((1. 中南大學 粉末冶金國家重點實驗室，長沙 410083；2. Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1；3. 萊鋼集團粉末冶金有限公司，萊蕪 271105))
摘 要: 分別應用Uni−Ball−Mill 5和XQM−4變頻行星式球磨機將Mg粉和Fe粉在氫氣中直接球磨合成三元儲氫相Mg2FeH6。采用球磨罐中的氫壓降、X射線衍射譜、掃描電鏡、熱分析、吸放氫測試等測試手段研究了不同球磨方式對納米晶Mg2FeH6儲氫材料的合成結果。結果表明，XQM−4變頻行星式球磨機球磨150 h，Mg2FeH6相的產率(質量分數(shù))接近70%；在100 kPa氫壓下，380 ℃放氫量為2.66%，粉末呈片狀，晶粒在7 nm以下。而采用Uni−Ball−Mill 5球磨機P2方式球磨270 h，Mg2FeH6相的產率僅為39.1%，100 kPa氧壓下，350 ℃放氫量為1.15%，粉末呈球狀。兩者的差別可能源于前一種球磨方式具有更高的球磨合金化效率。
關鍵字: 儲氫材料；機械合金化；燃料電池；納米材料
（(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
