Improving Corrosion Behaviour of Magnesia-chrome Refractories by Addition of Nanoparticles
School of Metallurgy and Materials Engineering, Iran University of Science and Technology, 16845-161 Tehran/Iran
Revision 17.10.2013, 24.01.2014
Volume 6, Issue 2, Pages 93 - 98
Abstract
This article reports the results of a study on mag-chrome refractories including nanoparticles of Cr2O3, Fe2O3, TiO2 and boehmite. Nanoparticles were introduced into refractory body through primary batch and via slurry impregnation into fired body. The penetration of fayalitic slag was studied by cup test. The microstructural observation was carried out by SEM. It was found that nano-Cr2O3 and nano-Fe2O3 both improved corrosion resistance by strengthening the matrix to aggregate bonding. The impregnated nano-species improved the penetration resistance by increasing the viscosity of slag locally in the penetration frontier. It seems the small nano-species are dissolved in attacking slag and change the viscosity. The penetration indexes are correlated to microstructural observations.
Keywords
magnesia chromite, corrosion, nanoparticles, vacuum impregnation
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