Abstract
The formation and growth of protective scales limit the availability of oxygen to the substrate thereby increasing the useful life at elevated temperatures. However, in many applications, the useful life is not limited by the passage of diffusing species through a growing oxide scale but by the frequency of scale spallation. In our paper we review the data which led to the conclusion that the alumina scales which form on alloys are very adherent and that sulfur, a tramp impurity in the alloy, segregates to and weakens the bonds at the substrate—scale interface. We then discuss the role of sulfur with respect to aluminide coating formation and performance.
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