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Effect of carbon content on the oxidation resistance and kinetics of MgO-C refractory with the addition of Al powder |
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| Affiliation: | 1. Federal University of São Carlos, Materials Engineering Department, Rodovia Washington Luiz, Km 235, São Carlos, SP, 13565-905 Brazil;2. Magnesita Refratários S.A., Research and Development Center, Praça Louis Ensch, 240, Contagem, MG, 32210-900 Brazil;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084 China;2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081 China;1. The Key State Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, PR China;2. Institute of Ceramic, Glass and Construction Materials, TU Bergakademie Freiberg, Agricolastrasse 17, 09599 Freiberg, Germany;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, 430081 Wuhan, PR China;2. Chair of Ceramics, University of Leoben, Peter-Tunner-Straße 5, 8700 Leoben, Austria |
| Abstract: | The effect of carbon content of MgO-C refractory was studied with respect to the physical properties, oxidation resistance and kinetics. The oxidation mechanism was investigated by calculating the relevant parameters of oxidation and analyzing the evolutions of phases and microstructures. The oxidation resistance of MgO-C refractory was influenced by the indirect oxidation of carbon through the formation of the MgO constituent layer. The effect of indirect oxidation resulted in the MgO-C refractory with 3 wt% carbon content having a lower oxidation rate and weight loss rate when fired at 1600 °C than when fired at 1400 °C. The oxidation kinetics results based on shrinking core model showed that the effective diffusion coefficient and full oxidation time increased with the increasing of carbon content. This seemingly paradoxical result was mainly due to the effect of the molar density of carbon prevailing over that of the effective diffusion coefficient in the oxidation process. |
| Keywords: | MgO-C refractory Indirect oxidation Oxidation resistance Oxidation kinetics |
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