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Erschienen in:
1981 | OriginalPaper | Buchkapitel
Alumina Scale Adherence to CoCrAl Alloys and Coatings
verfasst von : D. P. Whittle, D. H. Boone
Erschienen in: Surfaces and Interfaces in Ceramic and Ceramic — Metal Systems
Verlag: Springer US
Enthalten in: Professional Book Archive
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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.