Name: Patricio Santana de Oliveira
Type: MSc dissertation
Publication date: 24/11/2017
Advisor:

Namesort descending Role
Carlos Augusto Cardoso Passos Co-advisor *
Marcos Tadeu DAzeredo Orlando Advisor *

Examining board:

Namesort descending Role
Carlos Augusto Cardoso Passos Co advisor *
Jesualdo Luiz Rossi External Examiner *
José Luis Passamai Junior External Examiner *
Marcos Tadeu DAzeredo Orlando Advisor *
Rogério Ramos Internal Examiner *

Summary: Superconducting ceramic materials are generally hard and brittle, have
low tensile and impact strength and low heat diffusion capacity. This imposes
limitations for technological applications when superconducting ceramics are
subjected to electrical and thermal stresses. Thus, an alternative is to combine
the properties of superconducting ceramics with the properties of metals. With
this objective in mind, in this dissertation the deposition of superconducting ceramic YBa2Cu3O7-δ in stainless steel AISI 304 L followed by thermal
treatment was investigated. The thermal diffusivity measurements were
performed with a carbon dioxide laser with Gaussian space profile, wavelength 10 μ ! , intensity 10√2 # / ! 2 and diameter equal to 1 !! . In order to make
comparisons, the thermal diffusivity measurement in AISI 304 L stainless steel
plate, as received, presented value similar to the value supplied by the
manufacturer.
Using plates of AISI 304 L, several substrates with dimensions of 70mm
x 10mm x 3mm were manufactured. Posteriorly, these substrates were milled,
producing rectangular channels of 2 mm wide by 1.25 mm deep. The channels
were filled with YBaCuO electroceramics. This assembly was baked for 15 min
at a temperature of 1040 ° C, being removed and cooled in the air, generating
samples of the junction. These junction samples were characterized by XRD,
AC magnetic susceptibility and scanning electron microscopy. Finally, the
thermal diffusivity measurements were performed by the flash method at the
junction. The thermal diffusivity of the metal / ceramic junction presented values
close to those theoretically estimated, considering the hypothesis of additivity
without interference between the compounds. However, these conclusions are
partial, which reinforces the need for further studies on the thermal diffusivity of
this Metal / Ceramic junction.

Key words: Thermal diffusivity, AISI 304 L stainless steel, Laser Flash.

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