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Microestructura de AI2O3/TZP codopado con Fe2O3 y TiO2 fabricado por reacción (RBAO)

 

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Opened Access Microestructura de AI2O3/TZP codopado con Fe2O3 y TiO2 fabricado por reacción (RBAO)
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Author: Domínguez Rodríguez, Arturo
Jiménez Melendo, Manuel
Bravo León, Alfonso
Morales Rodríguez, Ana
Date: 2003
Published in: Boletín de la Sociedad Española de Cerámica y Vidrio, 42, 5-8.
Document type: Article
Abstract: Se han fabricado compuestos de 80% vol. Al2 O3/TZP (ZrO2 estabilizada con 2% mol Y2 O3) codopados con 1% vol. Fe2 O3 y 1% vol. TiO2 mediante la tecnología RBAO (“Reaction Bonding of Aluminum Oxide”), que se han sinterizado libremente (1450 ºC, 60 ...
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Reaction-bonded 80 vol% Al2O3/TZP (2 mol% Y2 O3-stabilized tetragonal zirconia polycrystals) composites co-doped with 1vol% Fe2 O3 and 1 vol% TiO2 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 Al2 O3 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.
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URI: http://hdl.handle.net/11441/17583

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