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270h,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。
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.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2008年第1期42-47,共6页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金(50574105)
湖南省自然科学基金(05JJ30096)
教育部新世纪优秀人才支持计划(2006年)
中南大学粉末冶金研究院院长基金
关键词
储氢材料
机械合金化
燃料电池
纳米材料
hydrogen storage material
mechanical alloying
fuel cell
nanostructured materials
