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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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