Al替代Ni对LaNi_(5-x)Al_x性能的影响  

Effects of Al Substitution for Ni on the Properties of LaNi_(5-x)Al_x

作　　者：曹大力[1] 张瑞静[1] 冷海燕[1] 陈德敏[1] 吕曼祺[1] 杨柯[1] 

机构地区：[1]中国科学院金属研究所

出　　处：《稀土》2004年第3期5-8,共4页Chinese Rare Earths

摘　　要：通过对LaNi5-xAlx(x=0.25,0.5,0.75,1.0)系合金及其氢化物的晶体结构XRD分析,发现Al的添加并未改变合金的晶体结构类型,只是晶格常数变大。对合金的热力学性能实验研究表明,随着Al含量的增加,贮氢合金的平衡氢压降低,吸氢量减少,滞后现象得到改善,焓变值的绝对值增加。对合金的动力学性能实验研究表明,吸氢速度随x的增加而减慢。A series of hydrogen storage alloys LaNi_(5-x)Al_x(x=0.25, 0.50, 0.75,1.00) are studied. X-ray diffraction analyses of the alloys and their hydrides show that the crystal structures of alloys do not change with the addition of Al, but the lattice constants slightly increase. It can be found by measuring thermodynamic properties of alloys-H_2 system that equilibrium pressure,hydrogen absorptivity and hystersis decrease, but the absolute values of the enthalpy increase with x increasing. Also it can be found that hydrogen absorbing velocity of the alloys decrease with x increasing.

关 键 词：LaNi5-xAlx系合金 晶体结构 热力学性能 吸氢速度 

分 类 号：TG146.45[一般工业技术—材料科学与工程] TG146.15[金属学及工艺—金属材料]