TEM and SNMS studies of protective alumina scales on NiCrAlY-alloys.
The effect of Si addition on the oxidation behaviour of NiCrAlY alloys in the temperature range 950 bis 1100 degrees C has been investigated. During isothermal oxidation oxide growth rates were practically independent of the Si-content. However during cyclic oxidation Si additions were beneficial. Si additions of 1-2(m)/(0) appeared to shift the onset for spallation to longer times. It was found that Si stabilizes the beta-phase and probably it suppresses the formation of metastable Al(2)O(3) modifications.
Clemens
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Institute for Materials in Energy Systems, IWE I: Microstructure and Properties of Materials, Forschungszentrum Jülich GmbH, (KFA), D-52425, Jülich, Germany.
Vosberg
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Hobbs
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Breuer
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U
Quadakkers
W J
WJ
Nickel
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