机械合金化Mg/MmNi_(5-x)(CoAlMn)_x复合储氢合金的组织结构与吸氢特性

Microstructure and Hydrogen Absorption Properties of Mg/MmNi_(5-x) (CoAlMn)_x Composite Hydrogen Storage Alloy Prepared by Mechanical Alloying

运用Ｘ射线衍射、扫描电镜及粒度分析等方法表征了机械合金化制备Ｍｇ／ＭｍＮｉ５ － ｘ（ＣｏＡｌＭｎ）ｘ复合储氢合金的结构，通过ＰＣＴ曲线研究了其储氢性能。结果表明，在适当的球磨条件下能够获得纳米晶结构的Ｍｇ／ＭｍＮｉ５－ ｘ（ＣｏＡｌＭｎ） ｘ 复合储氢合金，与ＭｍＮｉ５－ ｘ（ＣｏＡｌＭｎ）ｘ 合金相比，复合储氢合金的活化性能及储氢量有明显提高。此外，还考察了Ｍｇ 含量对复合储氢合金的组织结构及储氢性能的影响。

The microstructure of the Mg/MmNi 5-x (CoAlMn) x composite hydrogen storage material prepared by mechanical alloying was characterized by X ray diffraction, SEM and particle size distribution analysis. The hydrogen absorption properties of the composite was also evaluated by measuring PCT curves. The results show that nanocrystalline composite structure can be obtained under adequate ball milling condition. The reactive activation and hydrogen absorption capacity are improved in comparison with the sole MmNi 5-x (CoAlMn) x alloy. The influence of magnesium on the microstructure and hydrogen absorption properties of the composite was also evaluated.