This work aims to evaluate the utilization of different coatings to prevent the decarburization of refractory bricks MgO-C used in ladles. This oxidation causes the loss of thickness of the bricks and the reduction of its useful live. The three types of coatings A, B e C were prepared in laboratory and then were applied on MgO-C bricks. The samples were tested at temperatures of 850ºC, 950ºC and 1050ºC. It was verified that the three tested coatings only minimize the decarburization, since they vitrify and become effective at temperatures higher to the beginning of the oxidation temperature. Moreover, it was noticed that the thickness of the decarburized layer is directly proportional to the firing temperature. The coating that presented better results was C, which showed better characteristics of flowing and viscosity. Besides that, it vitrified at lower temperature comparing to coatings A and the B.
decarburization; MgO-C bricks; coatings
