Investigation of the Properties and Microstructure of Direct Bonded Dolomite Refractory with Fe2O3 -Cr2O3 nanoparticles: A Comparative Study

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Document Type : Research Paper

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1 شرکت فرآورده های نسوز آذر

2 فرآورده های نسوز آذر

10.22034/ijissi.2024.2004464.1266

Abstract

In this research, the properties and microstructure of direct bonded dolomite refractory (having) Iron oxide (Fe2O3) and Chrome oxide (Cr2O3) nanoparticles have been investigated. For this reason 0, 0.5, 1, 1.5, 2, 2.5 and 3 wt. % of Fe2O3 and Cr2O3 nanoparticles have been added to the composition. After forming the samples as cylinders (50*50 mm2), they were fired in an electric furnace at 1650 °C for 3 hr. The measured parameters were bulk density, apparent porosity, hydration resistance and cold crushing strength. Also, microstructural investigation and phase’s analysis of the selected samples was performed by scanning electron microscopy (SEM/EDX) and X-ray diffraction (XRD) devices; respectively. Results showed that the use of Cr2O3 nanoparticles lead to formation of CaCr2O4 and MgCr2O4 phases, which improved the sintering process of the samples thorough the solid state sintering mechanism. Also, the use of Fe2O3 nanoparticles leads to creating CaO.Fe2O3 (CF) and 2CaO.Fe2O3 (C2F) phases which improved the sintering process of the specimen thorough the liquid phase sintering mechanism. Also, it showed that Cr2O3 nanoparticles additive has a greater effect on improving the properties of direct bonded dolomite specimens compared to Fe2O3 nanoparticles additive.

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International Journal of Iron & Steel Society of Iran

Articles in Press, Accepted Manuscript
Available Online from 09 March 2024

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