CLAM钢中氕氘的渗透与去除

Permeation and Release Behavior of Protium/Deuterium in CLAM Steel

低活化铁素体/马氏体钢(RAFM钢)是聚变堆产氚包层的优选结构材料。氢同位素在结构材料中的扩散渗透特性关系到产氚回收率、燃料循环及运行安全。本工作对国内研发RAFM钢之一的CLAM钢进行了气体驱动的氘渗透实验,得到573~873K温度范围内氘的宏观溶解度S(mol/(m3·Pa0.5))为0.264exp(-22 447/RT),扩散系数D(m2/s)为1.38×10-7exp(-17 271/RT),渗透率Φ(mol/(m·s·Pa0.5))为3.64×10-8exp(-39 718/RT)。还进行了氕氘气体混合物的渗透实验,确认了渗透同位素效应;探索了钢中溶解氘的真空热释放去除。

The reduced activation ferritic/martensitic（RAFM）steel is a promising structure material candidate for tritium blanket module in fusion reactor.Hydrogen isotopes transport within the material must be well characterized for affecting the tritium recovery from the module,the self-sufficiency of the fusion fuel recycling and the radiological safety.The deuterium transport parameters of diffusivity,Sieverts constant and permeability in CLAM（China low activation martensitic）steel which is one of RAFM steel developed in China were experimentally measured by means of the gas permeation technique over the temperature range of 573-873 K with driving pressure from 0.03 to0.1 MPa.The resultant transport parameters are：A Sieverts constant of S（mol/（m3·Pa0.5））=0.264 exp（-22 447/RT）,a diffusivity of D（m2/s）=1.38×10^（-7）·exp（-17 271/RT）and a permeability ofΦ（mol/（m·s·Pa0.5））=3.64×10^（-8）·exp（-39 718/RT）.There is an obvious isotope effect on H-D mixture permeation in which permeability of deuterium is less than that of protium.Experiments and theoretical analysis reveal that thermal release at high temperature shall be an efficient way for removal of the deuterium dissolved in the steel.