Cyclic Oxidation Performance of Si-Aluminide/MCrAlY Coating on Ni-Base GTD-111 Superalloy

Abstract:

A slurry aluminising process was utilised to produce duplex Si-modified aluminide MCrAlY coatings for superalloy GTD-111. MCrAlY coating was applied by means of high velocity oxy-fuel (HVOF) metal spray technique. Cyclic oxidation behaviour of the aluminide/MCrAlY coating were compared with plain MCrAlY coating. Oxidation performance of the coated samples was investigated by exposing samples to 1 h cyclic oxidation at 1100 ^°C. Oxidation test results demonstrate the Si-aluminide/MCrAlY coating exhibited much better oxidation resistance than the the uncoated superalloy due to the superior oxidation resistance of the alumina-silica scale at 1100 ^°C.

• Periodical: Materials Science Forum (Volume 889)
• Pages: 159-164
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.889.159
• Online since: March 2017
• Authors: K. Shirvani*, S.V. Miraboutalebi
• Keywords: MCrAlY, Aluminide Coatings, Oxidation, Silicon, Superalloy

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