Abstract
The influence of externally located platinum on the isothermal stability of α-Al2O3 scales formed at high temperatures has been examined. It has been observed that a nickel-base alloy forms an external scale of α-Al2O3 during oxidation at 1200°C, but this scale breaks down isothermally, enabling a faster-growing Cr2O3-rich scale to develop. However, in the presence of platinum metal alongside the specimen in the furnace hot zone, the breakdown of the α-Al2O3 scale is postponed for a substantial period of time. It appears that platinum, as the volatile species PtO2, is incorporated into the growing α-Al2O3 scale where it either influences the stress relief mechanism at temperature or reduces oxidation growth stress generation and thus significantly enhances the isothermal stability of the scale.
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References
F. A. Golightly, F. H. Stott, and G. C. Wood,Oxid. Met. 10, 163 (1976).
J. D. Kuenzly and D. L. Douglass,Oxid. Met. 8, 139 (1974).
H. Fischmeister,Mem. Sci. Rev. Metall. 62, 211 (1965).
M. G. Hobby, M.Sc. Thesis, University of Manchester (1968).
F. A. Golightly, unpublished work.
G. C. Fryburg and H. M. Petrus,J. Electrochem. Soc. 108, 496 (1961).
J. C. Chaston,Platinum Met. Rev. 19, 135 (1975).
G. Lehnert and H. W. Meinhardt,Electrodeposition Surf. Treat. 1, 189 (1972/73).
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Fountain, J.G., Golightly, F.A., Stott, F.H. et al. The influence of platinum on the maintenance of α-Al2O3 as a protective scale. Oxid Met 10, 341–345 (1976). https://doi.org/10.1007/BF00612031
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DOI: https://doi.org/10.1007/BF00612031