Abstract
In many cases, alumina scales are assumed to grow predominantly by oxygen diffusion, but some authors have found that the growth can be controlled by aluminium diffusion. These mechanisms can be modified by active elements. The problem with alumina is that there is a lack of data about self-diffusion coefficients, and, due to the stoichiometry of alumina, diffusion data correspond to an extrinsic diffusion mechanism so that it is not possible to compare oxygen and aluminium diffusion coefficients. In order to obtain information about the alumina scale growth mechanism, oxygen (18O) and aluminium (26Al) self-diffusion coefficients in Al2O3 were determined in the same materials and in the same experimental conditions, thus allowing a direct comparison. For both isotopes, bulk and sub-boundary diffusion coefficients were determined in single crystals of undoped alumina. Grain-boundary diffusion coefficients have been computed only for oxygen diffusion in polycrystals. Oxygen diffusion has been also studied for yttria-doped α-alumina in the lattice, sub-boundaries and grain boundaries. Oxygen and aluminium bulk diffusion coefficients are of the same order of magnitude. In the sub-boundaries, aluminium diffusion is slightly faster than oxygen diffusion. Yttria doping induces a slight increase of the oxygen bulk diffusion, but decreases the grain-boundary diffusion coefficients on account of segregation phenomena. These results are compared with the oxidation constants of alumina former alloys (alloys which develop an alumina scale by oxidation). It appears that neither lattice self-diffusion nor grain boundary self-diffusion can explain the growth rate of alumina scales. Such a situation is compared to the case of Cr2O3.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
A. M. Huntz, in “The role of Active Elements in the Oxidation Behaviour of High-temperature Metals and Alloys”, edited by E. Lang (Elsevier Applied Science, London and New York, 1989) p. 81.
S. K. Tiku and F. A. Kröger, J.Am. Ceram Soc. 63 (1980) 31.
M. M. El-Aiat and F.A. Kröger, ibid. 65 (1982) 162.
H. A. Wang and F. A. Kröger, ibid. 63 (1980) 613.
F. A. Kröger, Solid State Ionics 12 (1984) 189.
M. Loudjani, B. Lesage, G. Petot-Ervas, D. Dewerdeir and A. M. Huntz, Adv. Ceram. 23 (1987) 125.
B. Lesage, Doctorate Thesis, University of Paris XI (1984).
D. Prot, Thesis, University of Paris VI (1991).
M. K. Loudjani, Doctorate thesis, University of Paris XI (1992).
M. H. Lagrange, A. M. Huntz and L. Y. Laval, Ann. Chim. Fr. 12 (1987) 9.
K. Kitazawa and R. L. Coble, J. Am. Ceram. Soc. 57 (1974) 250.
M. Déchamps and F. Barbier, in “Science of Ceramics Interfaces”, edited by J. Nowotny (Elsevier Science, Amsterdam, 1991) 323.
M. K. Loudjani, A. M. Huntz and R. Cortés, J. Mater. Sci. 28 (1993) 6466.
K. P. R. Reddy, J. L. Smialek and A. R. Cooper, Oxid. Met. 17 (1982) 429.
E. W. A. Young and J. H. W. De Wit, Solid State Ionics 16 (1985) 39.
Idem, Oxid. Met. 26 (1986) 351.
A. E. Paladino and W. D. Kingery, J. Chem Phys. 37 (1962) 957.
Y. Oishi and W. D. Kingery, ibid. 33 (1960) 480.
Y. Oishi, K. Ando and Y. Kubota, ibid. 73 (1980) 1410.
Y. Oishi, K. Ando, N. Suga and W. D. Kingery, J. Am. Ceram. Soc. 66 (1983) C 130.
D. J. Reed and B. J. Wuench, ibid. 63 (1980) 88.
K. P. R. Reddy and R. A. Cooper, ibid. 65 (1982) 634.
K. D. D. Lagerlof, B. J. Pletka, T. E. Mitchell and A. H. Heuer, Rad. Effects 74 (1983) 87.
J. L. Cadoz, Doctorate Thesis, Université Paris XI (1978).
M. Le Gall, B. Lesage and J. Bernardini, Phil. Mag. A (1994)
M. Le Gall, Doctorate thesis, University of Paris XI (1992).
M. Le Gall, B. Lesage, A. M. Huntz and C. Monty, Phil. Mag. A (1994)
A. D. Le Claire and A. Rabinovitch, J. Phys. C, Solid State Phys. 14 (1981) 3863.
B. Lesage, Doctorate thesis, University of Paris XI (1984).
L. Badrour, Doctorate thesis, University of Aix-Marseille III (1986).
D. Prot, M. Miloche and C. Monty, Coll. Physique C1 51 suppl. (1990) 1027.
R. R. Dils, PhD thesis, Stanford University (1965).
G. J. Dienes, D. O. Welch, C. F. Fisher, R. D. Hatcher, D. Lazareth and M. Samberg, Phys. Rev. B11 (1975) 3060.
M. K. Loudjani, A. M. Huntz, R. Cortès, J. Mater. Sci. 28 (1993) 6466.
M. K. Loudjani, Doctorate thesis, University of Paris XI (1992).
C. Wagner, Z. Phys. Chem. B. (1933) 21.
J. Nowok, Oxid. Met. 18 (1982) 1.
F. Clémendot, J. M. Gras and J. C. Van Duysen, in Proceedings of 3rd International Symposium on High Temperature Corrosion and Protection of Materials, Les Embiez, France, May 1992.
P. Choquet, C. Indrigo and R. Mevrel, Mater. Sci. Eng. 88 (1987) 97.
P. Choquet, Doctorate thesis, University of Paris XI (1987).
J. Jedlinski, G. Borchardt and S. Mrowec, Solid State Ionics 50 (1992) 67.
D. N. Chaubet, A. M. Huntz and F. Millot, J. Mater. Sci. 26 (1991) 6119.
A. C. S. Sabioni, A. M. Huntz, J. Philibert, B. Lesage and C. Monty, ibid. 27 (1992) 4782.
A. Atkinson, Mater. Sci. Technol 4 (1988) 1046.
F. Barbier and M. Déchamps, J. Physique, Coll. C5 49 suppl. 10 (1988) 575.
F. Barbier, C. Monty and M. Déchamps, Phil Mag. 58 No. 3 (1988) 475.
A. M. Huntz, G. Moulin and G. Ben Abderrazik, Ann. Chim. Fr. 11 (1986) 291.
M. W. Brumm and H. J. Grabke, Corr. Sci. 33 (1992) 1677.
A. Atkinson, Rev. Mod. Phys. 57 (1985) 437.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Le Gall, M., Huntz, A.M., Lesage, B. et al. Self-diffusion in α-Al2O3 and growth rate of alumina scales formed by oxidation: effect of Y2O3 doping. JOURNAL OF MATERIALS SCIENCE 30, 201–211 (1995). https://doi.org/10.1007/BF00352151
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00352151