Abstract
Recently a new theory was proposed to explain the effect that reactive elements have on oxide adherence. Based on data obtained on Ni-Cr-Al-Y material, this theory stated that trace quantities of sulfur in the alloy degrade adherence by weakening the metal-Al2O3 bond. The work presented here extends this concept to Fe-Cr-Al alloys by examining Al2O3 adherence on foil samples with various bulk sulfur levels obtained using high-temperature vacuum anneals. Results show that long-time vacuum anneals dramatically increase the adherence of the subsequently grown aluminum oxide, concurrent with removal of sulfur from the matrix. This evidence shows that the Al2O3-metal bond is intrinsically strong without the presence of reactive elements such as Y or rare earths in the alloy. Sulfur in the alloy, and not void formation, was found responsible for oxide spalling. In addition, voids were eliminated by reducing the sulfur concentration near the oxide-metal interface.
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Sigler, D.R. The influence of sulfur on adherence of Al2O3 grown on Fe-Cr-Al alloys. Oxid Met 29, 23–43 (1988). https://doi.org/10.1007/BF00656348
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DOI: https://doi.org/10.1007/BF00656348