Artículo
Reactive SPS for sol–gel alumina samples: Structure, sintering behavior, and mechanical properties
Autor/es | Rivero Antúnez, Pedro
Cano Crespo, Rafael Sánchez Bajo, Florentino Domínguez Rodríguez, Arturo Morales Flórez, Víctor |
Departamento | Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Fecha de publicación | 2021 |
Fecha de depósito | 2022-10-19 |
Publicado en |
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Premios | Premio Mensual Publicación Científica Destacada de la US. Facultad de Física |
Resumen | This work presents a fast and direct controlled routine for the fabrication of fully dense alumina based on the reactive spark plasma sintering (reactive-SPS) of boehmite (γ-AlOOH) nano-powders obtained by the sol–gel ... This work presents a fast and direct controlled routine for the fabrication of fully dense alumina based on the reactive spark plasma sintering (reactive-SPS) of boehmite (γ-AlOOH) nano-powders obtained by the sol–gel technique. The evolution of the transition aluminas during sintering has been studied. Some boehmite powders were seeded with α-Al2O3 particles prior to the gelation. Boehmite seeded powders exhibited a direct transition to α-Al2O3 at 1070 °C, enhancing the transformation kinetics and lowering the required temperature by more than 100 °C. For comparison, other samples were prepared by previously annealing the seeded and unseeded boehmite powders. Thus, α-Al2O3 powders were obtained and were sintered by standard-SPS. A detailed structural and mechanical characterization is presented, comparing the hardness and indentation fracture resistance for different grain sizes and porosities. Both the reactive-SPSed samples and the standard-SPSed samples showed a high hardness (18–20 GPa), whereas the reactive-SPSed samples exhibited a lower indentation fracture resistance due to a large grain size (∼10 μm). Improvements of this procedure for obtaining smaller grain size are discussed. In summary, the presented technique brings a revolutionary fast method for the fabrication of fully dense alumina, as this process reduces the time and temperature required for alumina densification. |
Agencias financiadoras | Ministerio de Ciencia e Innovación (MICIN). España Junta de Andalucía Universidad de Sevilla Junta de Extremadura |
Identificador del proyecto | PGC2018-094952-B-I00
P12- FQM-1079 FQM393 PGC2018-094952-B-I00 GR18081 |
Cita | Rivero Antúnez, P., Cano Crespo, R., Sánchez Bajo, F., Domínguez Rodríguez, A. y Morales Flórez, V. (2021). Reactive SPS for sol–gel alumina samples: Structure, sintering behavior, and mechanical properties. Journal of the European Ceramic Society, 41 (11), 5548-5547. https://doi.org/10.1016/j.jeurceramsoc.2021.04.060. |
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