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The Fabrication of MggTi1-(10, 20 wt%)Ni Hydrogen Absorbing Alloys by Hydrogen Induced Mechanical Alloying and Evaluation of Hydrogenation Properties(Part II : Evaluation of Pressure-Composition-Isotherm Properties)  

Hong, Tae-Whan (Dept. of Mater. Sci. & Eng., Chungju National Univ.)
Kim, Gyeong-Bum (Dept. of Mechanical Design, Chungju National Univ.)
Kim, Yeong-Jig (Dept. of Advanced Materials Eng., Sungkyunkwan Univ.)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.13, no.4, 2002 , pp. 270-278 More about this Journal
Abstract
Mg and Mg alloys are attractive hydrogen storage materials because of their lightweight and high absorption capacity. Their range of applications could be further extended if their hydrogenation properties and degradation behavior could be improved, The main emphasis of this study was to find an economic manufacturing method for Mg-Ti-Ni-H systems, and to investigate their hydrogenation properties, In order to examine hydrogenation behavior, a Sieverts type automatic pressure-composition-isotherm(PCI) apparatus was used and the experiments were performed at 423, 473, 523, 573, 623 and 673K. The results of thermogravimetric analysis(TGA) reveal that the absorbed hydrogen contents are around 2.5 wt% for ($Mg_9Ti_1$)-10 wt% Ni. With increased Ni content, the absorbed hydrogen content decreases to 1.7 wt%, whereas the dehydriding starting temperatures are lowered by some 70-100K. The results of PCI on ($Mg_9Ti_1$)-20 wt% Ni show that its hydrogen capacity is around 5.3 wt% and its reversible capacity and plateau pressure are also excellent at 523K and 573K. In addition, the reaction enthalpy, $\Delta$HD.plateau, is $30.6{\pm}5.7kJ/molH_2$.
Keywords
Mg-Ti-Ni-H systems; Hydrogenation properties; Pressure-Composition-Isotherm; PCI; Thermogravimetric analysis; TGA; Reaction enthalpy;
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