((1. 中南大学 粉末冶金国家重点实验室，长沙 410083；2. Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1；3. 莱钢集团粉末冶金有限公司，莱芜 271105))
摘 要: 分别应用Uni−Ball−Mill 5和XQM−4变频行星式球磨机将Mg粉和Fe粉在氢气中直接球磨合成三元储氢相Mg2FeH6。采用球磨罐中的氢压降、X射线衍射谱、扫描电镜、热分析、吸放氢测试等测试手段研究了不同球磨方式对纳米晶Mg2FeH6储氢材料的合成结果。结果表明，XQM−4变频行星式球磨机球磨150 h，Mg2FeH6相的产率(质量分数)接近70%；在100 kPa氢压下，380 ℃放氢量为2.66%，粉末呈片状，晶粒在7 nm以下。而采用Uni−Ball−Mill 5球磨机P2方式球磨270 h，Mg2FeH6相的产率仅为39.1%，100 kPa氧压下，350 ℃放氢量为1.15%，粉末呈球状。两者的差别可能源于前一种球磨方式具有更高的球磨合金化效率。
关键字: 储氢材料；机械合金化；燃料电池；纳米材料
（(1. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;2. Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1;3. Powder Metallurgy Corporation Ltd, Laiwu Iron and Steel Group, Laiwu, Shandong 271105, China)）
Abstract:A Uni−Ball−Mill 5 and an XQM−4 type planetary ball mill were adopted respectively in order to compare effects of milling methods on synthesis of Mg2FeH6 hydrogen storage materials. Hydrogen pressure loss, X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermoanalysis were conducted to determine the structure and performance of the milled powders. The results show that the powder milled in XQM-4 type planetary ball mill for 150 h yields 70% of Mg2FeH6 phase and can release about 2.66% of hydrogen, desorp at 380 ℃ and 100 kPa , the powders have flake shapes and grain sizes below 7 nm. Whereas, the powders milled in Uni−Ball−Mill 5 with process P2 for 270 h have lower yield of Mg2FeH6 phase, only 39.1%, desorp 1.15% at 350 ℃ and 100 kPa, and show spherical shape. The difference may be attributed to the fact that the planetary ball mill has higher milling efficient than the Uni−Ball−Mill 5.
Key words: hydrogen storage material; mechanical alloying; fuel cell; nanostructured materials
