高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (10): 1877-1880.

• 研究论文 • 上一篇    下一篇

Mg1.75Al0.25Ni1-xCrx(0 ≤x≤ 0.2)合金的制备及其性能

王美涵1, 张连中1, 孙立贤1, 张耀1, 徐芬1, 谭志诚1, 袁华堂2, 张涛1   

  1. 中国科学院大连化学物理研究所材料热化学实验室, 中国科学院大连化学物理研究所材料热化学实验室 大连116023, 大连116023, 南开大学新能源材料化学研究所, 天津300071
  • 收稿日期:2004-11-18 出版日期:2005-10-10 发布日期:2005-10-10
  • 基金资助:

    国家自然科学基金(批准号:20473091)资助.

Preparation and Properties of Mg1.75Al0.25Ni1-xCrx(0 ≤x≤ 0.2) Alloys

WANG Mei-Han1, ZHANG Lian-Zhong1, SUN Li-Xian1, ZHANG Yao1, XU Fen1, TAN Zhi-Cheng1, YUAN Hua-Tang2, ZHANG Tao1   

  1. 1. Material and Thermochemistry Laboratory,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;
    2. Institute of New Energy Material Chemistry,Nankai University,Tianjin 300071,China
  • Received:2004-11-18 Online:2005-10-10 Published:2005-10-10

摘要: 用扩散烧结法制备了Mg1.75Al0.25Ni1-xCrx(0≤x≤0.2)系列合金.XRD结构分析表明,用Cr部分替代Mg1.75Al0.25N i中的N i,合金的晶体结构并不发生改变,主相为具有立方Ti2Ni结构的Mg3AlNi2相,只是其晶格常数a变大.Cr的替代提高了合金的放电容量,经过一个充放电循环后达到最大值.当x为0.1时,有利于提高合金电极的循环稳定性.测试4种合金阳极极化曲线发现,其腐蚀电位由正到负的顺序为Mg1.75Al0.25Ni0.9Cr0.1>Mg1.75Al0.25N i>Mg1.75Al0.25Ni0.8Cr0.2>Mg2N i,说明Mg1.75Al0.25Ni0.9Cr0.1合金具有相对较好的抗腐蚀性.该系列合金循环稳定性结果也支持这一结论.用球磨方法改变合金性能,发现合金的相组成和相结构在球磨后均发生了变化,合金不再需要活化过程,但其放电容量并没有得到提高.

关键词: 镁基储氢合金, 元素取代, 电极材料

Abstract: Mg1.75Al0.25Ni1-xCrx(0 ≤x≤ 0.2) alloys were synthesized by diffusing method(DM) on the basis of the ternary Mg1.75Al0.25Ni alloy.The X-ray diffraction showed that the structure of the Cr-partially-substituted alloy did not differ from that of Mg1.75Al0.25Ni alloy but there was a change in the lattice parameter.It was found that the Cr-substituted alloys showed enhanced discharge capacities.The cycle life of the alloys was(improved) when x(Cr) reached 0.1. The anti-corrosion order was Mg1.75Al0.25Ni0.9Cr0.1>Mg1.75Al0.25Ni>Mg1.75Al0.25Ni0.8Cr0.2>Mg2Ni.The result of the charge-discharge experiment also supported the conclusion.The structure and the component of alloy phase were changed after ball milling but the discharge capacity of the Mg1.75Al0.25Ni0.9Cr0.1 alloy was not enhanced.

Key words: Mg-based hydrogen storage alloys, Elements substitution, Electrode materials

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