Preparation of an additive-free sample with a MgH₂ phase by planetary ball milling of Mg with10 wt% MgH₂

详细信息    查看全文

• 作者：Seong-Hyeon Hong ; Myoung Youp Song
• 关键词：hydrogen absorbing materials ; mechanical alloying/milling ; hydrogen ; X ; ray diffraction ; an additive(s) ; free MgH2 sample
• 刊名：Metals and Materials International
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：22
• 期：6
• 页码：1121-1128
• 全文大小：1,054 KB
• 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
• 卷排序：22

文摘

In order to prepare an additive-free sample with a MgH₂ phase, 90 wt% Mg+10 wt% MgH₂ (named Mg-10MgH₂) was milled under hydrogen atmosphere in a planetary ball mill for different durations (2 h, 5 h, and 10 h). The hydrogen absorption and release properties of the prepared samples were investigated and compared with those of purchased pure MgH₂ samples. Mg-10MgH₂ milled for 5 h had the largest quantity of hydrogen released at 648 K for 100 min of 5.96 wt%. Mg-10MgH₂ milled for 5 h released 0.11 wt% H for 10 min, 4.85 wt% H for 30 min, and 5.83 wt% H for 60 min at 648 K at the first cycle. Mg-10MgH₂ milled for 5 h absorbed 5.39 wt% H for 5 min and 5.92 wt% H for 60 min at 648 K at the second cycle. Dehydriding curves were also obtained at the first cycle of Mg-10MgH₂ samples milled for 5 h using Mg powder with or without sieving (200 mesh). The dehydriding curve at 648 K of a Mg-10MgH₂ sample milled for 5 h in the planetary ball mill was compared with that of the sample milled for 24 h in a horizontal ball mill.