Resumo

LAGORIO, Yamila  e  BENAVIDEZ, Edgardo. Corrosion resistance of MgO-C bricks: analysis of the purity and the grain size of electrofused magnesia aggregates. Tecnol. cienc. [online]. 2024, n.49, pp.68-82.  Epub 14-Fev-2024. ISSN 1666-6933.  http://dx.doi.org/10.33414/rtyc.49.68-82.2024.

Three different qualities of MgO-C refractory bricks were formulated modifying only the purity and the grain size of magnesia. The mechanisms and degree of chemical attack of the three MgO-C bricks, developed at 1600°C, by contact with a steelmaking slag were analyzed. According to the observations made throughout the corrosion profile, it is established that the mechanisms of chemical attack of the slag were: (i) infiltration of the liquid slag through the open pores, (ii) penetration of the magnesia particles by iron ions, and (iii) reaction between the liquid slag and the secondary phases located at the grain boundaries of the MgO aggregates. Corrosion resistance increased when the magnesia aggregates had a larger grain size, a lower impurity content and a higher CaO/SiO2 ratio between the grain boundaries.

Palavras-chave : ceramics; refractories; MgO-C; slags; corrosion.

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