LaNiAl材料储氚老化氚踵特性

摘要

The equilibrium desorption isotherms curves (PCT curves ),the characteristics of tritium heels of tritium reacting with LaNiAl alloys which aged for 300,1 000,and 1 200 days were investigated at constant temperature and volume in our metal hydride research system,and the process of protium exchange tritium heels was also studied.The results show that LaNiAl alloys have significant tritium aging effects with an increase in the aging time,which include the isotherms change,decreasing the desorption pressures,increasing the isotherm plateau slopes,decreasing the total storage capacity,and increasing the tritium heels.The model of tritium heels vs aging time was established and compared with the results of American tritium aging experiments.Exchange of the tritium with the lighter iso-topes protium is an effective method for remove of residual tritium from aged LaNiAl alloys. In the study,10 exchange cycles are effective in reducing the tritium inventory from T/M=0. 128 27 to 0. 000 02,and the tritium heels are almost recovered.%采用研制的全金属吸放氚系统,恒温等容条件下,针对 LaNiAl 系列储氚材料,测定了储氚老化 300、1 000、1 200 d左右吸放氚等温解吸曲线(PCT特性曲线)、氚踵特性,并开展了氚踵的氢排代回收工艺研究.测试结果表明:随着老化时间的延长,LaNiAl材料均表现出明显的氚老化特性:吸放氚PCT 特效曲线改变,坪台压降低,坪斜增大,可逆吸放氚容量减少,氚踵逐渐形成并升高.建立了氚踵数学模型,并与美国氚老化测试结果进行了对比.氢氚排代置换实验研究结果表明:经过10 次氢排代置换氚,材料中残余氚量从氚金属原子比(T/M)= 0.128 27 降低到0.000 02,几乎可全部回收合金中氚.