Hydrogen storage properties of Mg-23.5Ni-xCu prepared by rapid solidification process and crystallization heat treatment
✍ Scribed by Seong-Hyeon Hong; Jong-Soo Bae; Sung Nam Kwon; Myoung Youp Song
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 678 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0360-3199
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✦ Synopsis
Crystallization heat treatment 5 and 7.5) alloys Hydriding and dehydriding rates a b s t r a c t A Mg-23.5wt%Ni-5wt%Cu alloy was synthesized by the gravity casting method in a large quantity (7.5 kg). From this alloy, Mg-23.5wt%Ni-xwt%Cu (x ¼ 2.5, 5 and 7.5) samples for hydrogen storage were prepared by melt spinning and crystallization heat treatment. The samples were ground under H 2 in order to obtain a fine powder. These alloys contained crystalline Mg and Mg 2 Ni phases. The Mg-23.5Ni-2.5Cu alloy had the highest hydriding and dehydriding rates after activation among these alloys. The dehydriding curve under 1.0 bar H 2 at 573 K exhibits two stages; the dehydriding rate is high for about 2.5 min (the decomposition of Mg 2 Ni hydride and Mg hydride in small particles), and then it becomes lower (the decomposition of Mg hydride).