Abstract
An electrochemical method based on plotting theV-I curves of an oxide scale was used to study the variation of transport properties across the α-alumina scale formed on Β-NiAl at 1100‡C after 4 days of oxidation. The theoretical approach ofV-I curves has been developed in part I. Analysis and comparison of theV-I curves obtained for differentP O2 imposed on alumina allowed us to propose a variation of ionic and electronic conductivities versusP O2 inside the scale. Electronic and ionic conductivity variations so obtained are discussed. A volume conduction model of nickel-doped alumina is proposed for electronic conductivity. Diffusion of charged species along grain boundaries of α-alumina is suggested to be the main contribution to the ionic conductivity, and also to the transport during Β-NiAl oxidation at 1100‡C.
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Nicolas-Chaubet, D., Huntz, A.M. & Millot, F. Electrochemical method for the investigation of transport properties of alumina scales formed by oxidation. J Mater Sci 26, 6119–6126 (1991). https://doi.org/10.1007/BF01113893
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DOI: https://doi.org/10.1007/BF01113893