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Abstract

Tungsten carbide coating W(60)C(40) and W(85)C(15) prepared by chemical vapour deposition and consisting of different carbide phases, have been implanted with 0.8 keV, 1.5 keV and 3 keV deuterium ions at room temperature and elevated temperatures. The trapping and release of deuterium were investigated by means of re-emission and thermal desorption spectroscopy. The results have been compared with previous data from graphite and from tungsten prepared by various methods. It was found that a few percent of carbon impurities strongly increases the deuterium inventory in tungsten. The thermal desorption of deuterium from tungsten carbide occurs at temperatures much lower than for graphite and the spectral form shows much more complicated features. The peak temperatures, in this case, mainly depend on the carbon concentration in different phases of the samples. Chemical erosion was only detected for sample W(60)C(40) when all carbon atoms were eroded as volatile hydrocarbons while the physical sputtering of tungsten atoms limited the total erosion. Both fluence and temperature dependence of the chemical erosion are very similar to the results from the interaction of TiC with keV hydrogen ions.

Additional information

Authors: WANG W, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);ALIMOV V K, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);SCHERZER B M U, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);ROTH J, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 241-243 (1997) pp. 1087-1092
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