氚老化对海绵钯吸、放氕氘热力学性质的影响

Effects of Tritium Aging on Thermodynamics of Sponge Palladium Absorbing/Desorbing Protium and Deuterium

钯是氚处理工艺中的关键功能材料,氚衰变及其产生的氦会引起钯的贮氢性能下降。对室温下贮氚老化1.6年的海绵钯进行了预处理,采用变温法获得了老化钯吸、放氕和氘的PCT曲线,作为对比,同时给出了新鲜钯的实验结果。在此基础上,进行了氚老化钯吸、放氕和氘热力学性质分析。结果显示,氚老化会导致钯氢体系的α相右移、坪台压降低、坪台区变窄,且老化效应对钯氢体系的滞后效应、焓变及熵变产生影响。

Palladium is an important functional material in tritium treating technology. Tritium decay and its product, helium-3, will decrease the properties of hydrogen storage of palladium. In this paper, the PCT curves of absorbing/desorbing protium and deuterium were measured by a varying temperature method for aged palladium after 1.6 years tritium storage. The experimental results of fresh sponge palladium were provided for comparison; furthermore, thermodynamics of the aged palladium absorbing/desorbing protium and deuterium was analyzed. Comparing with the fresh palladium, tritium aging compels α phase zone to shift right, decreases the plateau pressures of aged Pd-H and Pd-D systems as narrowing down the scope of the plateau pressures. The tritium aging weakens the hysteresis effect of palladium absorbing/desorbing hydrogen and affects the enthalpy and entropy changes of the formation of palladium hydride.