Role of carbon dissolution during manganese oxidation in CO-CO2 Atmospheres |
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Authors: | L. D. Kramer G. Simkovich |
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Affiliation: | (1) Metallurgy Section, The Pennsylvania State University, University Park, Pennsylvania;(2) Present address: Large Turbine Division, Westinghouse Electric Corp., Lester, Pennsylvania |
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Abstract: | The role of carbon produced from the decomposition of CO-CO2 gas mixtures traditionally is ignored during oxidation experiments, and only the oxygen potential established by the gas mixture is generally considered. Accordingly, to overcome this problem, a model which takes into account both carbon and oxygen dissolution into a p-type scale has been developed and tested. Two distinct cases of the model were tested at 1002°C. In the first case, variable CO/CO2 ratios were used to determine the parabolic kinetics. Thus, both variable oxygen and carbon potentials were studied. In the p-type region of MnO, the developed model appeared to hold quite well. In the second case, constant CO-CO2 ratios diluted with helium were utilized to maintain a constant oxygen potential with a variable carbon activity. The developed model appeared to hold again for the p-type region of MnO. Metallographically it was noted that the MnO scale developed exhibited an outer compact region and an inner layer that was somewhat porous. |
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