Fracture strength-fracture resistance response and damage resistance of sintered Al[sub 2]O[sub 3]-ZrO[sub 2] (12 mol% CeO[sub 2]) composites

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb04662.x· OSTI ID:6765240

Becher, P F; Warwick, W H ^[1]

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1. Oak Ridge National Lab., TN (United States). Metals and Ceramics Division

The fracture strengths of sintered Al[sub 2]O[sub 3] containing 20 and 40 vol% ZrO[sub 2](12 mol% CeO[sub 2])--zirconia-toughened alumina (ZTA)--composites along with the fracture resistance can be increased (e.g., to [approximately]900 MPa and >12 MPa[center dot]m[sup 1/2], respectively), by increasing the mean grain size of the t-ZrO[sub 2] (and the Al[sub 2]O[sub 3]) from [approximately]0.5 [mu]m to [approximately]3 [mu]m. At these lower t-ZrO[sub 2] contents, the fracture strength-fracture resistance curves show a continuous rise as opposed to the strength maxima observed in polycrystalline t-ZrO[sub 2] (12 mol% CeO[sub 2]), CeTZP, and ZrO[sub 2] (12 mol% CeO[sub 2]) ceramics containing [<=] 20 vol% Al[sub 2]O[sub 3]. The toughened composites also exhibit excellent damage resistance with fracture strengths of 500 MPa retained with surfaces containing [approximately]150-N Vickers indentations which produce cracks off [approximately]160-[mu]m radius. Greater damage resistance correlates with an increase in the apparent R-curve response of these composites.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6765240
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:10; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COMPARATIVE EVALUATIONS
COMPOSITE MATERIALS
DAMAGE
DATA
EVALUATION
EXPERIMENTAL DATA
FRACTURE PROPERTIES
INFORMATION
MATERIALS
MECHANICAL PROPERTIES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES