LaNi5-xAlx (x=0~1.2)合金的循环储氢性能研究

Study on Cyclic Hydrogen Storage Properties of LaNi5-xAlx (x=0-1.2) Alloys

摘要:

通过真空感应熔炼法制备了LaNi5-xAlx (x=0, 0.25, 0.75, 1.2)储氢合金，并对其微观结构、力学性能、循环吸放氢性能及抗粉化性能进行了研究。结果表明，Al元素的加入能够明显改善合金晶体结构稳定性和储氢容量稳定性；随着Al含量的增加，合金的抗粉化性能呈现先减弱后增强的趋势；合金的力学性能和储氢容量共同影响着其抗粉化性能，其中力学性能是最主要的影响因素；在普通高纯氢气氛下，LaNi5-xAlx (x=0~1.2)合金的容量衰减主要是由于材料自身原因造成，很可能是发生了歧化反应

Abstract:

LaNi5-xAlx (x=0, 0.25, 0.75, 1.2) alloys were prepared by vacuum induction melting. The microstructure, mechanical property, cyclic stability of hydrogen absorption/desorption and pulverization resistance of the alloys were investigated. The results demonstrate that the addition of Al element can markedly improve the stability of crystal structure and hydrogen storage capacity of the alloys; with increase of the Al content, the pulverization resistance of the alloys becomes worse at first, and then is improved; mechanical property, which is the main factor, and hydrogen storage capacity jointly influence pulverization resistance property of the alloys; in the atmosphere of ordinary high-purity hydrogen, the main reason for the capacity attenuation of the LaNi5-xAlx (x=0-1.2) alloys should be their intrinsic properties, mostly maybe the disproportionation reaction