摘要
采用三步感应熔炼法制备了La_(1-x) Mg_xNi_(4.25)Al_(0.75)(x=0.0,0.1,0.2,0.3)储氢合金,研究了该系列合金的晶体结构和储氢性能。结果表明,当x为0.0和0.1时,合金由单一的La Ni4Al相组成;而x为0.2和0.3时,合金由La Ni4Al相,(La,Mg)Ni3相和AlN i3相构成。随着Mg含量x从0.2增至0.3时,合金的第二相丰度和吸/放氢平衡压明显升高,同时储氢容量减小。研究发现,当Mg添加量x=0.1时,合金除具有良好的储氢容量和低平台压外,其吸氢动力学性能更好。
La1-x MgxNi4.25Al0.75(x=0.0, 0.1, 0.2, 0.3) hydrogen storage alloys were prepared by a three-step induction melting. Their crystal structures and hydrogen storage properties were investigated. Results show that alloys with x=0.0 and 0.1 contain a single La Ni4 Al phase; however, those with x=0.2 and 0.3 are composed of La Ni4 Al,(La, Mg)Ni3 and AlN i3 phases. With x increasing from 0.2 to 0.3, the abundances of the secondary phases and the plateau pressures in the pressure-composition isotherms are lifted significantly. Meanwhile, their hydrogen storage capacities are remarkably reduced. It is found that the alloy with x=0.1 possesses the fastest absorption kinetics compared to the others as well as a good hydrogen capacity and a low plateau pressure.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第1期56-61,共6页
Rare Metal Materials and Engineering
基金
Strategic Priority Research Program of the Chinese Academy of Sciences(XDA02020200)
National Natural Science Foundation of China(11475145)
关键词
稀土储氢合金
Mg替代
储氢性能
RE hydrogen storage alloy
Mg substitution
hydrogen storage property