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Title:
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Chemical and nanoindentation study of diffusion during sintering of 12Ce-ZrO2/3Y-ZrO2 powder layers
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Author:
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Roa Rovira, Joan Josep; Turón Viñas, Miquel; Tovar Vargas, Daniela; Ledesma, J.; Anglada Gomila, Marcos Juan
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Micromecànica i Fiabilitat dels Materials |
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Abstract:
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Tetragonal zirconia polycrystals doped with 3% mol of yttria (3Y-ZrO2) exhibit excellent mechanical properties and biocompatibility. However, under humid environments, their surface structural integrity is degraded by aging (low temperature degradation). Co-doping with Ceria by starting from mixtures of 3Y-ZrO2 and 12Ce-ZrO2 powders can increase the resistance to low temperature degradation. In this study, systematic chemical and nanomechanical measurements have been conducted in powder multilayers of the12Ce-ZrO2/3Y-ZrO2 system after sintering at different temperatures (from 1400 to 1600°C) during 2h in order to measure the distribution of diffusion of stabilizer solutes. The results indicate that the diffusion process zone at the 12Ce-ZrO2/3Y-ZrO2 interface increases with sintering temperature by following an Arrhenius equation. Measuring the hardness by nanoindentation through the diffusion zone gives similar activation energy at high sintering temperatures. At low sintering temperatures, nanoindentation has not enough resolution at low sintering temperatures for the sintering time used. |
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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria dels materials
-Diffusion
-Chemical analysis
-12Ce-ZrO2/3Y-ZrO2 interface
-Chemical analysis
-Diffusion
-Micromechanical properties
-Wavelength dispersive spectrometry
-Difusió (Física)
-Química |
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Rights:
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Document type:
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Article - Published version
Article |
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