Improved Corrosion Resistance of Alumina-Spinel Castable by Colloidal Alumina Addition

E.Y. Sako1, V.C. Pandolfelli1, E. Zinngrebe2, M.A.L. Braulio3, S. van der Laan4

1 Federal University of São Carlos, Materials Microstructural Engineering, Group (FIRE Associate Laboratory), 13565-905 São Carlos/Brazil
2 Tata Steel Europe RD&T, Ceramics Research Centre, 1970–1976 IJmuiden/The Netherlands
3 Federal University of São Carlos, Materials Microstructural Engineering, Group (FIRE Associate Laboratory), 13565-905 São Carlos/Brazil
4 Tata Steel Europe RD&T, Ceramics Research Centre, 1970–1976 IJmuiden/The Netherlands

Revision 04.07.2011, 09.09.2011

Volume 4, Issue 2, Pages 117 - 120

Abstract

Alumina-spinel castables are usually applied as a refractory lining of steel ladles in regions where both volumetric stability and corrosion resistance are required. However, the addition of the traditional calcium aluminate cement as a binder agent in those refractories leads to residual expansion and reduces the basic slag resistance, mainly due to the CA6 (CaO·6Al2O3) formation. In this work, a novel approach was designed in order to improve the performance of these materials, by using alumina-based binder agents: hydratable alumina and colloidal alumina. The results highlighted a reduced corroded area after the slag tests for the latter, which was most likely associated with the decrease in the average pore size. Therefore, the use of these nano-scaled alumina particles points out a promising technique to produce alumina-spinel castables for key regions in the steel ladle.

Keywords

colloidal alumina, aluminaspinel, castables, corrosion resistance

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