Ti改性ZrCo贮氚合金的抗氢致歧化机制研究

Effects and Mechanism of Ti Substitution on the Ability of Anti-Disproportionation of Zirconium Cobalt–Hydrogen System

采用电弧熔炼的方法制备Ti掺杂改性的ZrCo贮氚合金,采用X射线衍射(XRD)表征所制备合金及其氢化物的相结构,通过精修方法获得晶格常数,采用恒容等温法测试改性合金的歧化动力学,并采用DSC研究所制备不同含量Ti改性ZrCo合金的氢化物及其歧化产物的近平衡放氢过程。结果表明:Ti掺杂造成ZrCo合金的晶格常数缩减,提升第一步放氢温度,大幅改善抗氢致歧化性能,推测通过Ti掺杂可改变ZrCo合金的可供氢原子占据间隙位尺寸影响间隙位的稳定性,从而影响歧化性能。

ZrCo alloys with Ti substitution were prepared via the arc-melting method, and then the products before and after hydrogenation were characterized by X-ray diffraction. Results showed that the crystal structure of ZrCo alloys substituted with Ti substitution formed cubic phase, and the lattice parameters of ZrCo alloys and these hydrides decreased with Ti substituted. And the kinetics of the hydrogen-induced disproportionation in the desorption mode for all these alloys was also investigated. Results demonstrated that the rate and extent of the disproportionation of ZrCo alloys decreased with the content of Ti substitution. It could be inferred that the effect of element substitution on the disproportionation of ZrCo alloys was caused by the radius change of hole sizes of hydrogen occupation sites.