| Grant number: | 20/05250-9 |
| Support type: | Regular Research Grants |
| Duration: | August 01, 2020 - July 31, 2022 |
| Field of knowledge: | Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials |
| Principal Investigator: | Reginaldo Muccillo |
| Grantee: | Reginaldo Muccillo |
| Home Institution: | Instituto de Pesquisas Energéticas e Nucleares (IPEN). Secretaria de Desenvolvimento Econômico (São Paulo - Estado). São Paulo , SP, Brazil |
| Assoc. researchers: | Sabrina Gonçalves de Macedo Carvalho ; Shirley Leite dos Reis |
Abstract
An experimental detection of the luminescence occurring during electric field-assisted (flash) pressureless sintering of zirconia-based solid electrolytes will be carried out. Flash sintering consists on promoting one or more electric current pulses through a polycrystalline ceramic pellet under DC or AC electric fields during heating up (dynamic process) or at a fixed temperature (isothermal process), usually at temperatures and time lower than those used in conventional sintering. As luminescent emission has been reported to occur during the flash event, its spectrophotometric analysis may provide information regarding the physical mechanisms during flash sintering. Yttria-stabilized zirconia will be used for monitoring luminescent emission during flash sintering. Flash sintering experiments will be performed in a dilatometer with electrical connections to the sample holder. The luminescent emission will be monitored in the UV-VIS-NIR region with a spectrophotometer with an optical fiber with its sensing tip close to the sample, the structural phases by X-ray diffraction, the grain morphology by scanning electron microscopy, the electrical behavior by electrochemical impedance spectroscopy. The main goal is a detailed analysis of the luminescent spectrum to contribute to the understanding of the mechanism responsible for flash sintering. (AU)