2013
DOI: 10.1585/pfr.8.1405159
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Chemical Binding States of Carbon Atoms Migrated in Tungsten Coating Layer Exposed to JT-60U Divertor Plasmas

Abstract: Carbon migration in the tungsten coating layer exposed to JT-60U divertor plasmas has been investigated by analysis of chemical binding states of the carbon atoms. More than 1% of carbon atoms were accumulated as graphitic carbon, amorphous carbon and/or carbon-deuterium bonds. This concentration was more than five orders of magnitude higher than the solubility of carbon atoms in tungsten lattice. Up to 20% of ditungsten carbide (W 2 C) was also formed in the tungsten coating layer. These findings suggested th… Show more

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“…Hence, the formation of graphite suggests that injected carbon migrates preferentially through grain boundaries (or grain surfaces) and pore surfaces in the tungsten coating layer, as discussed in Ref. [16].…”
Section: Carbon Migration and Its Difference From Polycrystalline Tunmentioning
confidence: 89%
See 1 more Smart Citation
“…Hence, the formation of graphite suggests that injected carbon migrates preferentially through grain boundaries (or grain surfaces) and pore surfaces in the tungsten coating layer, as discussed in Ref. [16].…”
Section: Carbon Migration and Its Difference From Polycrystalline Tunmentioning
confidence: 89%
“…Therefore, because the carbon fluence could be too low to saturate grain surfaces and pore surfaces with carbon and enable carbon atoms to penetrate into tungsten grains, WC and W 2 C were not formed in the tungsten coating layer. Note that because W 2 C is formed in the tungsten coating layer exposed to JT-60U divertor plasmas [16], WC or W 2 C are expected to be formed by mixed ion beam irradiation for longer times or higher sample temperatures.…”
Section: Carbon Migration and Its Difference From Polycrystalline Tunmentioning
confidence: 99%