Abstract
A β-NiAl coating with or without a Re-base alloy layer was formed on a Nb–5Mo–15W alloy. The coated alloys were oxidized isothermally in air at 1373 and 1473 K. Electroplating of a high (more than 70at.%)-Re–Ni film, Cr-pack cementation, Ni plating, and then Al-pack cementation, in this sequence, formed a coating structure with Re-base alloy and β-NiAl layers. The Re-base alloy layers were comprised of an outer σ-phase in the Re–Cr(Ni) system and an inner χ-phase in the Re–Nb(Cr) system. It was found that reaction between the β-NiAl and the alloy substrate was significantly suppressed when the Re-base alloy layers were present. The Re-base σ and χ phases were found to be good candidates for a diffusion barrier against inward-Al diffusion because they have very low solubilities for Al.
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Matsumura, Y., Fukumoto, M., Hayashi, S. et al. Oxidation Behavior of a Re-Base Diffusion-Barrier/β-NiAl Coating on Nb–5Mo–15W at High Temperatures. Oxidation of Metals 61, 105–124 (2004). https://doi.org/10.1023/B:OXID.0000016279.88052.d9
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DOI: https://doi.org/10.1023/B:OXID.0000016279.88052.d9