TY  - JOUR
AU  - Klein, Felix
AU  - Litnovsky, Andrey
AU  - Wegener, Tobias
AU  - Tan, Xiaoyue
AU  - Gonzalez-Julian, Jesus
AU  - Rasinski, Marcin
AU  - Schmitz, Janina
AU  - Linsmeier, Christian
AU  - Bram, Martin
AU  - Coenen, Jan Willem
TI  - Sublimation of advanced tungsten alloys under DEMO relevant accidental conditions
JO  - Fusion engineering and design
VL  - 146
IS  - Part A
SN  - 0920-3796
CY  - New York, NY [u.a.]
PB  - Elsevier
M1  - FZJ-2019-04067
SP  - 1198-1202
PY  - 2019
AB  - Tungsten (W) is deemed as the main candidate for the first wall armor material of future fusion power plants such as DEMO. Advantages of W include a high melting point, low erosion yield, low tritium retention, and a high thermal conductivity. One issue concerning W is the oxidation resistance in case of a loss-of-coolant accident with simultaneous air ingress. The major challenge in such a scenario is to suppress the sublimation which is responsible for a release of radioactivity. This work studies an alloy containing tungsten (W), 12 weight % chromium (Cr), and 0.6 weight % yttrium (Y) in DEMO-relevant conditions: a temperature in the range of 1100 K to 1473 K in humid air. The sublimation rates are measured for the first time in humid air. Tungsten oxide sublimates at a rate of 1.4 × 10−4 mg cm−2 s−1 at 1273 K in humid air. At the same conditions the alloy suppresses sublimation by more than one order of magnitude as compared to that of pure W. This suppression is achieved due to the formation of a protective chromium oxide layer on the surface of the sample. Details about the protection mechanisms are presented and discussed. Testing is performed for up to 10 days.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000488307400268
DO  - DOI:10.1016/j.fusengdes.2019.02.039
UR  - https://juser.fz-juelich.de/record/864233
ER  -