Sintering, microstructure, hardness, and fracture toughness behavior of Y/sub 2/O/sub 3/-CeO/sub 2/-ZrO/sub 2/

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1988.tb07528.x· OSTI ID:6238193

Duh, J G; Dai, H -T; Chiou, B -S

A wet-chemical approach is applied to derive fine powders with compositions 11 mol% CeO/sub 2/-ZrO/sub 2/, 1 mol% YO/sub 1.5/- 10 mol% CeO/sub 2/-ZrO/sub 2/, 12 mol% CeO/sub 2/-ZrO/sub 2/, and 2 mol% YO/sub 1.5/-10 mol% CeO/sub 2/-ZrO/sub 2/ by the coprecipitation method. The characteristics of the as-derived powders are evaluated through thermal analysis and electron microscopy. The sintering behavior of the calcined powders is carried out at 1400/sup 0/ and 1500/sup 0/C for 1 to 10 h. Sintered density higher than 98% of theoretical is achieved for sintering at 1400/sup 0/C for several hours. The as-sintered density dependence on the sintering condition is related to the extent of tetragonal-to-monoclinic phase transformation as well as the associated microcracks. Partial substitution by Y/sub 2/O/sub 3/ in CeO/sub 2/-ZrO/sub 2/ results in reduced grain size and tends to stabilize the tetragonal structure. Y/sub 2/O/sub 3/ is more effective than CeO/sub 2/ with respect to the grain size refinement and tetragonal stability. In addition, Y/sub 2/O/sub 3/ substitution in CeO/sub 2/-ZrO/sub 2/ increases the hardness, while it decreases the fracture toughness.

• Research Organization: Dept. of Materials Science and Engineering, National Tsing Hua Univ., Hsinchu (TW); Dept. of Materials Science and Engineering, Cornell Univ., Ithaca, NY (US)
• OSTI ID: 6238193
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 71:10; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DENSITY
ELECTRON MICROSCOPY
FABRICATION
MICROSCOPY
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POWDERS
RARE EARTH COMPOUNDS
SINTERING
STABILITY
TETRAGONAL LATTICES
THERMAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES