Produção de filme espesso supercondutor SmBa2Cu3O7-t usando plasma spray.

• Autor(a) principal: Piumbini, Cleiton Kenup
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
• Texto Completo: http://repositorio.ufes.br/handle/10/4758
• topic: Superconductors; Thick films; Supercondutores; Filmes espessos; Física; Supercondutores; Filmes espessos; 53

Since the discovery of the critical high-temperature superconductorsin 1986, by Muller and Bednorz, the utilization of these materials, by practical ways, it is being a challengeto the researchers of the area. One of the attempts of practical application of these superconductors is to productthick and sharp layers to the transmitionof electric current. In the literature is possible to find countlessworks using the YBCO as precursors. The idea of change the yttrium by the samarium it was due his greater capacity to carry current. In this work will be presented results obtained from the productionof thick layers produced starting from the SmBa2Cu3O7-precursor. After to produce and characterize the superconductor sample of SmBa2Cu3O7-, it was ground and sieved to be sprayed. To produce the layers it was used a plasma torch of non-transferred arch, with dc current and nitrogen as workinggas dedicated to the spray deposition process. To the deposition process, the stainless steel substrates was jetted with sand, mounted in a support with internal heaters e later heated by the plasma jetuntil the temperature of 900ºC. Soon after, the deposition was made. The layers characterization was made by x-ray diffraction analysis, scanning electron microscope and electric resistivity. It was observed that the influence of the distancebetween the torch and the substrate is fundamental for the obtainingof good quality layers. The closest layers to the torch shown a little adherence to the substrate or was decompounded by the excessive heat. The farther layers shown the superconductor phase, after de oxygenation they keep added to the substrate. It was possible to observe with SEM images that happens chemical connectionsbetween the splats,thesefactis essential to the eletric current establishment. In general it was possible produce tick layer superconductorof SmBa2Cu3O7-by plasmaspray technique.