Hydriding and dehydriding rates of Mg, Mg-10TaF5, and Mg-10NbF5 prepared via reactive mechanical grinding

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• 作者：Myoung Youp Song (1)
  Young Jun Kwak (2)
  Seong Ho Lee (2)
  Hye Ryoung Park (3)
  
  1. Division of Advanced Materials Engineering ; Research Center of Advanced Materials Development ; Engineering Research Institute ; Chonbuk National University ; 567 Baekje-daero Deokjin-gu ; Jeonju ; 561-756 ; Korea
  2. Department of Materials Engineering ; Graduate School ; Chonbuk National University ; 567 Baekje-daero Deokjin-gu ; Jeonju ; 561-756 ; Korea
  3. School of Applied Chemical Engineering ; Chonnam National University ; 77 Yongbong-ro Buk-gu ; Gwangju ; 500-757 ; Korea
  
• 关键词：hydrogen absorbing materials ; mechanical alloying/milling ; microstructure ; X ; ray diffraction ; Mg ; 10 wt% TaF5 and Mg ; 10 wt% NbF5
• 刊名：Metals and Materials International
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：21
• 期：1
• 页码：208-212
• 全文大小：765 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Metallic Materials
  Operating Procedures and Materials Treatment
  
• 出版者：The Korean Institute of Metals and Materials, co-published with Springer Netherlands
• ISSN：2005-4149

文摘

In this work, TaF5 and NbF5 were chosen as additives to enhance the hydriding and dehydriding rates of Mg. Mg, Mg-10TaF5, and Mg-10NbF5 samples were prepared by reactive mechanical grinding. The hydriding and dehydriding properties of the samples were then examined. Mg-10TaF5 had the largest amount of hydrogen absorbed for 30 min and the highest initial dehydriding rate after incubation period, followed in order by Mg-10NbF5, and Mg. At 593 K under 12 bar H2 at the first cycle, Mg-10TaF5 absorbed 3.63 wt% H for 5 min and 4.53 wt% H for 30 min. At 593 K under 1.0 bar H2 at the first cycle, Mg-10TaF5 desorbed 0 wt% H for 2.5 min, 0.59 wt% H for 5 min, 3.42 wt% H for 30 min, and 4.24 wt% H for 60 min. The reactive mechanical grinding of Mg with TaF5 or NbF5 is believed to have facilitated the nucleation and to have decreased the diffusion distances of hydrogen atoms. These two effects are believed to have increased the hydriding and dehydriding rates of Mg. The MgF2 and Ta2H formed in Mg-10TaF5, and the MgF2, NbH2, and NbF3 formed in Mg-10NbF5 are considered to have enhanced both of these effects.