Spreading of lithium on a stainless steel surface at room temperature

JOURNAL OF NUCLEAR MATERIALS

卷:468

Article

Skinner, C. H.¹  Capece, A. M.¹  Roszell, J. P.²  Koel, B. E.² 

[1] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[2] Princeton Univ, Dept Chem & Biol Engn, Princeton, NJ 08540 USA

关键词: Lithium;    Stainless steel;    Surface analysis;    P0500 plasma-materials interaction;    L0300 lithium;    S1300 surface effects;    R0900 redeposition;   

DOI  :  10.1016/j.jnucmat.2015.10.059

来源: Elsevier

【 摘 要 】

Lithium conditioned plasma facing surfaces have lowered recycling and enhanced plasma performance on many fusion devices and liquid lithium plasma facing components are under consideration for future machines. A key factor in the performance of liquid lithium components is the wetting by lithium of its container. We have observed the surface spreading of lithium from a mm-scale particle to adjacent stainless steel surfaces using a scanning Auger microprobe that has elemental discrimination. The spreading of lithium occurred at room temperature (when lithium is a solid) from one location at a speed of 0.62 mu m/day under ultrahigh vacuum conditions. Separate experiments using temperature programmed desorption (TPD) investigated bonding energetics between monolayer-scale films of lithium and stainless steel. While multilayer lithium desorption from stainless steel begins to occur just above 500 K (E-des = 1.54 eV), sub-monolayer Li desorption occurred in a TPD peak at 942 K (E-des = 2.52 eV) indicating more energetically favorable lithium-stainless steel bonding (in the absence of an oxidation layer) than lithium lithium bonding. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free