Banca de DEFESA: LUANA BARBOSA DA CRUZ

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : LUANA BARBOSA DA CRUZ
DATA : 09/09/2017
HORA: 10:00
LOCAL: Sala de aulas do PPGCEM
TÍTULO:

Production of NiO/CDG ceramic tapes by Tape Casting

PALAVRAS-CHAVES:

Tape Casting. Nickel oxide. Cerium doped with gadolinium. Rheology. Laminates.

PÁGINAS: 83
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

Solid oxide fuel cells (SOFCs) are electrochemical devices that are increasingly used because they have high energy conversion capacity and are minimally polluting. Several materials are used in the composition of the anode, among them NiO / CDG, since they promote an increase of intragranular ionic conductivity, improving the properties of the fuel cell, besides minimizing production costs, since there is a decrease in the operating temperature of SOFCs. One of the most widespread fine-film production techniques today is Tape Casting, which has been widely used in the electronics industry in capacitors, ferromagnetic memories, ceramic circuit substrates, among other applications, thanks to the great versatility of this method. This process requires a slurry homogeneous and stable slip, which composition of the formula can be varied according to the powder used. In this work, NiO/CDG slurries were prepared in aqueous medium, with the addition of polymers responsible for stability, flexibility and resistance to the body in green. The characterization was performed from the study of the stability of the suspension through rheological analysis, which showed a pseudoplastic behavior, in which there is a decrease of the viscosity as the shear rate increases. Studies were performed to verify the apparent density and porosity of the sintered bodies, X-ray diffraction, Differential Thermal Analysis (DTA), Thermogravimetric (TGA) and mechanical resistance. The XRD results allowed to observe the phases present in the tapes produced after the sintering stages at temperatures of 1250oC, 1300oC and 1400oC. The thermal analysis tests demonstrated the stability of the samples from 450oC, the mechanical strength tests showed a good flexural strength between 80 and 90 MPa for multilayer tape and 10 MPa for single tapes, allowing to observe that there is a better performance in tapes with multilayers, as there is an increase in mechanical resistance. The tapes produced were porous, dense and resistant.

MEMBROS DA BANCA:
Externo à Instituição - ANA PAULA DA SILVA PERES - UFRN
Externo à Instituição - ANTONIO CARLOS SILVA DA COSTA - UFRN
Externo à Instituição - LUCIANNA DA GAMA FERNANDES VIEIRA - UFCG
Externo à Instituição - SHEYLA KAROLINA JUSTINO MARQUES - IFAl
Presidente - 1149564 - WILSON ACCHAR