碳助磨制备纳米镁铝储氢合金的结构及储氢性能研究  

Microstructure and Hydrogen Storage Properties of Nanostructured Mg-Al Alloy from Reactive Milling with Carbon as Milling Aid

作　　者：张同环[1] 周仕学[1] 牛海丽[1] 肖成柱[2] 王乃飞[1] 

机构地区：[1]山东科技大学化学与环境工程学院,山东青岛266590 [2]日照钢铁控股集团有限公司,山东日照276806

出　　处：《材料工程》2015年第3期48-53,共6页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(21176145;51408347)

摘　　要：以改性无烟煤为助磨剂,在氢气气氛下球磨制备了具有纳米结构的镁铝合金储氢材料,通过SEM,XRD,TPD等手段对比研究了球磨吸氢材料及静态再吸氢材料的晶相结构及放氢动力学性能。结果表明:改性无烟煤具有良好的助磨作用,经5.5h球磨,材料平均粒度可达74nm;镁铝合金经反应球磨后,其中的Mg转化成了β-MgH2和γ-MgH2,放氢峰温低于300℃;静态再吸氢后,MgH2全部以β-MgH2存在,且晶体粒度增长60%,Mg17Al12分解为单质Mg和Al,其中单质Al使储氢材料放氢活化能降低,用Kissinger方程计算出球磨储氢和再吸氢材料的放氢一级表观活化能分别为107.3kJ/mol和67.1kJ/mol。Nanostructured Mg-AI alloy hydrogen storage material was prepared with modified anthra- cite as milling aid by ball milling under hydrogen atmosphere. The crystal phase structure and dehy- drogenation kinetics properties of the ball milled hydrogen absorbing materials and static re-hydrogen- ated materials were analyzed by SEM, XRD and TPD. The results show that the modified anthracite plays a good milling aid role, after 5.5 h of milling, the average particle size of Mg-A1 alloy reaches to 74 nm The Mg in the Mg-A1 alloy transforms intoβ-MgH2 and 7-MgH2 after reaction ball milling, whose peak dehydrogenation temperature is lower than 300 ℃ Yet, after static re-hydrogenation, the MgH2 all exists in β-MgH2 which shows a 60%increase in crystal size, and the Mg17A112 decomposes into elementary Mg and A1. The elementary A1 decreases the dehydrogenation activation energy of hy- drogen storage materials, where the hydrogen level of apparent activation energy of the ball milled hy- drogen storage material and re-hydrogenated material is 107.3kJ/mol and 67. lkJ/tool, respectively, calculated according to the Kissinger equation.

关 键 词：镁铝储氢合金 Kissinger方程 碳助磨剂 动力学性能 活化能 

分 类 号：TG139[一般工业技术—材料科学与工程]