| Texto completo | |
| Autor(es): |
Monteiro, Fabulo Ribeiro
;
Storion, Ana Gabriela
;
Ramos, Kethlinn
;
Jesus, Lilian Menezes
;
Perez-Coll, Domingo
;
Mather, Glenn C.
;
Chinelatto, Adilson Luiz
;
Pallone, Eliria Maria de Jesus Agnolon
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CERAMICS INTERNATIONAL; v. 49, n. 22, p. 10-pg., 2023-10-04. |
| Resumo | |
The flash phenomenon in flash sintering of ceramic materials is closely related to electrical conductivity of the material. However, our understanding of how particle-to-particle contact of ceramic powders affects this phenomenon and, consequently, the microstructure and electrical properties of flash-sintered materials remains limited. To address this, we utilized "pseudo-in-situ" impedance spectroscopy to investigate the effect of particle to-particle contact in nanometric powders of ZnO and 8YSZ, both before and after flash sintering. The powders were prepared using two different procedures, either grinding with a binder or employing multiple milling and calcining steps. After compacting into pellets, the samples were characterized before and after flash sintering, either with current-to-voltage control or with the application of current density ramps until the flash event occurred. Pseudo-in-situ impedance was employed to demonstrate that preparing powders using multiple milling and calcining steps improved charge-carrier mobility paths, facilitated homogeneous passage of electric current, reduced thermal gradients, and consequently resulted in better microstructural homogeneity and electrical conductivity. In addition, the use of the electric-current ramp control retained microstructural homogeneity to a greater degree. (AU) | |
| Processo FAPESP: | 15/07319-8 - Estudo de sinterização ultra rápida e de baixo consumo energético: flash Sintering |
| Beneficiário: | Eliria Maria de Jesus Agnolon Pallone |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 19/14677-9 - Influência da técnica Multi Step Flash Sintering no controle microestrutural da ZrO2 |
| Beneficiário: | Eliria Maria de Jesus Agnolon Pallone |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |