Preparation of a sample with a single MgH2 phase by horizontal ball milling and the first hydriding reaction of 90 wt% Mg-10 wt% MgH2

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• 作者：Seong-Hyeon Hong (1)
  Myoung Youp Song (2)
  
  1. Small and Medium Sized Corporate Supporting Department ; Korea Institute of Materials and Science (KIMS) ; Affiliated with Korea Institute of Machinery and Materials ; 797 Changwon-daero Seongsan-gu ; Changwon ; Gyeonsangnam-do ; 642-831 ; Korea
  2. 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
  
• 关键词：hydrogen absorbing materials ; mechanical alloying/milling ; microstructure ; X ; ray diffraction ; a single MgH2 phase
• 刊名：Metals and Materials International
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：21
• 期：2
• 页码：422-428
• 全文大小：1,203 KB
• 参考文献：1. Song, M. Y., Kwak, Y. J., Lee, S. H., Park, H. R. (2013) Korean J. Met. Mater. 51: pp. 671
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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 order to prepare an additive-free sample with a single MgH2 phase, 90 wt% Mg-10 wt% MgH2 (named 90Mg-10MgH2) was milled under a hydrogen atmosphere in a horizontal ball mill, and then hydrided. The hydrogen absorption and desorption properties of the prepared samples were investigated, and compared with those of milled pure Mg and purchased MgH2. X-ray diffraction analysis, measurement of specific BET surface areas, and observation of the prepared samples by scanning electron microscope were performed. The 90Mg-10MgH2 sample after hydriding-dehydriding cycling had small and large particles with fine particles on their surfaces, and had much finer particles and more defects than the milled pure Mg sample after hydridingdehydriding cycling. The specific BET surface areas of the milled Mg and 90Mg-10MgH2 were measured as 7.81 and 99.81 m2/g, respectively. A sample that had almost a single MgH2 phase could be prepared by horizontal ball milling and the first hydriding reaction of 90Mg-10MgH2. 90Mg-10MgH2 released 5.82 wt% H for about 70 min, while unmilled MgH2 (Aldrich) released 6.04 wt% H for about 100 min, at 648 K.