摘要
采用真空悬浮熔炼炉制备了Mg79YNi20和Mg77Y3Ni20两种镁基合金,系统研究了Y含量对合金结构和储氢性能的影响.结果表明,Y含量的增加显著改善了合金的吸放氢动力学,尤其是快速吸氢性能。随Y含量的增大,合金的放氢温度从567K降低到485K.将等温下吸氢量随压力变化(PCI)的数据带入Van’t hoff方程,计算得出的焓变和熵变显示,Y替代量加量的增加有效降低了合金的热力学稳定性.
The Mg-based Mg79 YNiz0 and Mg77 Ya Niz0 alloys were prepared by vacuum induction levitation melting furnace. Effect of Y substitution on the structure and gaseous hydrogen storage performance of the alloys was investigated. The results show that increasing Y content can improve hydrogen absorption kinetics,especially for fast hydrogenation of the alloys. Furthermore,increasing Y substitution lowers the initial dehydrogenation temperature from 567K to 485K. Enthalpy change of the alloys decreasing with the increasing Y substitu- tion indicates that the thermal stability of the alloys has been reduced.
作者
李永治
胡锋
罗龙
赵增武
张羊换
赵栋梁
LI Yong-zhi;HU Feng;LUO Longz;ZHAO Zeng-wu;ZHANG Yang-huan;ZHAO Dong-liang(Department of Functional Material Research,Central Iron and Steel Research Institute,Beij ing 100081,China;Key Laboratory of Integrated Exploitation Inner Mongolia University of Science and of Baiyun Obo Multi-Metal Resources,Technology,Baotou 014010,China)
出处
《内蒙古大学学报(自然科学版)》
CAS
北大核心
2018年第6期651-656,共6页
Journal of Inner Mongolia University:Natural Science Edition
基金
国家自然科学基金资助项目(51761032)
内蒙古自治区自然科学基金资助项目(2018LH05010)
关键词
储氢
MgYNi合金
快速吸氢
焓变
熵变
Hydrogen storage
MgYNi alloy
fast hydrogen charging
enthalpychange
entropy change