Analytical TEM of grain boundary phases in yttria-zirconia ceramics

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6512006

Mecartney, M L; Angelini, P

Yttria-zirconia ceramics have a broad range of applications, from use as structural materials (tetragonal zirconia) to ionic conductors (cubic zirconia). Similar to many ceramic materials, these zirconia ceramics often contain small amounts of amorphous silicate phases at grain boundaries and multiple grain junctions. These phases are a result of impurities, introduced during processing or from the original raw material, or are deliberate additions to aid in the densification via liquid phase sintering. Despite the universality of these grain boundary phases, as of yet little work has been undertaken to understand their effect on the microstructural development, chemistry, and physical properties of the materials. We report here our results on analyzing a series of yttria doped zirconia ceramics to which deliberate additions of various glass phases have been added. The addition of various glass phases has been observed to have profoundly different effects on grain growth and chemical composition of yttria-zirconia ceramics. These effects can be correlated directly with the solubility of the ceramic constituents in the various amorphous phases, as determined by analytical TEM.

• Research Organization: Minnesota Univ., Minneapolis (USA). Dept. of Chemical Engineering and Materials Science; Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6512006
• Report Number(s): CONF-870862-8; ON: DE87010400
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
BOROSILICATE GLASS
CHALCOGENIDES
CRYSTAL STRUCTURE
DOPED MATERIALS
ELECTRON MICROSCOPY
GLASS
GRAIN GROWTH
MATERIALS
MICROSCOPY
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES