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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。
The LaNi5-xAlx (x = 0,0.25,0.75,1.2) hydrogen storage alloy was prepared by vacuum induction melting method. The microstructure, mechanical properties, cyclic hydrogen absorption and desorption performance were studied. The results show that the addition of Al can obviously improve the stability of the crystal structure and the stability of the hydrogen storage capacity. With the increase of Al content, the anti-pulverization properties of the alloy decrease first and then increase. The mechanical properties and hydrogen storage Its capacity is the most important influencing factor on the anti-pulverization performance. The mechanical properties of the LaNi5-xAlx (x = 0 ~ 1.2) alloy are mainly caused by the material itself due to its mechanical properties. Disproportionation has taken place.