Effect of Oxygen Potential Gradient on Mass Transfer in Polycrystalline α-Alumina at High Temperature

Satoshi Kitaoka; Tsuneaki Matsudaira; Tsubasa Nakagawa; Naoya Shibata; Yuichi Ikuhara

doi:10.4028/www.scientific.net/MSF.879.966

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HomeMaterials Science ForumMaterials Science Forum Vol. 879Effect of Oxygen Potential Gradient on Mass...

Effect of Oxygen Potential Gradient on Mass Transfer in Polycrystalline α-Alumina at High Temperature

Abstract:

The oxygen permeability of polycrystalline α-alumina wafers, which served as model alumina scales formed on heat-resistant alloys, was evaluated at a temperature of 1873 K. Mass transfer along grain boundaries (GBs) in an alumina wafer exposed to a large oxygen potential gradient (dμ_O), where both oxygen and aluminum mutually diffuse along GBs, was analyzed using ¹⁸O₂ and SIMS. ¹⁸O was concentrated at GB ridges on the high oxygen partial pressure (P_O2(hi)) surface and along the GBs near the P_O2(hi) surface. ¹⁸O adsorbed on the surface diffused almost immediately to surface GBs, resulting in the formation of new alumina by reaction with aluminum diffusing outward along the GBs. Oxygen GB diffusion coefficients in the vicinity of the P_O2(hi) surface were determined from the ¹⁸O depth profile along each GB for the ¹⁸O map of the cross section of the exposed alumina wafer. The oxygen GB diffusion coefficients were comparable to the values calculated from the oxygen permeability constants assuming an electronic conductivity and were obviously lower than those of oxygen GB self-diffusion without an oxygen potential gradient.

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Materials Science Forum (Volume 879)

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966-971

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.879.966

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Online since:

November 2016

Authors:

Satoshi Kitaoka*, Tsuneaki Matsudaira, Tsubasa Nakagawa, Naoya Shibata, Yuichi Ikuhara

Keywords:

Alumina, Diffusion, Grain Boundary, High Temperature, Oxygen Permeation, Oxygen Potential Gradient, Scale

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References

[1] A. G. Evans, D. R. Mumm, J. W. Hutchinson, G. H. Meier, F. S. Pettit, Prog. Mater. Sci. 46 (2001) 505-553.

Google Scholar

[2] S. Kitaoka, T. Matsudaira, M. Wada, Mater. Trans. 50 (2009) 1023-1031.

Google Scholar

[3] T. Matsudaira, M. Wada, T. Saitoh, S. Kitaoka, Acta Mater. 58 (2010) 1544-1553.

Google Scholar

[4] T. Matsudaira, M. Wada, T. Saitoh, S. Kitaoka, Acta Mater. 59 (2011) 5440-5450.

Google Scholar

[5] M. Wada, T. Matsudaira, S. Kitaoka, J. Ceram. Soc. Jpn. 119 (2011) 832-839.

Google Scholar

[6] T. Matsudaira, M. Wada, T. Saitoh, S. Kitaoka, J. Am. Ceram. Soc. 96 (2013) 3243–3251.

Google Scholar

[7] S. Kitaoka, T. Matsudaira, M. Wada, T. Saitoh, M. Tanaka, Y. Kagawa, J. Am. Ceram. Soc. 96 (2014) 2314-2322.

Google Scholar

[8] J. Balmain, A. M. Huntz, Oxidation of Metals, 45 (1996) 183-196.

Google Scholar

[9] S. Chevalier, B. Lesage, C. Legros, G. Borchardt, G. Strehl, M. Kilo, Defect and Diffusion Forum, 237-240 (2005) 899-910.

DOI: 10.4028/www.scientific.net/ddf.237-240.899

Google Scholar

[10] A.H. Heuer, T. Nakagawa, M.Z. Azar, D.B. Hovis, J.L. Smialek, B. Gleeson, N.D.M. Hine, H. Guhl, H. -S. Lee, P. Tangney, W.M.C. Foulkes, M.W. Finnis, Acta Mater. 61 (2013) 6670-6683.

DOI: 10.1016/j.actamat.2013.07.024

Google Scholar

[11] A.D. Le Claire, Brit. J. Appl. Phys. 14 (1963) 351-356.

Google Scholar

[12] T. Nakagawa, I. Sakaguchi, N. Shibata, K. Matsunaga, T. Mizoguchi, T. Yamamoto, H. Haneda, Y. Ikuhara, Acta Mater. 55 (2007) 6627-6633.

DOI: 10.1016/j.actamat.2007.08.016

Google Scholar