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@ARTICLE{Huang:851206,
author = {Huang, T. and Bergholz, J. and Mauer, G. and Vassen, R. and
Naumenko, D. and Quadakkers, W. J.},
title = {{E}ffect of test atmosphere composition on high-temperature
oxidation behaviour of {C}o{N}i{C}r{A}l{Y} coatings produced
from conventional and {ODS} powders},
journal = {Materials at high temperatures},
volume = {35},
number = {1-3},
issn = {1878-6413},
address = {Amsterdam [u.a.]},
publisher = {Elsevier Science},
reportid = {FZJ-2018-04906},
pages = {97 - 107},
year = {2018},
abstract = {The oxidation behaviour of free-standing CoNiCrAlY coatings
produced by low-pressure plasma spraying using conventional
powder and oxide dispersion strengthened (ODS) powder
containing 2 wt. $\%$ Al-oxide dispersion was investigated.
Thermogravimetric experiments at 1100 °C in $Ar-20\%O2$ and
$Ar-4\%H2-2\%H2O$ showed lower oxidation rates of the ODS
than the conventional coating. In the latter material the
scale growth was enhanced by extensive Y-incorporation of
Y/Al-mixed oxide precipitates in the scale and apparently by
Y-segregation to oxide grain boundaries. In the ODS coating
the alumina dispersion bonded Y in the form of Y-aluminate
thereby effectively suppressing scale ‘overdoping’.
SEM/EBSD studies of all alumina scales revealed a columnar
grain structure with the lateral grain size increasing
approximately linearly with depth from the oxide/gas
interface. For both coatings the alumina scale growth was
slower in Ar–H2–H2O than in Ar–O2. The result is
believed to be related to a lower oxygen potential gradient
and to slower grain boundary diffusion in the scale forming
in H2/H2O containing gas.},
cin = {IEK-1 / IEK-2},
ddc = {620},
cid = {I:(DE-Juel1)IEK-1-20101013 / I:(DE-Juel1)IEK-2-20101013},
pnm = {113 - Methods and Concepts for Material Development
(POF3-113)},
pid = {G:(DE-HGF)POF3-113},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000435483900012},
doi = {10.1080/09603409.2017.1389422},
url = {https://juser.fz-juelich.de/record/851206},
}