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Oxide phase development upon high temperature oxidation of γ-NiCrAl alloys

✍ Scribed by T. J. Nijdam; N. M. van der Pers; W. G. Sloof

Publisher
John Wiley and Sons
Year
2006
Tongue
German
Weight
315 KB
Volume
57
Category
Article
ISSN
0947-5117

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✦ Synopsis

The amount of each oxide phase developed upon thermal oxidation of a c-Ni-27Cr-9Al (at.%) alloy at 1353 K and 1443 K and a partial oxygen pressure of 20 kPa is determined with in-situ high temperature X-ray Diffractometry (XRD). The XRD results are compared with microstructural observations from Scanning Electron Microscope (SEM) backscattered electron images, and model calculations using a coupled thermodynamic-kinetic oxidation model. It is shown that for short oxidation times, the oxide scale consists of an outer layer of NiO on top of an intermediate layer of Cr 2 O 3 and an inner zone of isolated a-Al 2 O 3 precipitates in the alloy. The amounts of Cr 2 O 3 and NiO in the oxide scale attain their maximum values when successively continuous Cr 2 O 3 and a-Al 2 O 3 layers are formed. Then a transition from very fast to slow parabolic growth kinetics occurs. During the slow parabolic growth, the total amount of non-protective oxide phases (i.e. all oxide phases excluding a-Al 2 O 3 ) in the oxide scale maintain at an approximately constant value. The formation of NiCr 2 O 4 and subsequently NiAl 2 O 4 happens as a result of solid-state reactions between the oxide phases within the oxide scale.

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