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@ARTICLE{Mahade:826086,
author = {Mahade, Satyapal and Curry, Nicholas and Björklund, Stefan
and Markocsan, Nicolaie and Nylén, Per and Vassen, Robert},
title = {{E}rosion {P}erformance of {G}adolinium {Z}irconate-{B}ased
{T}hermal {B}arrier {C}oatings {P}rocessed by {S}uspension
{P}lasma {S}pray},
journal = {Journal of thermal spray technology},
volume = {26},
number = {1-2},
issn = {1544-1016},
address = {Boston, Mass.},
publisher = {Springer},
reportid = {FZJ-2017-00346},
pages = {108 - 115},
year = {2017},
abstract = {7-8 $wt.\%$ Yttria-stabilized zirconia (YSZ) is the
standard thermal barrier coating (TBC) material used by the
gas turbines industry due to its excellent thermal and
thermo-mechanical properties up to 1200 °C. The need for
improvement in gas turbine efficiency has led to an increase
in the turbine inlet gas temperature. However, above 1200
°C, YSZ has issues such as poor sintering resistance, poor
phase stability and susceptibility to calcium magnesium
alumino silicates (CMAS) degradation. Gadolinium zirconate
(GZ) is considered as one of the promising top coat
candidates for TBC applications at high temperatures (>1200
°C) due to its low thermal conductivity, good sintering
resistance and CMAS attack resistance. Single-layer 8YSZ,
double-layer GZ/YSZ and triple-layer GZdense/GZ/YSZ TBCs
were deposited by suspension plasma spray (SPS) process.
Microstructural analysis was carried out by scanning
electron microscopy (SEM). A columnar microstructure was
observed in the single-, double- and triple-layer TBCs.
Phase analysis of the as-sprayed TBCs was carried out using
XRD (x-ray diffraction) where a tetragonal prime phase of
zirconia in the single-layer YSZ TBC and a cubic defect
fluorite phase of GZ in the double and triple-layer TBCs was
observed. Porosity measurements of the as-sprayed TBCs were
made by water intrusion method and image analysis method.
The as-sprayed GZ-based multi-layered TBCs were subjected to
erosion test at room temperature, and their erosion
resistance was compared with single-layer 8YSZ. It was shown
that the erosion resistance of 8YSZ single-layer TBC was
higher than GZ-based multi-layered TBCs. Among the
multi-layered TBCs, triple-layer TBC was slightly better
than double layer in terms of erosion resistance. The eroded
TBCs were cold-mounted and analyzed by SEM.},
cin = {IEK-1},
ddc = {670},
cid = {I:(DE-Juel1)IEK-1-20101013},
pnm = {113 - Methods and Concepts for Material Development
(POF3-113)},
pid = {G:(DE-HGF)POF3-113},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000392060300011},
doi = {10.1007/s11666-016-0479-4},
url = {https://juser.fz-juelich.de/record/826086},
}