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@ARTICLE{Litnovsky:829726,
author = {Litnovsky, A. and Wegener, T. and Klein, F. and Linsmeier,
Ch and Rasinski, M. and Kreter, A. and Tan, X. and Schmitz,
J. and Mao, Y. and Coenen, J. W. and Bram, M. and Gonzalez,
Jesus},
title = {{A}dvanced smart tungsten alloys for a future fusion power
plant},
journal = {Plasma physics and controlled fusion},
volume = {59},
number = {6},
issn = {1361-6587},
address = {Bristol},
publisher = {IOP Publ.},
reportid = {FZJ-2017-03364},
pages = {064003 -},
year = {2017},
abstract = {The severe particle, radiation and neutron environment in a
future fusion power plant requires the development of
advanced plasma-facing materials. At the same time, the
highest level of safety needs to be ensured. The so-called
loss-of-coolant accident combined with air ingress in the
vacuum vessel represents a severe safety challenge. In the
absence of a coolant the temperature of the tungsten first
wall may reach 1200 °C. At such a temperature, the
neutron-activated radioactive tungsten forms volatile oxide
which can be mobilized into atmosphere. Smart tungsten
alloys are being developed to address this safety issue.
Smart alloys should combine an acceptable plasma performance
with the suppressed oxidation during an accident. New thin
film tungsten–chromium–yttrium smart alloys feature an
impressive 105 fold suppression of oxidation compared to
that of pure tungsten at temperatures of up to 1000 °C.
Oxidation behavior at temperatures up to 1200 °C, and
reactivity of alloys in humid atmosphere along with a
manufacturing of reactor-relevant bulk samples, impose an
additional challenge in smart alloy development. First
exposures of smart alloys in steady-state deuterium plasma
were made. Smart tungsten–chroimium–titanium alloys
demonstrated a sputtering resistance which is similar to
that of pure tungsten. Expected preferential sputtering of
alloying elements by plasma ions was confirmed
experimentally. The subsequent isothermal oxidation of
exposed samples did not reveal any influence of plasma
exposure on the passivation of alloys.},
cin = {IEK-4 / IEK-1},
ddc = {530},
cid = {I:(DE-Juel1)IEK-4-20101013 / I:(DE-Juel1)IEK-1-20101013},
pnm = {113 - Methods and Concepts for Material Development
(POF3-113) / HITEC - Helmholtz Interdisciplinary Doctoral
Training in Energy and Climate Research (HITEC)
(HITEC-20170406)},
pid = {G:(DE-HGF)POF3-113 / G:(DE-Juel1)HITEC-20170406},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000400090800001},
doi = {10.1088/1361-6587/aa6948},
url = {https://juser.fz-juelich.de/record/829726},
}