机械合金化制备Mg76-xTi12＋xNi9Cr3(x=4,8,12,16)合金贮氢性能的研究  

Hydrogen Storage Properties of Mg_(76-x)Ti_(12+x)Ni_9Cr_3(x=4,8,12,16) Alloys by Mechanical Alloying

作　　者：蓝志强[1] 李书波[1] 卢照[1] 高召习[1] 郭进[1] 

机构地区：[1]广西大学物理科学与工程技术学院,有色金属及材料加工新技术教育部重点实验室,广西南宁530004

出　　处：《稀有金属》2011年第4期498-503,共6页Chinese Journal of Rare Metals

基　　金：国家自然科学基金(50561002,50861003);广西自然科学基金重点项目(2010GXNSFD013004);有色金属及材料加工新技术教育部重点实验室开放基金(GXKFJ-04);广西大学拔尖创新团队建设计划项目资助

摘　　要：采用机械合金化制备Mg76-xTi12＋xNi9Cr3（x=4,8,12,16）合金,通过X射线衍射（XRD）、热分析（DSC）、扫描电子显微镜（SEM）和压强-成分-温度（PCT）分析等方法对合金进行分析和表征。结果表明：Mg76-xTi12＋xNi9Cr3（x=4,8,12,16）合金相主要由Mg2Ni相和Ti2Ni相组成,随着球磨时间的增加,合金得到明显的细化且非晶化程度提高。Mg76-xTi12＋xNi9Cr3（x=4,8,12,16）合金经过20~80 h球磨后,其贮氢量分别从3.93%,3.82%,3.64%和2.81%下降到2.36%,2.16%,1.81%和2.0%;合金经过活化后,在80 s内吸氢趋于饱和,显示合金良好的吸氢速率。随着Ti/Cr比例的增大以及球磨时间的增加,合金的吸氢速率下降,经过40 h球磨后Mg76-xTi12＋xNi9Cr3（x=4,8,12,16）合金氢化物的释氢温度分别为277,255,245和233℃,释氢温度随着Ti含量的增加而降低。Mg76-xTi12＋xNi9Cr3（x=4,8,12,16） alloys were synthesized by mechanical alloying（MA） process,and the phase structures and hydrogen storage properties of the alloys were investigated by X-ray diffraction,scanning electron microscope,thermal analysis and pressure-composition isotherm measurement.The results showed that the main phases of Mg76-xTi12＋xNi9Cr3（x=4,8,12,16） alloys were comprised of Mg2Ni and Ti2Ni phase,both the degree of amorphous and the solid solubility of the alloys increased with the milling time.When milled from 20 to 80 h,the hydrogen storage capacities of the Mg76-xTi12＋xNi9Cr3（x=4,8,12,16） alloys were reduced from 2.36%,2.16%,1.81% and 2.0% to 3.93%,3.82%,3.64% and 2.81%（mass fraction）,respectively.After activated,the alloys absorbing hydrogen tended to saturate in 80 s.With the milling time and the ratio of Ti/Cr increasing,the hydrogen absorption rates of the alloys slowed down.After milled for 40 h,the hydrogen desorption temperature of the Mg76-xTi12＋xNi9Cr3（x=4,8,12,16） hydride was 277,255,245 and 233 ℃,respectively,indicating the increase of Ti content can reduce the hydrogen desorption temperature.

关 键 词：Mg-Ti合金 贮氢性能 机械合金化 

分 类 号：TG139.7[一般工业技术—材料科学与工程]