High temperature plastic deformation of multilayered YTZP/ZTA composites obtained by tape casting

Jiménez–Melendo, M.; Clauss, C.; ́guez, A. Domi ́nguez-Rodri; Portu, Goffredo de; Roncari, E.; Pinasco, Paola

doi:10.1016/s1359-6454(98)00066-4

Cited by 35 publications

(23 citation statements)

References 39 publications

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“…This model has been successfully used to explain the high-temperature mechanical behavior of laminated metal 33 and ceramic 9,34 composites. Owing to the higher creep strength of the alumina phase in comparison with ZTA, Eq.…”

Section: Discussionmentioning

confidence: 99%

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Creep mechanisms of laminated alumina/zirconia-toughened alumina composites

Morales-Rodrı́guez

Domínguez‐Rodríguez

Portu

et al. 2009

Journal of the European Ceramic Society

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Section: Discussionmentioning

confidence: 99%

“…9 Discs with a diameter of 40 mm were cut from the green ceramic sheets and then stacked and warm-pressed at 80 • C for 30 min at 30 MPa. The structure was designed to have alumina layers as outer surfaces.…”

Section: Methodsmentioning

confidence: 99%

Creep mechanisms of laminated alumina/zirconia-toughened alumina composites

Morales-Rodrı́guez

Domínguez‐Rodríguez

Portu

et al. 2009

Journal of the European Ceramic Society

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“…Se conoce que la presencia de ZrO 2 en forma de segundas fases inhibe el crecimiento de los granos de alúmina comparado con el material monofásico (14). Esta elevada resistencia al crecimiento de grano a temperaturas elevadas se ha utilizado ampliamente en los últimos años para obtener un comportamiento superplás-tico (6,15), que contrasta con la característica fragilidad de la alúmina pura. Aunque se desconoce el origen de esta reducida velocidad de crecimiento de grano, se ha sugerido que proviene del aumento de las trayectorias de difusión por la interconexión de las fases de Al 2 O 3 y ZrO 2 (14).…”

Section: Resultados Y Discusiónunclassified

Microestructura de Al2O3/TZP codopado con Fe2O3 y TiO2 fabricado por reacción (RBAO)

Morales¹,

Bravo²,

Domínguez³

et al. 2003

Bol. Soc. Esp. Ceram. Vidr.

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Se han fabricado compuestos de 80% vol. Al 2 O 3 /TZP (ZrO 2 estabilizada con 2% mol Y 2 O 3 ) codopados con 1% vol. Fe 2 O 3 y 1% vol. TiO 2 mediante la tecnología RBAO ("Reaction Bonding of Aluminum Oxide"), que se han sinterizado libremente (1450 ºC, 60 min) y bajo carga uniaxial (20 MPa, 1200 ºC, 60 min). Se ha caracterizado la microestructura mediante microscopía electrónica de barrido. Ambos materiales son densos con una microestructura homogénea formada por granos de alúmina y de circona, sin fases en juntas de grano. En el caso de la sinterización bajo carga, la distribución del tamaño de los poros es muy estrecha, y esencialmente menor que las correspondientes a los granos de Al 2 O 3 y TZP. El codopado promueve la sinterización de la alúmina, mientras que los granos dispersos de circona inhiben su crecimiento de grano. Los ensayos preliminares de flexión en cuatro puntos realizados sobre los materiales sinterizados sin carga indican una resistencia a la fractura superior a la que presentan los compuestos fabricados convencionalmente. Reaction-bonded 80 vol% Al 2 O 3 /TZP (2 mol% Y 2 O 3 -stabilized tetragonal zirconia polycrystals) composites co-doped with 1 vol% Fe 2 O 3 and 1 vol% TiO 2 have been produced, and then presureless sintered (1450 ºC, 60 min) or sinter-forged (20 MPa, 1200 ºC, 60 min). The resulting microstructures have been characterized using scanning electron microscopy. Both types of materials are dense, with a fine and homogeneous dual microstructure consisting of Al 2 O 3 and TZP grains without intermediate grain boundary phases. Sinter-forged composites exhibit a very narrow pore size distribution, essentially smaller than the grain size of the alumina and zirconia phases. Co-doping promotes the sintering of alumina at lower temperatures, while still retains a fine grain size due to the presence of the dispersed zirconia phase. First results on presureless sintered RBAO materials show a fracture strength higher than in conventionally sintered and sinter-forged composites. Keywords INTRODUCCIÓNDesde hace dos décadas, los materiales cerámicos están experimentando un gran auge como candidatos idóneos para un amplio abanico de aplicaciones estructurales, debido a que son generalmente más duros, resistentes y ligeros que los metales. Además, son capaces de mantener una elevada resistencia a la deformación a altas temperaturas, incluso en ambientes agresivos. Sin embargo, las potenciales aplicaciones de los materiales cerámicos están condicionadas por su fragilidad, que da lugar a fracturas catastróficas repentinas y a una baja resistencia a los choques térmicos.Este pobre comportamiento mecánico se debe frecuentemente a los defectos internos introducidos durante el procesado, que provienen de inhomogeneidades (aglomerados, inclusiones orgánicas, etc.) presentes en el material en verde. Para minimizar la introducción y/o propagación de estos defectos, se han desarrollado en los últimos años diversas estrategias y técnicas de fabricación específicas de materiales cerámicos (1). Para los c...

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“…Based on the literature, there are many methods of molding ceramic materials [9][10][11]. Among them are methods such as tape casting [12,13], gel casting [14,15], and slip casting [16,17] or stereolithography [18]. However, note that it is the choice of method for fabricating fittings that determines the properties of the resulting product.…”

Section: Introductionmentioning

confidence: 99%

Sintering Behavior, Thermal Expansion, and Environmental Impacts Accompanying Materials of the Al2O3/ZrO2 System Fabricated via Slip Casting

et al. 2021

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This work focuses on research on obtaining and characterizing Al2O3/ZrO2 materials formed via slip casting method. The main emphasis in the research was placed on environmental aspects and those related to the practical use of ceramic materials. The goal was to analyze the environmental loads associated with the manufacturing of Al2O3/ZrO2 composites, as well as to determine the coefficient of thermal expansion of the obtained materials, classified as technical ceramics. This parameter is crucial in terms of their practical applications in high-temperature working conditions, e.g., as parts of industrial machines. The study reports on the four series of Al2O3/ZrO2 materials differing in the volume content of ZrO2. The sintering process was preceded by thermogravimetric measurements. The fabricated and sintered materials were characterized by dilatometric study, scanning electron microscopy, X-ray diffraction, and stereological analysis. Further, life cycle assessment was supplied. Based on dilatometric tests, it was observed that Al2O3/ZrO2 composites show a higher coefficient of thermal expansion than that resulting from the content of individual phases. The results of the life cycle analysis showed that the environmental loads (carbon footprint) resulting from the acquisition and processing of raw materials necessary for the production of sinters from Al2O3 and ZrO2 are comparable to those associated with the production of plastic products such as polypropylene or polyvinyl chloride.

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High temperature plastic deformation of multilayered YTZP/ZTA composites obtained by tape casting

Cited by 35 publications

References 39 publications

Creep mechanisms of laminated alumina/zirconia-toughened alumina composites

Creep mechanisms of laminated alumina/zirconia-toughened alumina composites

Microestructura de Al<sub>2</sub>O<sub>3</sub>/TZP codopado con Fe<sub>2</sub>O<sub>3</sub> y TiO<sub>2</sub> fabricado por reacción (RBAO)

Sintering Behavior, Thermal Expansion, and Environmental Impacts Accompanying Materials of the Al2O3/ZrO2 System Fabricated via Slip Casting

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