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

Comments

Report number: AFRL-ML-WP-TP-2006-430 Contract/Grant number: Fa8650-04-C-5704

Keywords and Phrases

STINFO (Scientific and Technical Information); Freeze Sprays; Ceramic Composites; PE78011F; WUAFRL286525100000

Document Type

Technical Report

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2026 Defense Technical Information Center, All rights reserved

Publication Date

2006-04-01

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