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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 a key functional material in the tritium treatment process. The decay of tritium and the helium produced by it will cause the hydrogen storage capacity of palladium to decrease. The sponge palladium aged at room temperature for 6.1 years was pretreated. The PCT curve of aged palladium sorption, liberation and deuterium was obtained by temperature-changing method. The experimental results of fresh palladium were also given. Based on this, the thermodynamic properties of tritium-aged palladium absorption, release and deuterium were studied. The results showed that the aging of tritium led to the right phase shift of the Pd-H system, the decrease of the plateau pressure and the decrease of the Pingtai area, and the aging effect had an effect on the lag effect, enthalpy change and entropy change of the Pd-H system.