| Title |
Fabrication of Mg - Ni Hydrogen Absorbing Alloy by Rotation - Cylinder Method and Evaluation of their Hydrogenation Properties |
| Authors |
하원(Won Ha),홍태환(Tae Whan Hong),김명균(Myoung Gyun Kim),김세광(Shae Kwang Kim),김영직(Young Jig Kim) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Abstract |
Mg -1, 5, 10 mass%Ni hydrogen absorbing alloys were fabricated by Rotation-Cylinder Method(RCM) and their hydrogenation properties were evaluated by PCI(Pressure-Composition Isotherm) measurement. The microstructure of as-cast Mg-10mass%Ni alloy is consisted of an island-like hydride forming α-Mg phase and the eutectic phase. The composition of the eutectic phase is measured about 80 mass%Mg and 20 mass%Ni by EPMA. Nickel has a catalytic effect on hydrogen dissociated reaction and the eutectic phase is rich in nickel composition compared with a phase. So the eutectic phase may act as a hydrogen dissociation site and a channel of diffusion of protium. This microstructure may promote the hydrogenation behaviors. The results of the maximum hydrogen storage capacity and reversible capacity of Mg-10 mass%Ni alloy were measured about 6.3 mass% and 4 mass% at 623K, respectively. |