Deuterium (D) plasma-driven permeation (PDP) experiments through reduced activation ferritic/martensitic (RAFM) steel with and without tungsten (W) deposition layer have been performed. The results confirm that W deposition does not always work as D permeation barrier, but enhances D permeation flux through the structural material under certain conditions. The steady state PDP fluxes through RAFM steel with a thin (∼30 nm) W deposition layer have been found to be larger than those of bare RAFM steel, whereas the RAFM steel membrane with a thick (6.0 μm) W deposition layer exhibits lower permeation fluxes than those of bare steel sample. Tritium Migration Analysis Program (TMAP) calculation indicates that the steady state permeation flux is determined by the D concentration accumulated at the interface between W layer and RAFM steel, which is highly relevant to the W deposition thickness. Only when the W thickness is larger than ∼2 μm, the steady state permeation flux will be controlled by diffusion in W deposition layer.

已通过具有和不具有钨（W）沉积层的还原活化铁素体/马氏体（RAFM）钢进行了氘（D）等离子体驱动的渗透（PDP）实验。结果证实，W沉积并不总是作为D的渗透屏障，而是在一定条件下增强了D渗透通过结构材料的通量。已经发现，穿过具有较薄（〜30 nm）W沉积层的RAFM钢的稳态PDP通量要比裸RAFM钢的稳态PDP通量大，而具有较厚（6.0μm）W沉积层的RAFM钢膜的渗透性较低。通量比裸钢样品大。Migration迁移分析程序（TMAP）的计算表明，稳态渗透通量由W层与RAFM钢之间的界面处积累的D浓度决定，这与W沉积厚度高度相关。仅当W的厚度大于〜2μm时，稳态渗透通量才由W沉积层中的扩散来控制。