Oxidation behaviour of simple and Pt-modified aluminide coatings on IN738 at 1100 °C
نویسندگان
چکیده
منابع مشابه
Oxidation behaviour of simple and Pt-modified aluminide coatings on IN738 at 1100 °C
The oxidation of both low and high-activity simple and Pt-modified aluminide coatings on nickel base superalloy IN738 has been studied in static air at 1100 OC up to 1000 h. For all coatings oxidation followed a parabolic law up to 400 h. The two Pt-modified coatings showed better protectiveness with lower mass gains and smaller rate constants, especially for long reaction times. The presence o...
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Short cracks, extending to the interdiffusion zone, have been observed in platinum-modified nickel-aluminide diffusion coatings on single-crystal CMSX-4 superalloys after these have been subject to short (10 min) rapid thermal cycles. The cracks were revealed after removing the thermally grown oxide formed during cycling on the coating surfaces. Cracking was observed for coatings subject to the...
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The influence of Y 2 0 3 coatings on the oxidation behaviour of Fe-25wt%Al and Ni-32wt%Al has been investigated at 1100 and 1200 OC. Samples were sputter coated with 4 nm of Y 2 0 3 and oxidized sequentially in 1602 and Oxide scales have been characterized using SIMS, XPS, SEM, X-ray and electron diffraction. A comparison is made between the growth of oxide on Y203-coated and uncoated alloys. T...
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The evolution of the surface roughness of an initially flat platinum-modified nickel aluminide (NiPtAl) coating on a single crystal superalloy with cyclic oxidation has been measured by optical profilometry and correlated with the aluminide microstructure. The roughness evolution is dominated by the relative motion of individual grains on thermal cycling, with the larger sized grains moving up ...
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ژورنال
عنوان ژورنال: Le Journal de Physique IV
سال: 1993
ISSN: 1155-4339
DOI: 10.1051/jp4:1993954