快淬纳米晶/非晶Mg2-xLaxNi (x=0～0.6)合金的贮氢动力学

稀有金属, 2012, (1): 67-73. doi: 10.3969/j.issn.0258-7076.2012.01.012

快淬纳米晶/非晶Mg2-xLaxNi (x=0～0.6)合金的贮氢动力学

马志鸿 ^1, , 李波 ^2, , 赵栋梁 ^3, , 李霞 ^4, , 张国芳 ^5, , 张羊换 ^6,

1.钢铁研究总院功能材料研究所,北京100081;包头稀土研究院科技处,内蒙古自治区包头014010

2.钢铁研究总院功能材料研究所,北京100081

3.钢铁研究总院功能材料研究所,北京100081

4.钢铁研究总院功能材料研究所,北京100081;内蒙古科技大学省部共建国家重点实验室培育基地,内蒙古自治区包头014010

5.钢铁研究总院功能材料研究所,北京100081;内蒙古科技大学省部共建国家重点实验室培育基地,内蒙古自治区包头014010

6.钢铁研究总院功能材料研究所,北京100081;内蒙古科技大学省部共建国家重点实验室培育基地,内蒙古自治区包头014010

基金项目: 国家自然科学基金(50871050和50961001) 内蒙古自治区自然基金重大项目(2010ZD05)

关键词： Mg2 Ni型合金 , 快淬 , La替代Mg , 贮氧动力学

Hydrogen Storage Kinetics of Nanocrystalline/Amorphous Mg2-xLaxNi (x =0 ～ 0.6 ) Alloys Prepared by Melt Spinning

为了改善Mg2Ni型合金气态及电化学贮氢动力学性能,用La部分替代合金中的Mg,用快淬技术制备了Mg2-xLaxNi(x=0,0.2,0.4,0.6)合金,用XRD,SEM,HRTEM分析了铸态及快淬态合金的微观结构；用自动控制的Sieverts设备测试了合金的气态贮氢动力学性能,用程控电池测试仪测试了合金的电化学贮氢动力学.结果发现,快淬无La合金具有典型的纳米晶结构,而快淬含La合金显示了以非晶相为主的结构,表明La替代Mg提高Mg2Ni型合金的非晶形成能力.La替代Mg明显地改变Mg2Ni型合金的相组成.当La替代量x=0.4时,合金的主相改变为(La,Mg) Ni3+ LaMg3.合金的气态及电化学吸放氢动力学对La含量及快淬工艺敏感,La替代使合金的吸氢动力学降低,但适量的La替代可以明显改善合金的放氢动力学及高倍率放电能力.适当的快淬处理可以提高合金的气态及电化学贮氢动力学,但获得最佳贮氢动力学的快淬工艺与合金的成分密切相关.

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