Deuterium retention in plasma spray tungsten coatings exposed to low-energy, high flux D plasma

Autor:	J. Roth, Toshihiko Yamanishi, Kanetsugu Isobe, V.Kh. Alimov, Hideo Nakamura, B. Tyburska-Püschel, O. V. Ogorodnikova
Rok vydání:	2011
Předmět:	Nuclear and High Energy Physics Materials science Thermal desorption spectroscopy Dangling bond Analytical chemistry chemistry.chemical_element Plasma Tungsten Nuclear Energy and Engineering chemistry Deuterium General Materials Science Graphite Thermal spraying Carbon
Zdroj:	Journal of Nuclear Materials. 414:479-484
ISSN:	0022-3115
DOI:	10.1016/j.jnucmat.2011.05.041
Popis:	Two types of porous plasma spray tungsten coatings deposited onto stainless steel and graphite substrates were exposed to low-energy (76 eV D 2 + ), high-flux (1022 D/m2 s) D plasma to ion fluences of (3–4) × 1026 D/m2 at various temperatures. Deuterium retention in the W coatings was examined by thermal desorption spectroscopy and the D(3He,p)4He nuclear reaction, allowing determination of the D concentration at depths up to 7 μm. The relatively high D concentration (above 0.1 at.%) at depths of several micrometers observed after D plasma exposure at 340–560 K can be related to accumulation of D2 molecules in pores, while at temperatures above 600 K deuterium is accumulated mainly in the form of D atoms chemisorbed on the inner pore surfaces. At exposure temperatures above 500 K, the D retention in the plasma spray W coating on graphite substrate increases significantly due to trapping of diffusing D atoms at carbon dangling bonds located at the edge of a graphite crystallite.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::545db7b883ce3241fd30c8623a4c0d60 https://doi.org/10.1016/j.jnucmat.2011.05.041 Zobrazit plný text záznamu Full Text from ScienceDirect