球磨改性处理对Ti_(0.9)Zr_(0.1)Mn_(1.5)合金相结构及储氢性能的影响

Effect of Ball-Milling on the Phase Structure and Hydrogen Storage Properties of Ti_(0.9)Zr_(0.1)Mn_(1.5)Alloy

系统研究了Ti0.9Zr0.1Mn1.5储氢合金经不同时间(t=0min,10min,30min,60min)球磨改性处理后对其相结构及储氢性能的影响。结构分析表明,Ti0.9Zr0.1Mn1.5合金在球磨改性处理前后均由单一的六方结构的C14型Laves相组成;随着球磨时间的延长,合金粉的平均粒度减小,并出现了部分团聚现象。储氢性能测试表明,铸态合金经4次吸放氢循环后活化,室温最大吸氢量和有效放氢量分别为209.3ml/g和157.6ml/g,放氢率为75.3%;随着球磨时间的延长,合金的活化性能得到改善,室温最大吸氢量和有效放氢量均先升后降,且都在球磨30min时达到相应最高值231.4ml/g和203.8ml/g,放氢率达到88.1%。由此可见,适当的球磨改性处理能有效地改善Ti0.9Zr0.1Mn1.5合金的综合储氢性能。

The changes in phase structure and hydrogen storage properties of Ti0.9Zr0.1Mn1.5 alloy after modification by mechanical ball-milling for different time （t = 0 min, 10 min, 30 min, 60 min） were investigated systematically. The XRD and SEM analysis show that all of the as-cast and ball-milled alloys consist of a single C14 type Laves phase with hexagonal structure. The ball-milled alloy powders appear aggregation to some extent, the particle size decreases and the activation behaviour is improved with the increase of ball-milling time for the alloy. It is found that the as-cast alloy is activated after 4 hydriding/dehydriding cycles, and its maximum hydrogen absorption capacity and effective hydrogen desorption capacity at room temperature are 209.3 ml/g and 157.6 ml/g, respectively, and the efficiency of hydrogen desorption/absorption is 75.3%. The maximum hydrogen absorption capacity and the effective hydrogen desorption capacity increase firstly then decrease at room temperature with the maximum values of 231.4 ml/g and 203.8 ml/g at t=-30 min, respectively, while, its efficiency of hydrogen desorption/absorption reaches 88.1%. This shows that the overall properties of Ti0.9Zr0.1Mn1.5 alloy can be improved effectively by ball-milling.