Effect of rare-earth oxides on fracture properties of ceria ceramics

The influences of the sintering additive content of rare-earth oxide (Y2O3, Gd2O3, Sm2O3) on microstructure and mechanical properties of ceria ceramics were investigated by scanning electron microscopy and small specimen technique. A small punch testing method was employed to determine the elastic m...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials science 2004-09, Vol.39 (18), p.5765-5770
Main Authors: SATO, K, YUGAMI, H, HASHIDA, T
Format: Article
Language:English
Subjects:
Applied sciences
Axial stress
Building materials. Ceramics. Glasses
Ceramic industries
Ceramics
Cerium oxides
Chemical industry and chemicals
Condensed matter: structure, mechanical and thermal properties
Diamond pyramid hardness tests
Electrotechnical and electronic ceramics
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fatigue, brittleness, fracture, and cracks
Fracture toughness
Fuel cells
Gadolinium oxides
Grain growth
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties
Mechanical properties of solids
Modulus of elasticity
Oxygen ions
Physics
Rare earth compounds
Rare earth oxides
Scanning electron microscopy
Solid oxide fuel cells
Technical ceramics
Yttrium oxide
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The influences of the sintering additive content of rare-earth oxide (Y2O3, Gd2O3, Sm2O3) on microstructure and mechanical properties of ceria ceramics were investigated by scanning electron microscopy and small specimen technique. A small punch testing method was employed to determine the elastic modulus and biaxial fracture stress of the ceria-based ceramics, and the fracture toughness was estimated by Vickers indentation method. Grain growth in the rare-earth oxides doped ceria ceramics was significantly suppressed, compared to the pure ceria ceramics. However, the elastic modulus, fracture stress and fracture toughness were decreased significantly with increasing additive content of the rare-earth oxides, possibly due to the oxygen vacancies induced by the rare earth oxides doping. The experimental results suggest that the change in the mechanical properties should be taken into account in the use of ceria-based ceramics for solid oxide fuel cells, in addition to the improvement of oxygen ion conductivity.
ISSN:0022-2461
1573-4803
DOI:10.1023/B:JMSC.0000040087.37727.cd