Banca de QUALIFICAÇÃO: LUANA BARBOSA DA CRUZ

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : LUANA BARBOSA DA CRUZ
DATA : 11/06/2017
HORA: 14:00
LOCAL: Sala de reuniões do DEMat
TÍTULO:

Production of NiO / CDG ceramic tapes via Tape Casting for application in fuel

PALAVRAS-CHAVES:

Bonding tapes. Nickel oxide. Cerium doped with gadolinium. Fine films. Laminates.

PÁGINAS: 75
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

Solid oxide fuel cells have been increasingly used as they have high energy conversion capacity and are minimally polluting. 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 ceramic substrates, among other applications, thanks to the great versatility of this method. This process requires a homogeneous and stable slip, which composition of the formula can be varied according to the powder used. In this work, nickel oxide (NiO), gadolinium-doped cerium (CDG) nitrile slides were prepared in aqueous medium, with the addition of polymers responsible for the stability, flexibility and resistance of the body to green (dispersant, binder, surfactant and antifoam). Arquimedes method was used to verify the density and porosity of the sintered body, X-Ray Diffraction, Differential Thermal Analysis (ATD) and Thermogravimetric (ATG) and mechanical strength. The study of the rheological properties was carried out in order to analyze the viscosity behavior of the compositions of the studied suspensions, which were characterized as pseudoplastic, in which there is a decrease as the shear rate increases. The XRD results allowed to observe the phases present in the strips produced after the sintering stages at temperatures of 1250oC, 1300oC, 1350oC and 1400oC. The thermal analysis tests demonstrated the stability of the samples from 550oC, the mechanical strength tests showed a good flexural strength between 80 and 90 MPa for multilayer tape and 10MPa for single tapes, allowing to observe that there is a better performance in tapes With multilayers, as it increases the mechanical resistance. The tapes produced were slightly 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
Presidente - 1149564 - WILSON ACCHAR