Processamento e caracterização microestrutural da eletrocerâmica SmBa2Cu3O7-d

• Ano de defesa: 2023
• Autor(a) principal: Assis, Bruno da Silva
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Engenharia Mecânica; Centro Tecnológico; UFES; Programa de Pós-Graduação em Engenharia Mecânica
• Palavras-chave em Português: Supercondutores; Sinterização; Difração de raios X; Microscopia Eletrônica de Varredura (MEV); EDS; Reação de estado sólido; Engenharia Mecânica
• Link de acesso: http://repositorio.ufes.br/handle/10/12282

In the present work, samples of SmBa2Cu3O7-d (Sm-123) superconducting ceramics were obtained and their microstructure were characterized. The main goal of this work is to optimize the synthesis parameters of the SmBa2Cu3O7-d ceramic, in order to investigate the influence of heat treatments on the microstructure, phase formation and density of ceramics. Polycrystalline samples of SmBa2Cu3O7-d (Sm-123) were produced using different synthesis parameters, so it can be understood how the changes in heat treatment can affect the final microstructure. The samples were prepared using the solid-state reaction technique and divided into six sample groups with oxygen flow ranging from 0,2 cm³/s to 1,2 cm³/s, for 72 hours at a level of 1060 ºC, followed by cooling to a temperature of 520 ºC for 24 hours. The characterization of the samples was carried through diffraction X-ray imaging (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and density analysis using the Archimedes method. The results indicate that temperature and oxygenation directly influence the phase formation of the material, densification and control of the size of junctions. We concluded that the production process was efficient and that the optimization is necessary to obtain more expressive results regarding the superconducting characteristics of the material.