development. The composites were processed by spraying of ceramic slurries with low binder content and relatively high solids loadings (up to 40 vol%) on a cooled substrate. The frozen parts were freeze-dried and sintered at elevated temperatures. The relationship between microstructural development and thermal expansion behavior of Al2O3 and Y2O3-stabilized ZrO2 functionally graded ceramic composites is discussed.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Ceramic Composites; Ceramic Slurries; Cooled Substrate; Freeze-Spray; Low Binder Content; Stresses; Thermal Expansion; Thermal Gradients

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2006 University of Texas Press, All rights reserved.

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