Slag corrosion of alumina-magnesia-carbon refractory bricks: Experimental data and thermodynamic simulation

Alumina-magnesia-carbon (AMC) bricks are used in steelmaking ladles, where they are part of the bottom and sidewalls working linings. These refractories can be corroded by liquid slag, especially during tapping and casting. In order to contribute with information regarding the reaction mechanisms and the formed phases when they are in contact with a molten slag, the slag corrosion at high temperatures of three AMC refractories is analyzed in this paper. A crucible test was performed at 1600 °C using an industrial basic slag, and the results were compared with those obtained in testing at 1450 °C. In addition, thermodynamic simulations of the slag-refractory contact were performed using FactSage software and a model which considers the global chemical composition of each refractory. Differences in the materials wear associated with differences in composition were predicted by the simulation. Other determining factors, such as microstructure and texture of the evaluated AMC refractories, were also discussed.Fil: Muñoz, Vanesa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaFil: Camelli, Silvia. Instituto Argentino de Siderurgía; ArgentinaFil: Tomba Martinez, Analia Gladys. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentin

Slag corrosion of alumina-magnesia-carbon refractory bricks by different approaches

Laboratory static and dynamic tests are currently used to evaluate the corrosion resistance of refractory materials used in steelmaking vessel linings. Nevertheless, there are not many available studies aimed at comparing the influence of different experimental testing conditions in the corrosion process. In this study, a detailed comparison is made between a static and a dynamic slag-corrosion test of an AMC refractory material performed at 1600 °C and also between the results obtained from each test. Differences in the wear and the distribution of new solid phases in the corroded material were identified; a more controlled slag/refractory contact was attained in the static test, while oxidation and erosion resistance were determining material characteristics in the dipping test. The results obtained in a previous post-mortem study of the same type of brick were analyzed in light of those reported in this paper, thus improving our understanding of the in-service wear of AMC refractories.Fil: Calvo, Walter Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaFil: Moliné, Marcos Nahuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaFil: Camelli, Silvia. Universidad Tecnológica Nacional; ArgentinaFil: Tomba Martinez, Analia Gladys. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentin