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000836011 1001_ $$0P:(DE-Juel1)161367$$aWegener, Tobias$$b0$$eCorresponding author$$ufzj
000836011 245__ $$aDevelopment and analyses of self-passivating tungsten alloys for DEMO accidental conditions
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000836011 520__ $$aTungsten is considered the main candidate material for the first-wall in DEMO due to its high melting point, low erosion yield and low tritium retention. Nevertheless, it can cause a substantial safety issue in a loss-of-coolant accident (LOCA) in combination with air ingress into the plasma vessel, due to the formation and sublimation of volatile neutron activated tungsten oxide. Self-passivating tungsten alloys introduce a passive safety mechanism by forming a stable chromic oxide scale on the surface acting as a diffusion barrier for oxygen and preventing the formation of tungsten oxide. Self-passivating tungsten alloys optimized for oxidation resistance containing ∼12 wt.% Cr and ∼0.6 wt.% Y are investigated under conditions of argon–oxygen, humid argon and humid air atmospheres at different partial pressures and temperatures ranging from 1073 to 1273 K. Thin films with ∼3.5 μm thickness produced by magnetron sputter deposition are used as a model system. The oxidation resistance of these films in an argon–20 vol.% oxygen atmosphere is sufficient to prevent formation and release of tungsten oxide at temperatures of from 1073 to 1273 K. The sublimation of Cr in nitrogen–oxygen–water atmosphere at T ≥ 1273 K is discussed. A deeper understanding of the governing processes for oxygen/Cr diffusion under different atmospheres is gained, supported by SEM/EDX in combination with FIB cross-section and TGA measurements.
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000836011 7001_ $$0P:(DE-Juel1)166427$$aKlein, Felix$$b1$$ufzj
000836011 7001_ $$0P:(DE-Juel1)130090$$aLitnovsky, Andrey$$b2$$ufzj
000836011 7001_ $$0P:(DE-Juel1)162160$$aRasinski, Marcin$$b3$$ufzj
000836011 7001_ $$0P:(DE-Juel1)164284$$aBrinkmann, Jens$$b4
000836011 7001_ $$0P:(DE-HGF)0$$aKoch, Freimut$$b5
000836011 7001_ $$0P:(DE-Juel1)157640$$aLinsmeier, Christian$$b6$$ufzj
000836011 773__ $$0PERI:(DE-600)1492280-0$$a10.1016/j.fusengdes.2017.03.072$$gp. S092037961730296X$$p183-186$$tFusion engineering and design$$v124$$x0920-3796$$y2017
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