03.球磨参数及Ni比例对Mg2Ni合金储氢性能影响研究

张国芳¹，许剑轶¹，张胤²，刘卓承¹

（1．内蒙古科技大学材料与冶金学院，内蒙古 包头014010;2.内蒙古科技大学工程训练中心，内蒙古 包头014010）

中图分类号：TG139 文献标识码：A

摘要：采用中频感应炉熔炼出铸态Mg₂Ni合金，将Mg₂Ni合金与一定量的Ni粉进行混合球磨处理。系统研究在不同Ni粉添加量及球磨时间等条件下所得合金样品的结构及储氢性能。研究表明，随着Ni含量的增大及球磨时间的延长，合金的非晶纳米晶结构逐渐增多；合金的最大放电容量及循环稳定性得到明显提升；合金的表面催化活性及合金体相内的H传输能力都有了显著提高。Ni粉的作用主要在于可促进合金非晶化，同时对合金的放氢过程起到了催化的作用。

关键词：Mg₂Ni合金，Ni；球磨；非晶化

Research on the effect of Ni addition and ball milling time on the hydrogen storage properties of Mg₂Ni alloy

ZHANG Guo-fang¹,LIU Zhuo-cheng¹, XV Jian-yi¹, ZHANG Yin²

(Rare Earth school, Inner MongoliaUniversity of Science and Technology, Baotou, 014010, China )

Abstract: As-cast Mg₂Ni alloy was melted in a vacuum mid-frequency induction furnace, then, the ball milling treatment was conducted to the mixture of Mg₂Ni and Ni powders. The hydrogen storage properties of the ball milled alloys prepared under different Ni addition and ball milling time were studied in details. It was showed that the amorphous and nanocrystalline structure of Mg₂Ni alloy was increased by increasing the Ni content and extending the ball milling time；the maximum discharge capacity and cycle stability were improved obviously. Furthermore, the catalytic activity on the surface of Mg₂Ni and the capacity of H transmission were enhanced evidently. The function of Ni powder lies in promoting the amorphization of Mg₂Ni alloy andenhancing the hydrogen desorption ability during the dehydriding process as a kind of catalyst.