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通过PCT(pressure-composition-temperature)吸氢性能实验研究了温度(700~900℃)和Nb含量(1%~30%,质量分数)对Zr-Nb合金吸氢性能的影响。结果表明,温度的变化对β-Zr相和δ氢化锆相的两相平衡有较大影响,β-Zr相较δ氢化锆相的高温稳定性更强。Nb的添加降低了体系与H结合的稳定性,随着Nb含量的增加,合金的最大吸氢量明显减少。相同温度条件下,β-Zr相和δ氢化锆相两相平台所对应的平衡氢分压随Nb含量增加而升高。Nb降低合金最大吸氢量的主要原因是高氢含量的δ相NbH2氢化物在低压下不能稳定存在。
The effect of temperature (700 ~ 900 ℃) and Nb content (1% ~ 30%, mass fraction) on the hydrogen-absorbing properties of Zr-Nb alloy was investigated by hydrogen absorption performance of PCT (pressure-composition-temperature) The results show that the change of temperature has a great influence on the two-phase equilibrium of β-Zr phase and δ-zirconium hydride phase. The β-Zr phase is more stable than the δ-zirconium hydride phase at high temperature. The addition of Nb reduced the stability of the system combined with H, with the increase of Nb content, the maximum hydrogen absorption capacity of the alloy decreased obviously. Under the same temperature, the equilibrium partial pressure of hydrogen corresponding to the β-Zr phase and the δ-zirconium hydride phases increased with the increase of Nb content. The main reason that Nb reduces the maximum hydrogen absorption capacity of the alloy is that the δ-phase NbH2 hydride with high hydrogen content can not be stably present under low pressure.