Effect of Antioxidants and Atmosphere on the Phase Formation and Microstructure of In Situ MgO-Al2O3 Spinels

Rahim Naghizadeh; Hamid Reza Rezaie; F. Golestani Fard

doi:10.4028/www.scientific.net/DDF.273-276.542

Paper Titles

Kinetics Parameters of Atomic Migration and Diffuse Scattering of Radiations within the F.C.C.-Ni–Al Alloys
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Atomic-Ordering Kinetics and Diffusivities in Ni–Fe Permalloy
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Al-Li Surface Alloying in the Electrolytic Method
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Investigation of Homogenization Treatment in Al- Li- Cu- Zr Alloys
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Effect of Antioxidants and Atmosphere on the Phase Formation and Microstructure of In Situ MgO-Al₂O₃ Spinels
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Formation and Decomposition of Sol-Gel Synthesized Aluminum Titanate Nano Powders at the Presence of Fe₂O₃ Additive
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Effect of Colloidal Silica and Nano Boehmite Mixture on Reaction Sintering, Microstructure and Physical Properties of Tialite
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Nonclassical Properties of Molecular Diffusion in Liquids and Dense Gases
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Nanoparticle Friction Force and Effective Viscosity of Nanosuspensions
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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 273-276Effect of Antioxidants and Atmosphere on the Phase...

Effect of Antioxidants and Atmosphere on the Phase Formation and Microstructure of In Situ MgO-Al₂O₃ Spinels

Abstract:

The formation of in-situ spinel in Al2O3-MgO-C refractories along with different antioxidants occurs at different atmospheres in surface and inner of refractories. Then the types and microstructures of established phases have become increasingly important in these refractories. In the present work, reactions on firing Al2O3-MgO samples with added graphite, Al, Si and SiC in air or coke bed atmosphere at 1300°C and 1600°C have been studied. The results showed that with the addition of graphite and Al especially at 1600°C in coke bed, high alumina-rich spinel (Mg0.866Al1.83O3.611) was increased and in the microstructure were appeared high amount porosity. In silicon and silicon carbide additive samples after firing at 1600°C in coke bed, sapphirine phase were revealed.