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Oxidation Behavior of Hf-Modified Aluminide Coatings on Inconel-718 at 1050°C
ISSN: 2369 - 3355
Publisher: author
Oxidation Behavior of Hf-Modified Aluminide Coatings on Inconel-718 at 1050°C
Indexed in
Technology and Engineering
ARTICLE-FACTOR
1.3
Article Basics Score: 3
Article Transparency Score: 3
Article Operation Score: 2
Article Articles Score: 3
Article Accessibility Score: 3
SUBMIT PAPER ASK QUESTION
International Category Code (ICC):
ICC-1802
Publisher: Lifescience Global Inc.
International Journal Address (IAA):
IAA.ZONE/2369108523355
eISSN
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2369 - 3355
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Abstract
Simple beta-NiAl, Hf-modified beta-NiAl, Pt-diffused, Pt-modified beta-(Ni,Pt)Al + eta-PtAl2, and Hf-Pt-modified beta-(Ni,Pt)Al were cyclic oxidation tested at 1050°C in air on Inconel-718 substrates for up to 4370h. The Pt-diffused specimen failed most quickly,< 100 h, while the simple beta-NiAl aluminide maintained a positive weight change for ~1300 h. The Pt-modified aluminides clearly improved the cyclic oxidation behavior of both simple and Hf-modified aluminides, sustaining a zero weight change only after 3600 and 4000 h, respectively. The Hf additions did not immediately appear to produce as strong an improvement as expected, however, they were more highly ranked when normalized by coating thickness. They also decreased surface rumpling, important for TBC durability. Hf-rich NiAl grain boundaries, formed during coating processing, resulted in HfO2 particles in the scales and oxide pegs at the metal interface, all suggesting som...
