Smart Tungsten-based Alloys for a First Wall of DEMO
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Abstract |
During an accident with loss-of-coolant and air ingress in DEMO, the temperature of tungsten first wall cladding may exceed 1000 °C and remain for months leading to tungsten oxidation. The radioactive tungsten oxide can be mobilized to the environment at rates of 10–150 kg per hour. Smart tungsten-based alloys are under development to address this issue. Alloys are aimed to function as pure tungsten during regular plasma operation of DEMO. During an accident, alloying elements will create a protective layer, suppressing release of W oxide. Bulk smart alloys were developed by using mechanical alloying and field-assisted sintering technology. The mechanical alloying process was optimized leading to an increased powder production by at least 40 %. Smart alloys and tungsten were tested under a variety of DEMO-relevant plasma conditions. Both materials demonstrated similar sputtering resistance to deuterium plasma. Under accident conditions, alloys feature a 40-fold reduction of W release compared to that of pure tungsten. |
Year of Publication |
2020
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Journal |
Fusion Engineering and Design
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Volume |
159
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Number of Pages |
111742
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Date Published |
10/2020
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DOI | |
PId |
4e141de3a05a87798e1241e374a2e2bf
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Alternate Journal |
Fusion Eng. Des.
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Label |
OA
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Attachment | |
Journal Article
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