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@ARTICLE{Bakan:154057,
author = {Bakan, Emine and Mack, Daniel Emil and Mauer, Georg and
Vassen, Robert},
title = {{G}adolinium {Z}irconate/{YSZ} {T}hermal {B}arrier
{C}oatings: {P}lasma {S}praying, {M}icrostructure and
{T}hermal {C}ycling {B}ehavior},
journal = {Journal of the American Ceramic Society},
volume = {97},
number = {12},
issn = {0002-7820},
address = {Oxford [u.a.]},
publisher = {Wiley-Blackwell},
reportid = {FZJ-2014-03462},
pages = {4045-4051},
year = {2014},
abstract = {Processing of Gd2Zr2O7 by atmospheric plasma spraying (APS)
is challenging due to the difference in vapor pressure
between gadolinia and zirconia. Gadolinia is volatilized to
a greater extent than zirconia and the coating composition
unfavorably deviates from the initial stoichiometry. Aiming
at stoichiometric coatings, APS experiments were performed
with a TriplexPro™ plasma torch at different current
levels. Particle diagnostics proved to be an effective tool
for the detection of potential degrees of evaporation via
particle temperature measurements at these varied current
levels. Optimized spray parameters for Gd2Zr2O7 in terms of
porosity and stoichiometry were used to produce double-layer
TBCs with an underlying yttria-stabilized zirconia (7YSZ)
layer. For comparison, double layers were also deposited
with relatively high torch currents during Gd2Zr2O7
deposition, which led to a considerable amount of
evaporation and relatively low porosities. These coatings
were tested in thermal cycling rigs at 1400°C surface
temperature. Double layers manufactured with optimized
Gd2Zr2O7 spray parameters revealed very good thermal cycling
performance in comparison to standard 7YSZ coatings, whereas
the others showed early failures. Furthermore, different
failure modes were observed; coatings with long lifetime
failed due to TGO growth, while the coatings displaying
early failures spalled through crack propagation in the
upper part of the 7YSZ layer.},
cin = {IEK-1},
ddc = {660},
cid = {I:(DE-Juel1)IEK-1-20101013},
pnm = {122 - Power Plants (POF2-122) / HITEC - Helmholtz
Interdisciplinary Doctoral Training in Energy and Climate
Research (HITEC) (HITEC-20170406)},
pid = {G:(DE-HGF)POF2-122 / G:(DE-Juel1)HITEC-20170406},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000346099800049},
doi = {10.1111/jace.13204},
url = {https://juser.fz-juelich.de/record/154057},
}