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@ARTICLE{Mauer:819879,
author = {Mauer, Georg and Du, Linnan and Vassen, Robert},
title = {{A}tmospheric {P}lasma {S}praying of {S}ingle {P}hase
{L}anthanum {Z}irconate {T}hermal {B}arrier {C}oatings with
{O}ptimized {P}orosity},
journal = {Coatings},
volume = {6},
number = {4},
issn = {2079-6412},
address = {Basel},
publisher = {MDPI},
reportid = {FZJ-2016-05455},
pages = {49},
year = {2016},
abstract = {The shortcomings at elevated operation temperatures of the
standard material yttria-stabilized zirconia (YSZ) for
thermal barrier coatings (TBCs) have initiated many research
activities seeking alternatives. One candidate is the
pyrochlore lanthanum zirconate La2Zr2O7 (LZ), which is
phase-stable to its melting point. At the same time, it
shows a lower thermal conductivity and a lower sintering
tendency when compared to YSZ. Because of its low thermal
expansion coefficient and poor toughness, it is applied in
combination with YSZ in double layer TBC systems. It is the
current state of knowledge that LZ is prone to lanthanum
depletion if processed by plasma spraying. The process
conditions have to be selected carefully to avoid this.
Furthermore, the amount and morphology of the coating
porosity is essential for a good thermo-mechanical
performance. In this work, the development and testing of
LZ/YSZ double layer TBC systems is described. Initially,
suitable basic parameters (torch, plasma gas composition,
and power) were tested with respect to coating
stoichiometry. Then, microstructures were optimized by
adjusting feed rate, spray distance, and by selecting a more
appropriate feedstock. Powder particles and coatings were
characterized by digital image analysis.},
cin = {IEK-1},
ddc = {660},
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:000392485400009},
doi = {10.3390/coatings6040049},
url = {https://juser.fz-juelich.de/record/819879},
}