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@ARTICLE{Grnwald:851466,
author = {Grünwald, Nikolas and Sohn, Yoo Jung and Yin, Xiaoyan and
Menzler, Norbert H. and Guillon, Olivier and Vaßen, Robert},
title = {{M}icrostructure and {P}hase {E}volution of {A}tmospheric
{P}lasma {S}prayed {M}n-{C}o-{F}e {O}xide {P}rotection
{L}ayers for {S}olid {O}xide {F}uel {C}ells},
journal = {Journal of the European Ceramic Society},
volume = {39},
issn = {0955-2219},
address = {Amsterdam [u.a.]},
publisher = {Elsevier Science},
reportid = {FZJ-2018-05102},
pages = {449-460},
year = {2019},
abstract = {Dense protective layers are needed to reduce
chromium-related degradation in SOFC stacks. In particular,
atmospheric plasma sprayed (APS) Mn1.0Co1.9Fe0.1O4 (MCF)
coatings demonstrated low degradation rates in stack tests.
We show that short-term annealing in air induces crack
healing within these coatings. Parallel to this effect, a
phase transformation is observed originating from oxidation
that proceeds by solid state-diffusion. The present
contribution reveals the basic mechanisms of the
microstructural and phase changes of coatings in long-term
annealing tests of up to 10,000 h at 700 °C. The layer
develops differently at the air-facing surface and in the
bulk. Due to cation deficiency, oxidation is dominated by
cation outward diffusion, leading to a Co-enriched surface
layer. The bulk displays a fine distribution of the initial
(rock salt) and the final (spinel) phases. Understanding the
mechanisms leading to these irreversible changes enables
predictions to be made concerning durable protectivecoatings
in SOFCs.},
cin = {IEK-1 / JARA-ENERGY},
ddc = {660},
cid = {I:(DE-Juel1)IEK-1-20101013 / $I:(DE-82)080011_20140620$},
pnm = {113 - Methods and Concepts for Material Development
(POF3-113)},
pid = {G:(DE-HGF)POF3-113},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000450379400040},
doi = {10.1016/j.jeurceramsoc.2018.08.027},
url = {https://juser.fz-juelich.de/record/851466},
}