钨粉中驻留氘去除技术研究

Study on Deuterium Removal Technology in Tungsten Powder

摘要:

氢同位素在钨基材料中的滞留及有效去除,对于材料在聚变堆工况下的损伤评估和氢同位素燃料的投放有着重要的意义。为消除块体钨的几何尺寸因素在氢同位素滞留与有效去除研究中的影响,本工作使用钨粉进行了氢同位素滞留与有效去除的研究,采用热解吸法与同位素置换法两种方式对气相热充进入钨粉的氘进行去除,获得了两种方式去除后钨粉中氘的残留量、脱附特征峰、固溶度等结果。结果表明,两种去除方式对于钨粉中驻留的表面吸附、低能陷阱捕获和高能陷阱捕获的氘都有明显的去除效果；两种去除方式达到平衡的时间与条件不同；同位素置换法相较热解吸法去除效果更好,但操作难度更大,综合考虑,热解吸法具有较大优势。

Abstract:

Tungsten is the material of choice for the first wall of magnetically constrained thermonuclear fusion reactors. The retention and effective removal of hydrogen isotopes in tungsten-based materials is of great significance for the damage assessment of materials under the conditions of fusion reactors and the placement of hydrogen isotope fuels. In order to eliminate the influence of the geometrical factors of bulk tungsten in the study of hydrogen isotope retention and effective removal, the work of hydrogen isotope retention and effective removal was carried out in this work, using thermal desorption and isotope exchange. By using these two methods, the deuterium retained in powder tungsten has been removed, and the residual amount, desorption characteristic peak and solid solubility of the tungsten powder in the two methods were obtained. The results show that the two removal methods have obvious removal effects on the three types of lanthanum residing in tungsten powder; the time and conditions for the two removal methods to reach equilibrium are different; the isotope exchange is more effective than the thermal desorption. However, its operation is more difficult, and the thermal desorption method has a greater advantage.