A first study of the high-temperature plasticity of ceria-doped zirconia polycrystals

Ceria–zirconia ceramic alloys were sintered by high-temperature annealing, considering several synthesis temperatures to obtain a full-dense ceria–zirconia ceramic material using a temperature as low as possible. It was found that fully density is achieved at temperatures of 1450 °C. Monolithic spec...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2010-12, Vol.30 (16), p.3357-3362
Main Authors: de Bernardi-Martín, Santiago, Gómez-García, Diego, Domínguez-Rodríguez, Arturo, de Portu, Goffredo
Format: Article
Language:English
Subjects:
Alloys
Annealing
CeO 2
Ceramics
Constitutive relationships
Creep
Creep (materials)
Deformation mechanism
Density
Empirical equations
Grain boundary sliding
Microstructure
Plasticity
Switching
Zirconium dioxide
ZrO 2
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Summary:Ceria–zirconia ceramic alloys were sintered by high-temperature annealing, considering several synthesis temperatures to obtain a full-dense ceria–zirconia ceramic material using a temperature as low as possible. It was found that fully density is achieved at temperatures of 1450 °C. Monolithic specimens were crept under compression at high temperatures. The creep results fitted an empirical constitutive equation consistent with a classical Ratchinger mechanism for grain switching. This result was confirmed through microstructural characterization of as-received and post-mortem specimens. Since the conventional Ashby–Verrall model is contrary to the mechanism controlling creep in other zirconia alloys, the results are considered in the framework of a new grain boundary sliding model, with particular discussion of the validity of that model for the ceria–zirconia case.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2010.07.043