Name: Victor Luiz Gripa
Type: MSc dissertation
Publication date: 20/12/2017

Namesort descending Role
Carlos Augusto Cardoso Passos Advisor *

Examining board:

Namesort descending Role
Carlos Augusto Cardoso Passos Advisor *
Jesualdo Luiz Rossi External Examiner *
Marcos Tadeu DAzeredo Orlando Internal Examiner *

Summary: Since superconducting ceramic materials are hard and brittle, it’s limited in technological applications that expose them to electrical and thermal stresses, such as a Ceramic Superconducting Current Limiter. One possible solution to this limitation is the combination of ceramic materials with the properties of metallic materials.
With this in mind, the deposition of the SmBa2Cu3O7-δ polycrystalline ceramic was made in a vat produced in 304L stainless steel. The resulting junction was thermally treated by a flash method at 1060°C. The characterization of the junction was made by X-ray diffraction and scanning electron microscopy (SEM).
In addition, a standardized and reproducible method for grain geometry analysis using ImageJ software was developed exclusively for this work. The data obtained by the method were treated statistically in order to obtain a conjecture regarding the parameters of the grains of all ceramic deposited on the basis of images of some parts of the microstructure by determination of the Probability Density Function (Gama, Weibull or normal-logarithm) more appropriate to each case.
Although the composite has not been transitioned at temperatures above 77K, a reduction in the grain size of the composite compared to the grain size of the original ceramic could be observed which improves the percolation of the superconducting current in the passage between grains.

Key words: Ceramic Superconductor, Sm-123, Stainless Steel, AISI 304L

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