کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1566803 999826 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Deuterium retention in plasma spray tungsten coatings exposed to low-energy, high flux D plasma
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
Deuterium retention in plasma spray tungsten coatings exposed to low-energy, high flux D plasma
چکیده انگلیسی

Two types of porous plasma spray tungsten coatings deposited onto stainless steel and graphite substrates were exposed to low-energy (76 eV D2+), 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 414, Issue 3, 31 July 2011, Pages 479–484
نویسندگان
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