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| 001 | 836011 | ||
| 005 | 20240711113521.0 | ||
| 024 | 7 | _ | |a 10.1016/j.fusengdes.2017.03.072 |2 doi |
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| 100 | 1 | _ | |a Wegener, Tobias |0 P:(DE-Juel1)161367 |b 0 |e Corresponding author |u fzj |
| 245 | _ | _ | |a Development and analyses of self-passivating tungsten alloys for DEMO accidental conditions |
| 260 | _ | _ | |a New York, NY [u.a.] |c 2017 |b Elsevier |
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| 520 | _ | _ | |a Tungsten 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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| 773 | _ | _ | |a 10.1016/j.fusengdes.2017.03.072 |g p. S092037961730296X |0 PERI:(DE-600)1492280-0 |p 183-186 |t Fusion engineering and design |v 124 |y 2017 |x 0920-3796 |
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