氘在低活化铁素体/马氏体钢相关再沉积层中的热脱附行为

Deuterium Release Behaviors of Related Re-deposited Layers of RAFM Steel

采用直流磁控溅射法,在氩气和氘气混合气氛下溅射金属靶制备铁、铬及钨与氘的共沉积层,模拟核聚变装置中燃料等离子体作用下低活化铁素体/马氏体(RAFM)钢第一壁材料表面再沉积层。分别考察了在磁控溅射腔室及直线等离子体模拟装置两种平台下,氘等离子体辐照对RAFM钢相关再沉积层中氘热脱附与滞留行为的影响。研究结果表明:氘与金属共沉积的RAFM钢相关涂层中,氘热脱附行为因受材料本身的组分和结构影响而存在差异;不同的氘等离子体辐照环境对氘在共沉积涂层中捕获形式的影响不同;总体而言,两种氘等离子体辐照后,均有大量氘滞留在RAFM钢相关再沉积层中,且氘总滞留量随氘等离子体辐照通量的增大而增大;铁基和钨基涂层中的氘滞留总量相当,均比铬基的低出1-2个数量级。

Co-deposited layers of iron,chromium,or tungsten with deuterium were prepared by dc magnetron sputtering in a mixed atmosphere of argon and deuterium(D).The purpose of the above process was to simulate the surface re-deposited layers of reduced activation ferritic martensitic(RAFM)steel under the fuel plasma in the fusion device.Deuterium release behaviors of the samples were studied when they respectively exposed to two deuterium plasmas from the magnetron sputtering chamber and the linear experimental plasma system.Results show that the thermal desorption behavior of D in the co-deposited layers varies with the composition and structure of the materials.Different D plasma exposure environments have different effects on the trapping forms of D in the layers.In general,a large amount of D was trapped in the layers after exposed to both D plasmas,and total D retentions in these related re-deposited layers of RAFM steel increase with D fluence.Total D retentions in the iron-based and tungsten-based layers are comparable,and 1-2 orders of magnitude lower than those in the chrome-based layers.