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Alumina Scale Adherence to CoCrAl Alloys and Coatings

  • D. P. Whittle
  • D. H. Boone
Part of the Materials Science Research book series (MSR, volume 14)

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.

Keywords

Active Element Protective Oxide Oxide Dispersion Surface Scale High Temperature Exposure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • D. P. Whittle
    • 1
  • D. H. Boone
    • 1
  1. 1.MMRD, Lawrence Berkeley Laboratory and Department of Materials Science and Mineral EngineeringUniversity of CaliforniaBerkeleyUSA

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