TEM and SNMS studies on the oxidation behavior of NiCrAlY-based coatings

The effect of minor Ti additions content (0% Ti, 0.4% Ti, 1% Ti, 2% Ti) on the oxidation behaviour of Ni-20Cr-10Al-0.4Y (in wt.%) model alloys was investigated in the temperature range 950-1100 deg C up to 200 h in Ar-20% O sub 2 . Alloy microstructure, oxide scale morphology and microstructure of t...

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Bibliographic Details
Published in:Fresenius' journal of analytical chemistry 1996-06, Vol.358 (1-2), p.122-126
Main Authors: Clemens, D, Vosberg, V R, Penkalla, H J, Breuer, U, Quadakkers, W J, Nickel, H
Format: Article
Language:English
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Summary:The effect of minor Ti additions content (0% Ti, 0.4% Ti, 1% Ti, 2% Ti) on the oxidation behaviour of Ni-20Cr-10Al-0.4Y (in wt.%) model alloys was investigated in the temperature range 950-1100 deg C up to 200 h in Ar-20% O sub 2 . Alloy microstructure, oxide scale morphology and microstructure of the scale were characterized by SEM/EDX and TEM. The growth mechanisms of the alumina scales formed on the model alloys were studied by two-stage oxidation experiments with exp 18 O sub 2 -tracer and subsequent SNMS-analyses. The microstructural observations were correlated with the oxide scale properties in respect to growth rates and spalling resistance, which was tested during cyclic oxidation.
ISSN:0937-0633