Análise de difusividade térmica na junção metal/cerâmica UNS 32304/sílico-aluminosa 45-50

• Autor(a) principal: Caliari, Hendricky Fassarella
• Data de Publicação: 2018
• 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/10/10716
• topic: Thermal diffusivity; Duplex UNS 32304 stainless steel; Fireclay bricks; Tijolo silico aluminoso; Método Flash Laser; Engenharia Mecânica; Difusividade termica; Aço inoxidável; 621

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 10μ, intensity 10√2/2 and diameter equal to 2.Using UNS 32304 steel plates, several substrates with dimensions of 70x7x1,807were manufactured. Subsequently, these substrates were milled, producing rectangular channels with 2wide by 1deep. Silica-aluminous ceramics were cut with 70x2x3and 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