Developing in situ nano forsterite by adding micro silica and silicon and studying the role of ferrosilicon on physical and mechanical properties of magnesium forsterite carbon
Subject Areas :
Marjan Monshi
1
(M.Sc. Student, Advanced Materials Research Center, Faculty of Materials Engineering, Najafabad branch, Islamic Azad University, Najafabad, Isfahan, Iran.)
Ahmad Monshi
2
(Professor, Advanced Materials Research Center, Faculty of Materials Engineering, Najafabad branch, Islamic Azad University, Najafabad, Isfahan, Iran)
Keywords: hot Corrosion, Magnesia Forsterite Carbon refractory brick, Micro silica, Ferrosilicon,
Abstract :
When using Magnesia-Carbon refractories in slag line (1600 C) oxidation produces porosity and corrosion. In this research, micro silica is added to produce in situ nano forsterite inside the brick and act as a binding between MgO grains. This increases Brazilian (strength resistant to crack growth) and lowers chemical potential of silica between brick-slag and decreases diffusion of slag. 3% silicon (anti-oxidant), 1-10 % micro silica and in 2nd series of samples ferrosilicon was added. XRD showed increase of forsterite formation with ferrosilicon. Physical and mechanical properties after tempering at 250 C and sintering at 1600 C were studied at this time. Strength and crack resistance improved. Modified Scherer Equation which showed crystal size, measured crystals of forsterite as 32 nm. Ratio of Slopes Method used to calculated 10, 14 and 24 % forsterite respectively at 3, 5 and 10 % micro silica addition to yhe bricks. It shows that increase in silica, increase potencial of forsterite formation.
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