Sintering of ceria-doped tetragonal zirconia crystallized in organic solvents, water, and air

Journal Article · Sun Mar 01 04:00:00 EST 1992 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1992.tb07841.x· OSTI ID:5046951

Sato, T; Dosaka, K; Yoshioka, T; Okuwaki, A ^[1]; Torii, K; Onodera, Y ^[2]

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1. Dept. of Molecular Chemistry and Engineering, Faculty of Engineering, Tohoku Univ., Sendai 980 (JP)
2. Government Industrial Research Inst., Tohoku, Sendai 983 (JP)

This paper reports on amorphous CeO{sub 2}--ZrO{sub 2} gels that were prepared by coprecipitation in ammonia solutions. The onset of crystallizaton of the gels, from calcining in air, was 420{degrees}C, while 200{degrees} to 250{degrees}C in the presence of water and organic solvents such as methanol and ethanol. The sintering behaviors of CeO{sub 2}--ZrO{sub 2} powders were sensitive to the crystallizing conditions, since hard agglomerates formed when the precipitated gels were crystallized by normal calcination in air, whereas soft agglomerates formed when they were crystallized in water or organic solvents. CeO{sub 2}--ZrO{sub 2} powders crystallized in methanol and water at 250{degrees}C were sintered to full theoretical density at 1150{degrees} and 1400{degrees}C, respectively, whereas that crystallized by calcination in air at 450{degrees}C was sintered to only 95.2% of theoretical density, even at 1500{degrees}C.

• OSTI ID: 5046951
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 75:3; ISSN JACTA; ISSN 0002-7820
• 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
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
AIR
ALLOYS
AMORPHOUS STATE
CALCINATION
CERIUM ADDITIONS
CERIUM ALLOYS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COLLOIDS
COPRECIPITATION
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DECOMPOSITION
DENSITY
DISPERSIONS
DOPED MATERIALS
FABRICATION
FLUIDS
GASES
GELS
HYDROGEN COMPOUNDS
MATERIALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
POLYCRYSTALS
PRECIPITATION
PYROLYSIS
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
SEPARATION PROCESSES
SINTERING
SOLVENT PROPERTIES
SYNTHESIS
TETRAGONAL LATTICES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
WATER
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES