Abstract
There are two essential requirements for alloys or coatings which are designed to withstand degradation by oxidation during high temperature exposure. First, they must form a surface oxide which thickens only at a slow rate, and secondly this oxide layer must remain adherent to the alloy surface under all conditions. A12O3 is generally regarded as the best protective oxide: diffusion through A12O3 is relatively slow in comparison with most other oxides, and since it is also stable, relatively little difficulty exists in selecting a composition which contains sufficient aluminium to provide, by selective oxidation, a protective A12O3 scale under various service environments. Typically, these will contain at least 5% A1 (by mass) and usually substantial amounts of Cr.
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© 1981 Plenum Press, New York
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Whittle, D.P., Boone, D.H. (1981). Alumina Scale Adherence to CoCrAl Alloys and Coatings. In: Pask, J., Evans, A. (eds) Surfaces and Interfaces in Ceramic and Ceramic — Metal Systems. Materials Science Research, vol 14. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-3947-2_43
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DOI: https://doi.org/10.1007/978-1-4684-3947-2_43
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