Ceramic coating for refractories protection against carbon oxidation, Part 1: Protection mechanisms
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Data
1999-03-01
Autores
Garcia Dos Santos, I.
Cruz, F.
Paskocimas, C. A.
Nascimento Silva, S.
Marques, O. R.
Leite, E. R.
Longo, Elson [UNESP]
Varela, José Arana [UNESP]
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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
Como citar
InterCeram: International Ceramic Review, v. 48, n. 2, p. 84-88, 1999.