Al2O3-C refractory samples were prepared using corundum, flake graphite, Al and Si powders and phenolic resin as raw materials. The in-situ synthesis mechanism of Al5O6N in Al2O3-C refractories was studied and the effect of adding nano metallic Fe on the formation and microstructure of Al5O6N phase was also investigated. Thermodynamic calculations show that Al5O6N can potentially be synthesized in a reducing atmosphere at 1600°C over a narrow range of N2 and CO pressures. Experimental results proved that Al5O6N phase was synthesized after 1600°C heat treatment when nano Fe was added to Al2O3-C refractories. As the content of nano Fe increases, Al5O6N particles show disappearance of oriented growth, with octahedron shapes turning into spherical agglomerations.
Al2O3-C refractories Al5O6N synthesis mechanism
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