ISSN:
1573-4889
Keywords:
turbine airfoils
;
glow discharge mass spectroscopy (GDMS)
;
cyclic oxidation
;
yttrium
;
type-I hot corrosion
;
sulfur
;
desulfurization
;
H2 annealing, cast surface
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The environmental protection of aircraft engine high-pressure turbine blades is dependent upon the formation of a thin, slow-growing, external alumina scale. The adherence of alumina (Al2O3) scales to superalloys or coatings has been shown to be improved by adding an oxygen-active element (Y) or by desulfurization. Studies will be presented that show that cast surfaces are contaminated with sulfur and are more susceptible to high-velocity oxidation than machined surfaces regardless of an oxygen-active-element addition. In addition, the positive effect of oxygen-active elements and desulfurization on the performance of a single-crystal and directionally solidified Ni-base super-alloy in a 1149°C cyclic oxidation test and a 927°C/5 ppm sea-salt Type-I hot-corrosion test will be discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01046745
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