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]2014-05-272014-05-271999-03-01InterCeram: International Ceramic Review, v. 48, n. 2, p. 84-88, 1999.0020-5214http://hdl.handle.net/11449/65739For 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.84-88engClayFluorescenceGlass transitionOxidationProtective coatingsRefractory materialsScanning electron microscopySubstratesThermal effectsThermoanalysisX ray diffractionCarbon oxidationX ray fluorescenceCeramic coatingsArtigoAcesso restrito2-s2.0-0032635164