Abstract
An improved sol gel coating of magnesium aluminate spinel (MgAl2O4) over flaky graphite was prepared by aluminium-sec-butoxide and magnesium nitrate. The mechanism of evolution of an extended thin film of spinel was investigated by Fourier transform infrared spectroscopy, differential thermal analysis, scanning electron microscopy and energy dispersive spectral analysis. Atomic force microscope and field emission scanning electron microscope studies were conducted to differentiate between the topography and microstructural characteristics of as-received and coated graphites. X-ray photoelectron spectroscopy was performed to substantiate the elemental composition of spinel film over graphite. Oxidation resistance and water-wettability of coated graphite were examined respectively by thermogravimetry analysis and moisture requirement during installation of a carbon containing refractory castable composition. Apparent porosity, bulk density and slag corrosion resistance of those castables were better than that documented in our previous work.
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