Artículo
Anomalous high activation energy for creep in nanostructured 3YTZP/Ni cermets
Autor/es | Morales Rodríguez, Ana
Gómez García, Diego Rodríguez Suárez, T. López Esteban, S. Pecharroman, Carlos Moya, J. S. Domínguez Rodríguez, Arturo |
Departamento | Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Fecha de publicación | 2007 |
Fecha de depósito | 2024-01-11 |
Publicado en |
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Resumen | The plastic behavior of cermets based on a 3 mol% yttria-stabilized tetragonal zirconia matrix that incorporates nanometric nickel inclusions (3YTZP/n-Ni), with 2.5, 5 and 10 vol.% of nickel content, has been studied by ... The plastic behavior of cermets based on a 3 mol% yttria-stabilized tetragonal zirconia matrix that incorporates nanometric nickel inclusions (3YTZP/n-Ni), with 2.5, 5 and 10 vol.% of nickel content, has been studied by constant load tests in compression carried out in argon atmosphere. The microstructure of these composites consists of nanometric nickel inclusions homogeneously dispersed into a fine-grained zirconia matrix (about 200 nm). The microstructural and mechanical results obtained show that the creep behavior is controlled by the zirconia matrix as in 3YTZP-based cermets with micrometric Ni inclusions (3YTZP/μ-Ni); whereas the stress exponent values are similar to those of high-purity monolithic 3YTZPs, anomalous high values of the activation energy have been measured. The ceramic/metal interface plays a crucial role for creep properties; the strong TZP/n-Ni interface matching can be at the origin of these high values of the activation energies for creep. |
Agencias financiadoras | Ministerio de Educación y Ciencia (MEC). España |
Identificador del proyecto | MAT2003-04199-CO2 |
Cita | Morales Rodríguez, A., Gómez García, D., Rodríguez Suárez, T., López Esteban, S., Pecharroman, C., Moya, J.S. y Domínguez Rodríguez, A. (2007). Anomalous high activation energy for creep in nanostructured 3YTZP/Ni cermets. Journal of the European Ceramic Society, 27 (11), 3295-3299. https://doi.org/10.1016/j.jeurceramsoc.2007.02.179. |
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