快淬工艺对La0.7Mg0.3Ni2.55-xCo0.45Alx(x=0～0.4)电极合金微观结构及电化学性能的影响

稀有金属材料与工程, 2007, 36(8): 1431-1435.

快淬工艺对La0.7Mg0.3Ni2.55-xCo0.45Alx(x=0～0.4)电极合金微观结构及电化学性能的影响

张羊换 ^1, , 任慧平 ^2, , 吴忠旺 ^3, , 董小平 ^4, , 郭世海 ^5, , 王新林 ^6,

1.内蒙古科技大学,内蒙古,包头,014010;钢铁研究总院,功能材料研究所,北京,100081

2.内蒙古科技大学,内蒙古,包头,014010

3.内蒙古科技大学,内蒙古,包头,014010

4.钢铁研究总院,功能材料研究所,北京,100081;北京科技大学,北京,100083

5.钢铁研究总院,功能材料研究所,北京,100081

6.钢铁研究总院,功能材料研究所,北京,100081

基金项目: 内蒙古高等学校科研项目(NJ05064) 国家自然科学基金(50642033) 内蒙古科技计划(20050205)

关键词： La-Mg-Ni系电极合金 , Al替代Ni , 快淬 , 微观结构 , 电化学性能

Effects of Rapid Quenching on the Microstructures and Electrochemical Performances of La0.7Mg0.3Ni2.55-xCo0.45Alx (x = 0～0.4) Alloys for Electrodes

用铸造及快淬工艺制备了La-Mg-Ni系(PuNi3型)电极合金La0.7Mg0.3Ni2 55-xCo0.45Alx(x=0,0.1,0.2,0.3,0.4),研究了快淬工艺对合金微观结构及电化学性能的影响.XRD分析结果表明,铸态及快淬态合金具有多相结构,包括(La,Mg)Ni3相和LaNi5相和一定量的LaNi2相,快淬处理对合金的相组成没有影响,但使相的相对含量产生变化.TEM及SEM分析结果表明,快淬处理显著改善合金的成分均匀性,使晶粒细化.Al替代Ni不利于非晶相的形成,但使快淬态合金的晶粒显著细化.电化学测试结果表明,快淬处理显著提高合金的循环稳定性,但不同程度地降低合金的放电容量和活化性能,快淬对放电电压特性的影响是复杂的.

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