摘要
为了改善Mg2Ni型合金的电化学贮氢性能,用Co部分替代合金中的Ni。用快淬工艺制备了纳米晶和非晶Mg20Ni10-xCox(x=0、1、2、3、4)贮氢合金,分析了铸态及快淬态合金的微观结构,测试了合金的电化学贮氢性能。研究了Co替代Ni及快淬工艺对合金电化学贮氢性能的影响。结果表明,Co替代Ni不改变合金的Mg2Ni主相,但形成了第二相MgCo2。在快淬(x=0)合金中没有发现非晶相,但快淬(x=4)合金显示了纳米晶、非晶结构,表明Co替代Ni提高了Mg2Ni型合金的非晶形成能力。熔体快淬显著的改善了合金的电化学贮氢性能,合金放电容量和电化学循环稳定性均随淬速的增加而增加。
In order to improve the electrochemical hydrogen storage characteristics of the Mg2Ni-type alloys, Ni in the alloy was partially substituted by element Co. The nanocrystalline and amorphous Mg20Ni10-xCox（x=0, 1, 2, 3, 4） alloys were prepared by melt-spinning technology. The structures of the as-cast and spun alloys were analyzed. The electrochemical hydrogen storage performances of the alloys were measured. The influences of substituting Ni with Co and melt spinning on the electrochemical hydrogen storage characteristics of the alloys were investigated. The results showed that the substitution of Co for Ni did not change the major phase of Mg2Ni in the alloy, but it led to secondary phase MgCo2 formed. Without amorphous phase formed in the asspun （x=0） alloy, .but the as-spun （x=4） alloy showed nanocrystalline and amorphous structure, indicating that the substitution of Co for Ni enhances the glass forming ability of Mg2 Ni-type alloy. The melt spinning significantly improved the electrochemical hydrogen storage characteristics of the alloys. The discharge capacity and cycle stability of the alloys increased with rising spinning rate.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2009年第9期1537-1540,1544,共5页
Journal of Functional Materials
基金
国家高技术研究发展计划(863计划)资助项目(2006AA05Z132)
国家自然科学基金资助项目(50871050
50701011)
内蒙古自然科学基金重点资助项目(200711020703)
内蒙古高等教育科学研究资助项目(NJZy08071)
关键词
MG2NI型合金
快淬
微观结构
电化学贮氢
Mg2 Ni-type alloy
melt-spinning
structure
electrochemical hydrogen storage
