Title

Mechanical Properties of Ce0.9Gd0.1O2-x and Ce0.9Gd0.1O2-x+Al2O3 Composites

Abstract

The room-temperature elastic moduli, fracture strength, and fracture toughness of dense, fine-grained, pure Ce0.9Gd0.1O1.95 and composites containing 1.3 and 9.1 wt.% Al2O3 were investigated. Addition of 9.1 wt.% Al2O3 to Ce0.9Gd0.1O1.95 changed the fracture mode from intergranular to transgranular and increased room-temperature fracture strength from 65 to 125 MPa and fracture toughness from 1.3 to 1.6 MPam1/2. In addition, steady-state compressive creep was measured for Ce0.9Gd0.1O1.95 and the Ce0.9Gd0.1O2-x+9.1 wt.% Al2O3 composite. The stress exponent ≈1.3 and the activation energy ≈480 kJ/mole for Ce0.9Gd0.1O1.95 suggested diffusional flow controlled by the cations. There was no difference in creep rate between Ce0.9Gd0.1O2-x and the composite.

Meeting Name

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures (1998: Jan. 20-24, Cocoa Beach, FL)

Department(s)

Materials Science and Engineering

Keywords and Phrases

Activation energy; Alumina; Cerium compounds; Compressive strength; Creep; Elastic moduli; Fracture toughness; Compressive creep; Ceramic materials

International Standard Serial Number (ISSN)

0196-6219

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1998 American Ceramic Society, All rights reserved.

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