Grain-size dependence of thermal-shock resistance of yttria-doped tetragonal zirconia polycrystals
- Tohoku Univ., Sendai (Japan). Faculty of Engineering
- Material Innovation Laboratory, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-11 (JP)
This paper reports the thermal-shock fracture behavior of yttria-doped tetragonal zirconia polycrystals (Y-TZP) of various grain sizes evaluated by the quenching method using water as the quenching solvent. The tetragonal-to-monoclinic phase transformation behavior of Y-TZP around cracks introduced by thermal stress was investigated by using Raman microprobe spectroscopy. The critical quenching temperature difference ({Delta}T{sub c}) of Y-TZP ceramics increased from 250{degrees} to 425{degrees}C with increasing grain size of zirconia from 0.4 to 3.0 {mu}m, while the fracture strength decreased from 900 to 680 MPa. The improvement of {Delta}T{sub c} of Y-TZP with increasing grain size of zirconia corresponded with the quantity of tetragonal-to-monoclinic phase transformation around cracks introduced by thermal stress.
- OSTI ID:
- 6022029
- Journal Information:
- Journal of the American Ceramic Society; (USA), Vol. 73:8; ISSN 0002-7820
- Country of Publication:
- United States
- Language:
- English
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Properties of yttria-tetragonal zirconia polycrystal (Y-TZP) materials after long-term exposure to elevated temperatures. Final report
Properties of yttria-tetragonal zirconia polycrystal (Y-TZP) materials after long-term exposure to elevated temperatures. Final report
Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
POLYCRYSTALS
FRACTURE PROPERTIES
ZIRCONIUM OXIDES
GRAIN SIZE
CRITICAL TEMPERATURE
CRYSTAL DOPING
ION MICROPROBE ANALYSIS
PHASE TRANSFORMATIONS
QUENCHING
RAMAN SPECTRA
TEMPERATURE DEPENDENCE
TETRAGONAL LATTICES
THERMAL SHOCK
YTTRIUM ADDITIONS
ALLOYS
CHALCOGENIDES
CHEMICAL ANALYSIS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
MECHANICAL PROPERTIES
MICROANALYSIS
MICROSTRUCTURE
NONDESTRUCTIVE ANALYSIS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SIZE
SPECTRA
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM ALLOYS
ZIRCONIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties
360204 - Ceramics
Cermets
& Refractories- Physical Properties
400101 - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures