التفاصيل البيبلوغرافية
| العنوان: |
Reactive SPS for sol–gel alumina samples: Structure, sintering behavior, and mechanical properties |
| المؤلفون: |
Rivero Antúnez, Pedro, Cano Crespo, Rafael, Sánchez Bajo, Florentino, Domínguez Rodríguez, Arturo, Morales Flórez, Víctor |
| المساهمون: |
Universidad de Sevilla. Departamento de Física de la Materia Condensada, Ministerio de Ciencia e Innovación (MICIN). España, Junta de Andalucía, Universidad de Sevilla, Junta de Extremadura |
| بيانات النشر: |
Elsevier |
| سنة النشر: |
2022 |
| المجموعة: |
idUS - Deposito de Investigación Universidad de Sevilla |
| مصطلحات موضوعية: |
Boehmite, Fracture toughness, Reactive SPS sintering, Vickers hardness, α-Al2O3 |
| الوصف: |
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. ; Ministerio de Ciencia e Innovación PGC2018-094952-B-I00 ; Junta de Andalucía P12- FQM-1079, FQM393 ; Universidad de Sevilla PGC2018-094952-B-I00 ; Junta de Extremadura GR18081 ; Premio Mensual Publicación Científica Destacada de la US. Facultad de Física |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
English |
| Relation: |
Journal of the European Ceramic Society, 41 (11), 5548-5547.; PGC2018-094952-B-I00; P12- FQM-1079; FQM393; GR18081; https://doi.org/10.1016/j.jeurceramsoc.2021.04.060; https://idus.us.es/handle//11441/138143 |
| الاتاحة: |
https://idus.us.es/handle//11441/138143 |
| Rights: |
Attribution-NonCommercial-NoDerivatives 4.0 Internacional ; http://creativecommons.org/licenses/by-nc-nd/4.0/ ; info:eu-repo/semantics/openAccess |
| رقم الانضمام: |
edsbas.C5F049D8 |
| قاعدة البيانات: |
BASE |