Oxidation Rate of Magnesia-Carbon Refractory with Aluminum Additive

Hiroyuki Sunayama; Masayasu Kawahara

doi:10.4028/www.scientific.net/MSF.522-523.603

Paper Titles

An Overview of Metal Dusting in Synthesis Gas Environments
p.571

The Role of Copper in Resisting Metal Dusting of Ni-Base Alloys
p.581

Numerical Analysis and Control of Gas Carburizing under Changes in Gas Compositions
p.589

Microstructures of SiO₂ Scales Formed on MoSi₂
p.595

Oxidation Rate of Magnesia-Carbon Refractory with Aluminum Additive
p.603

TEM Observation of the Initial Stage Oxidation of TiAl Based Alloys in a Simulated Combustion Atmosphere
p.609

Influence of the Third Element on the High Temperature Oxidation Behavior of γ'-Ni₃Al Alloys
p.617

Influence of Additional Elements on the Oxidation Behaviour of Nb-Al-Cr Base Alloys
p.625

Influence of Ion Implantation of Several Elements on Oxidation Behavior of TiAl
p.633

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Oxidation Rate of Magnesia-Carbon Refractory with Aluminum Additive

Abstract:

An effect of addition of 2 mass % aluminum powder on the oxidation rate of magnesia-carbon refractory, MgO-C, containing 5 mass % carbon has been investigated by measuring weight change with a thermobalance for the cubic specimens in the temperature range from 1073 to 1823 K in air. The oxidation rate of carbon was measured by analyzing the residual carbon in the specimens at some oxidation time. The variations of the weight with oxidation time at temperatures from 1273 to 1673 K showed the similar tendency. The oxidation rate of carbon in the MgO-C refractory with 2 mass % of aluminum additive was a little smaller than that of the MgO-C refractory with no additives. When the oxidation temperature increased to 1823 K, the weight change became very small. It was suggested that the gaps between MgO grains in the thin oxidation layer were bridged by MgO·Al2O3, which was identified by a X-ray diffraction method.