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烧结工艺对贮氢合金La0.67Mg0.33Ni2.5Co0.5的微观组织结构及电化学性能影响的研究 被引量:2

A study on the sintering synthesis and the micro-structural and electrochemical properties of La0.67Mg0.33Ni2.5Co0.5 hydrogen storage alloy
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摘要 系统研究了固相反应烧结方法制备La0.67Mg0.33Ni2.5Co0.5贮氢合金的烧结工艺对该合金的微观组织结构及电化学性能的影响规律.分析和研究了合金的微观组织结构、电化学放电性能及Mg含量的挥发损失问题.XRD和SEM及EPMA分析结果表明,在不同烧结条件下合金均由不合Mg的LaNi5相、富Mg的LaNi3相及一个贫Mg的LaNix(x=3.0~3.8)相三相组成.当烧结温度不超过1203k时合金主相为LaNi3相,当烧结温度超过1203K,LaNi5相逐步成为主相.原子吸收光谱分析结果表明,烧结温度不超过1203K,Mg元素没有明显损失;当烧结温度超过1203K,会引起Mg的大量挥发损失.电化学性能分析结果表明,烧结温度不超过1203K,合金放电能力主要受合金组织形成与均匀性影响;而烧结温度超过1203K,Mg元素挥发损失成为影响合金放电能力的决定因素.烧结条件为873~1123k保持24h、1203k保持2h,是制备La0.67Mg0.33Ni2 5Co0.5贮氢合金的适宜工艺.用该工艺制备的La0 67Mg0.33Ni2.5Co0.5贮氢合金Mg含量稳定(2.92%质量分数)、微观组织均匀、放电容量高(395mAh/g)、活化性能好(2个循环).
出处 《功能材料》 EI CAS CSCD 北大核心 2004年第z1期1969-1973,共5页 Journal of Functional Materials
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同被引文献10

  • 1张法亮,罗永春,阎汝煦,康龙,陈剑虹.La2-xMgxNi7.0(x=0.4,0.5,0.6,0.7,0.8)贮氢合金结构和电化学性能的研究[J].功能材料,2004,35(z1):1900-1904. 被引量:3
  • 2张羊换,董小平,王国清,郭世海,任江远,王新林.铸态及快淬态La-Mg-Ni系(PuNi_3型)贮氢合金的循环稳定性[J].中国有色金属学报,2005,15(5):705-710. 被引量:9
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  • 4Kadir K, Sakai T, Uehara I. Synthesis and structure determination of a new series of hydrogen storage alloys ; RMg2 Ni9(R=La, Ce, Pr, Nd, Sn and Gd) built from MgNi2 Laves-type layers alternating with AB5 layers [ J ]. J Alloys Comp, 1997, 257:115 - 121.
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  • 6Hongge Pan, Yongfeng Liu, Ming Xia Gao, et al. An investigation on the structural and electrochemical properties of La0.7Mg0.3 ( Ni0.85 Co0. 15 )x ( x = 3. 15 - 3.8 ) hydrogen storage electrode alloys[J]. J Alloys compd, 2003,351:228- 234.
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  • 10刘永锋,应窕,潘洪革.新型稀土镁基贮氢电极合金的结构与性能[J].材料研究学报,2003,17(4):380-388. 被引量:9

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