Abstract
The thiospinel (Cr, Al)3S4 has been identified in the internal sulfidation zone of Al-diffusion coatings by electron diffraction in a transmission electron microscope. The Al/Cr ratio of this phase can vary over a rather broad range, obviously dependent on the Al/Cr ratio in the surrounding metallic matrix. The spinel can dissolve significant amounts of Ni and Mo, some Co but only traces of Ti. Increasing Al-content extents its stability to higher temperatures.
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References
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Erdös, E., Rahmel, A. Identification of the spinel (Cr, Al)3S4 in the internal sulfidation zone of Al-diffusion coatings. Oxid Met 26, 101–103 (1986). https://doi.org/10.1007/BF00664275
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DOI: https://doi.org/10.1007/BF00664275