摘要
用X射线和电镜(SEM和TEM)研究了高能球磨工艺对Mg2Ni贮氢合金纳米粉形成的影响。结果表明:球磨时间延长,振动频率提高和球料比的增大可有效地降低合金粉的晶粒尺寸。振动频率为25Hz条件下,不锈钢磨罐球磨1h后,合金粉的晶粒尺寸达到48.1nm。在球料比为5.85∶1,振动频率分别为20和30Hz的条件下,经4h球磨后不锈钢磨罐中粉末晶粒度为36.7和26.4nm。对球磨过程进行的理论模拟计算表明,增加球料比主要是通过加大单次碰撞粉末体获得的应变来缩短球磨时间;而提高振动频率,对单次碰撞粉末体获得的应变影响不大。
The effect of parameters of the high-energy ball milling on the formation of MgzNi powder as hydrogen storage alloy was studied via X-ray diffraction （XRD） and Electron Microscope （SEM and TEM）. The results show that the increase of the milling time, the vibration frequency and the charge ratio can effectively decrease the grain size of the alloy powder. The powder grain size can reach 48. lnm after 1 h, 25Hz milling in the stainless ball. At the charge ratio of 5.85 ： 1 when the vibration frequency of 20 and 30Hz, the powder grain size in the stainless steel container is 36.7 and 26.4nm after 4h milling, respectively. Theoretical Calculation shows that the reduce of the milling time is mainly due to the increase of the strain of every collusion when increasing the charge ratio, while increasing the vibration frequency have little effect on the strain of every collusion.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2006年第8期1338-1340,1344,共4页
Journal of Functional Materials
基金
中国工程物理研究院基金资助项目(20040870)
关键词
高能球磨
贮氢合金
MG2NI
high-energy-milling
hydrogen storage alloy
Mg2 Ni
