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@ARTICLE{Emmerich:851209,
author = {Emmerich, Thomas and Qu, Dandan and Vaßen, Robert and
Aktaa, Jarir},
title = {{D}evelopment of {W}-coating with functionally graded
{W}/{EUROFER}-layers for protection of {F}irst-{W}all
materials},
journal = {Fusion engineering and design},
volume = {128},
issn = {0920-3796},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2018-04909},
pages = {58 - 67},
year = {2018},
abstract = {To protect First-Wall components, made of reduced
activation ferritic martensitic steel, against the plasma of
future fusion reactors, tungsten coatings are a feasible
option. The difference in coefficient of thermal expansion
between the coating and the steel substrate can be
compensated using functionally graded material layers. Such
layers were successfully produced by vacuum plasma spraying.
This technique reduces, however, the hardness of the
substrate surface near zone. Modified spraying parameters
moderate the hardness loss. The parameters may, though,
affect also the layer bonding toughness which is evaluated
in this work by four point bending tests. Furthermore, the
layers behavior on First-Wall Mock‐ups and under different
thermal loads is investigated by finite element
simulations.The measurement of the layer adhesion indicates
that the layer adhesion decreases only for modified spraying
parameters that do not reduce the substrate hardness. It
follows also from the toughness calculation that without
layer residual stresses the toughness values depend on
coating thickness. In regard to the Mock‐up behavior the
simulations show that intermediate steps are necessary
during heating and cooling to prevent artificial stresses
and inelastic deformation. It is, however, not possible to
avoid stresses and inelastic deformation completely as they
originate from the residual stresses.},
cin = {IEK-1},
ddc = {620},
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:000428492500009},
doi = {10.1016/j.fusengdes.2018.01.047},
url = {https://juser.fz-juelich.de/record/851209},
}