Thermal shock of tungsten carbide in plasma-facing conditions
| Autor: | George Davey Smith, Samuel A. Humphry-Baker, Gerald Pintsuk |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Nuclear and High Energy Physics
Thermal shock Materials science Composite number chemistry.chemical_element 02 engineering and technology Tungsten 01 natural sciences 010305 fluids & plasmas chemistry.chemical_compound Tungsten carbide 0103 physical sciences Surface roughness General Materials Science Ceramic Composite material 0912 Materials Engineering Plasma-facing material Energy Plasma 021001 nanoscience & nanotechnology Nuclear Energy and Engineering chemistry visual_art visual_art.visual_art_medium 0210 nano-technology |
| Zdroj: | Journal of Nuclear Materials. 524:239-246 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2019.06.041 |
| Popis: | Tungsten carbide (WC) has been found to have higher resistance to plasma-induced thermal-shock compared to rolled tungsten. The electron beam device JUDITH 1 was used to simulate likely thermal shock conditions induced by edge localised modes and plasma disruptions. Loading conditions of 100–1000 cycles, heat fluxes of 0.19–1.13 GW/m 2 and base temperatures of 400–1000 °C were employed on two candidate WC-based materials: a monolithic WC ceramic, and a WC-FeCr composite. Surprisingly, the monolith outperformed the composite under all conditions. This was unexpected, particularly at low temperature, based on the calculated thermal shock resistance parameters. The result was explained by preferential melting of the metallic FeCr binder. Compared to available data collected under identical conditions on rolled tungsten plate, WC had lower surface roughness from thermal shock damage, particularly when tested at 400 °C. This shows promise for using WC as a plasma facing material; strategies for further improving performance are discussed. |
| Databáze: | OpenAIRE |
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