摘要
采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、差热分析(DTA)等方法研究了高能球磨及热处理等对新型合金LaNi5 34%(质量分数)Mg的相组成、形貌及热稳定性能等的影响。结果表明:经100r/min球磨100h及190r/min球磨100h后,样品由La、Mg、Ni等非晶,微量的晶体Ni和MgNi2相组成,所得粉末的形状大多为规则的球形或近球形,其颗粒直径范围为0.05～33.0μm。球磨样品具有较好的室温活化特性,其最大电化学放电容量为460mAh/g。该样品经763K保温35d后,得到热稳定性较好的具有纳米尺度的MgNi2、Mg2Ni、Mg2NiLa三相组织,其平均晶粒直径为21.3nm。
The compositional and structural characteristics of the novel LaNi_5-34wt%Mg alloy prepared by high energy ball milling were investigated by means of the X-ray diffraction (XRD), scanning electron microscope (SEM), differential thermal analysis (DTA). The results showed that besides small amounts of Ni and MgNi_2 phases, the amorphous structure of La, Mg and Ni can be obtained after ball milling for 100h at 100r/min and 100h at 190r/min, and shape of the particles were spheroid or sphere, the size of the particles were 0.05～33.0μm. The alloy reached its maximum discharge capacity (460mAh/g) after first charge/discharge cycling at room temperature. After heat treated for 35d at 763K, the novel LaNi_5-34wt%Mg alloy was stable and was consisted of (Mg_2NiLa),Mg_2Ni,MgNi_2 phases with the average grain size of 21.3nm.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2004年第2期177-179,182,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(5017024)
广西自然科学基金资助项目(0135053)
关键词
贮氢合金
活化性能
高能球磨
相组成
热稳定性
XRD
SEM
差热分析
hydrogen storage alloy
activation characteristics
high energy ball milling
phase composition
thermal stability
