resumo
Ultrafast high-temperature sintering (UHS) is a rapidly growing research area of material science and engineering. Herein we present UHS of gadolinia-doped ceria (GDC) powders in single and multi-step approaches. The sintered ceramics were characterized from a physical and electrochemical point of view. When the power is applied gradually during the multistep UHS process crack-free GDC ceramics can be obtained with 95 % bulk density using commercial powder. Oxalate converted GDC powder gave 86 % bulk density with the same multistep sintering process. Additionally, it is shown that multistep UHS is also suitable for multilayer cosintering necessary for solid oxide fuel cells (SOFC), as demonstrated by the production of dense GDC electrolyte in tight contact with porous electrodes.
palavras-chave
ELECTRICAL-CONDUCTIVITY; FLASH; CERAMICS; GD
categoria
Materials Science
autores
Alemayehu, A; Biesuz, M; Javan, KY; Tkach, A; Vilarinho, PM; Sglavo, VM; Tyrpekl, V
nossos autores
Oleksandr Tkach
Investigador Auxiliar
Paula Maria Lousada Silveirinha Vilarinho
Vice-DiretorProjectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This study was funded by the Czech Science Foundation (GACR) , under Project 20-20936Y " Microstructural and chemical effects during flash sintering of refractory oxides" . This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by national funds through the FCT/MEC (PIDDAC) . A.T. acknowledges as well FCT for financial support (2021.02284.CEECIND) and Rui Pinho for assistance with impedance measurements.