Name: Hendricky Fassarella Caliari
Type: MSc dissertation
Publication date: 07/05/2018

Namesort descending Role
Marcos Tadeu DAzeredo Orlando Advisor *

Examining board:

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Carlos Augusto Cardoso Passos Internal Examiner *
Jacyra Ramos Soares External Examiner *
Marcos Tadeu DAzeredo Orlando Advisor *

Summary: Fireclay bricks are widely used in industries WHERE exist high temperature gradient from the working face to the cold face of the material. In the steel industry, for example, they are assembled in: blast furnaces runners, torpedo car, pig iron ladle, steel ladle, LD converter, etc. As ceramics, these materials are generally hard and brittle, have low tensile strength and impact resistance. This imposes limitations for applications when they are under mechanical stresses. In this way, an alternative is to combine the properties of the ceramic with the properties of the metals. With this objective in mind, in this dissertation, the joint of fireclay brick 45-50 in duplex stainless steel UNS 32304 was investigated. The thermal diffusivity measurements were performed with a carbon dioxide laser with Gaussian space profile, wavelength 10 μ𝑚, intensity 10√2𝑊/𝑚2 and diameter equal to 1 𝑚𝑚. Using UNS 32304 steel plates, several substrates with dimensions of 70x7x1,807 𝑚𝑚 were manufactured. Subsequently, these substrates were milled, producing rectangular channels with 2 mm wide by 1 mm deep. Silica-aluminous ceramics were cut with 70x2x3 𝑚𝑚 and coupled in these generated channels. Thermal diffusivity was measured with the flash laser method. The measurement results about thermal diffusivity in the metal / ceramic junction were close to those theoretically estimated, considering the hypothesis of additivity without interference between the compounds.

Key words: thermal diffusivity, duplex UNS 32304 stainless steel, fireclay bricks, laser flash.

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