| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 98 === The objectives of this work are to further enhance the hydrogen properties of Mg-23.5Ni eutectic alloy, and to investigate the impact of catalysts and milling time on the hydrogen storage properties.
Mg23.5Ni eutectic alloy, as raw material, was produced by conventional melting. Phases and chemical compositions were evaluated by XRD and EPMA. The results show that the phases and chemical composition of as-prepared Mg23.5Ni is nearly the same with theoretical composition. Mg23.5Ni+5wt% x-catalysts (x= C(Pd), Nb2O5, Y2O3) alloys were synthesized by using high-energy SPEX 8000 shaker mill. The effects of mechanical milling and x-catalysts (x= C(Pd), Nb2O5, Y2O3) on the hydriding and dehydriding properties of Mg23.5Ni eutectic alloys are discussed. It was found that C(Pd) is more effective than the others catalysts in improving the hydriding-dehydriding properties of Mg23.5Ni eutectic alloy as well as decreasing the absorption enthalpy.
The decreasing of particle size leads to improving in the hydrogen absorption-desorption rate and is decreasing the absorption enthalpy of Mg23.5Ni eutectic alloy. It shows that the decreasing of absorption enthalpy has directly relation to increasing the hydrogen absorption rate of Mg23.5Ni eutectic alloy.
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