Publicação:
Ceramic coating for refractories protection against carbon oxidation, Part 1: Protection mechanisms

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Data

1999-03-01

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Resumo

For retarding carbon oxidation in refractories during the preheating of metallurgical furnaces, a ceramic coating, made mainly of sodium phosphosilicate and clay was developed. The coating presents high adherence to the substrate with no swelling. The coating was characterized by thermal analysis, X-ray diffraction at room temperature (XRD) and at high temperature (HTXRD), X-ray fluorescence and scanning electronic microscopy (SEM). The glass transition temperature is reached at 800 °C and only glassy phase is observed above this temperature. Thus the mechanism of protection seems to be the formation of a glassy phase on the surface of the refractory, and the coating tends to be more efficient at temperatures higher than 800 °C.

Descrição

Palavras-chave

Clay, Fluorescence, Glass transition, Oxidation, Protective coatings, Refractory materials, Scanning electron microscopy, Substrates, Thermal effects, Thermoanalysis, X ray diffraction, Carbon oxidation, X ray fluorescence, Ceramic coatings

Idioma

Inglês

Como citar

InterCeram: International Ceramic Review, v. 48, n. 2, p. 84-88, 1999.

URI

http://hdl.handle.net/11449/65739

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Araraquara - IQAR - Instituto de Química

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