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Title

High-temperature compressive creep of novel fine-grained orthorhombic ZrO2 ceramics stabilized with 12 mol% Ta doping

AuthorsSponchia, Gabriele; Moshtaghioun, Bibi Malmal; Riello, Prieto; Benedetti, Alvise; Gómez-García, D. ; Domínguez-Rodríguez, Domingo; Ortiz, Angel L.
KeywordsZrO2 ceramics
Creep
High-temperature mechanical properties
Spark-plasma sintering
Issue DateMay-2018
PublisherElsevier
CitationJournal of the European Ceramic Society 38(5): 2445-2448 (2018)
AbstractA novel fine-grained orthorhombic ZrO2 ceramic stabilized with 12 mol% Ta doping was fabricated by spark-plasma sintering from home-made powders, and its high-temperature mechanical properties evaluated for the first time by compressive creep tests in both Ar and air. It was found that the high-temperature plasticity of the ceramic deformed in Ar, under which the Ta-doped orthorhombic ZrO2 is a black suboxide with abundant oxygen vacancies in its crystal structure, is controlled by grain boundary sliding (stress exponent ∼2, and activation energy ∼780–800 kJ/mol). However, the high-temperature plasticity of the ceramic deformed in air, under which the Ta-doped orthorhombic ZrO2 is a white oxide due to the elimination in situ of oxygen vacancies, is controlled by recovery creep (stress exponent ∼3, and activation energy ∼750 kJ/mol). It was also observed that black Ta-doped orthorhombic ZrO2 is more creep resistant than its white counterpart with the same grain size, and that the former deforms as the more conventional Y2O3-stabilized ZrO2 does.
Publisher version (URL)https://doi.org/10.1016/j.jeurceramsoc.2017.12.055
URIhttp://hdl.handle.net/10261/194098
DOI10.1016/j.jeurceramsoc.2017.12.055
ISSN0955-2219
Appears in Collections:(ICMS) Artículos
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