Accelerated Aging in 3 mol%-Yttria-Stabilized Tetragonal Zirconia Ceramics Sintered in Reducing Conditions
Jos\'e Bartolom\'e, Isabel Montero, Marcos Diaz, Sonia Lopez-Esteban,, Jos\'e S. Moya, Sylvain Deville, Laurent Gremillard, J\'er\^ome Chevalier,, Gilbert Fantozzi
TL;DR
This study investigates how sintering conditions affect the aging and phase transformation of 3Y-TZP ceramics in water vapor at 140°C, revealing that reducing conditions increase monoclinic transformation due to oxygen vacancies and Fe2+ exolution.
Contribution
It demonstrates that reducing sintering atmospheres accelerate aging in 3Y-TZP ceramics by increasing oxygen vacancies and forming new phases at grain boundaries.
Findings
Reducing conditions lead to higher tetragonal-to-monoclinic transformation.
Oxygen vacancy concentration increases under reducing sintering.
Fe2+ ions exsolve and form new phases at grain boundaries.
Abstract
The aging behavior of 3-mol%-yttria-stabilized tetragonal zirconia (3Y-TZP) ceramics sintered in air and in reducing conditions was investigated at 140{\deg}C in water vapor. It was observed by X-ray diffraction (XRD) that 3Y-TZP samples sintered in reducing conditions exhibited significantly higher tetragonal-to-monoclinic transformation than samples with similar density and average grain size values but obtained by sintering in air. This fact is explained by the increase of the oxygen vacancy concentration and by the presence at the grain boundary region of a new aggregate phase formed because of the exolution of Fe2+ ions observed by X-ray photoelectron spectroscopy.
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