Abstract:Oxygen permeability through alumina wafers was evaluated at high temperatures up to 1923 K to elucidate the mass-transfer mechanisms of polycrystalline alumina and serve as a model for protective alumina film formed on heat-resistant alloys. Oxygen permeation proceeded via grain boundary (GB) diffusion of oxygen from the higher oxygen partial pressure (P O2 ) surface side to the lower P O2 surface side, along with the simultaneous GB diffusion of aluminum in the opposite direction to maintain the Gibbs-Duhem r… Show more
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