The Effect of Carbon Nanoparticles and Calcined Alumina on Mechanical Properties and Corrosion Resistance Behavior of the Magnesia Carbon Refractories

Nowadays, magnesia carbon refractories are very important for the iron and steel industries. It is due to their unique properties, such as low wet ability with melt iron and steel. Therefore, it is important to extend the life of the refractory. In this research, the effect of calcined alumina and nano carbon on mechanical strength and corrosion resistance against slag in magnesia carbon refractories was studied. Mechanical strength of cold crushing strength, CCS, was measured. The bulk density, BD, and apparent porosity, AP, were determined, relative to the size and weight measured, using Archimedes method standard and corrosion resistance against the slag shrub procedure. Cylindrical ۵۰×۵۰ mm samples were tempered at ۲۵۰ oC for ۳ h. The corrosion resistance of the samples cocked at ۱۳۵۰ oC for ۲ h under reducing atmosphere (coke bed) was evaluated. XRD and SEM-EDS analyses were used for characterizations. The results showed that the combination of calcined alumina, magnesia, graphite and nano carbon produced very high strength up to ۵۰% and density up to ۱۲.۵%, as well as very good corrosion resistance. Especially, the samples containing alumina showed better corrosion resistance, as compared with other samples, due to spinel phase.