氚老化对海绵钯吸、放氕氘热力学性质的影响

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。

Tritium aging effects on thermodynamics of sponge palladium absorbing/desorbing protium and deuterium

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. The PcT curves of absorbing/desorbing protium and deuterium were measured by the varying temperature method for aged palladium after 1.6 years tritium storage, the experimental results of fresh sponge palladium were provided for comparison in this work, furthermore, thermodynamics of the aged palladium absorbing/desorbing protium and deuterium was analyzed. Comparing with the fresh palladium, tritium aging compel a 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, further analyzing shows that the tritium aging weakens the hysteresis effect of palladium absorbing/desorbing hydrogen, affects the enthalpy and entropy changes of the formation of palladium hydride.