| Summary: | 碩士 === 國立臺灣海洋大學 === 材料工程研究所 === 101 === In this study, alloy powder of Mg40Al60 and Mg70Al30 by ball milling after 3 hours, and then the alloy powder of Mg40Al60 and Mg70Al30 are to add other elements hydrogen storage performance testing. The results show that, Mg40Al60 alloy powder wasn’t form β phase but only Mg solid solution and Al solid solution after milled for 3 hours.After heat treatment, will receive β equilibrium phase, but there are still remnants of the Mg phase.
On the hydrogen storage performance, alloy powder of Mg40Al60 the hydrogen content is 1.15wt%. The results prove that β phase hydrogen charging effect is not obvious, but also failed to reach the theoretical value of hydrogen charging, hydrogen charging recycle theoretical value of γ phase is better relative to the experiment. Add other elements into Mg70Al30, the hydrogen absorption / desorption tests found its hydrogen storage capacity than Mg40Al60. Ni elements are added to the Mg40Al60 hydrogen storage capacity from 1.15wt% (No Ni) increased to 1.25wt% (add Ni). Mg70Al30 hydrogen increased from 2.80wt% (No Ni) increased to 3.22wt% (add Ni). Increasing Ni content also helps the hydrogen storage capacity improved. Alloy powder of Mg70Al30 added Ag, V, and Sn elements, hydrogen absorption capacity was 3.07 wt%, 3.09 wt% and 3.24 wt%, add other elements also help γ phase hydrogen effect. But for Mg40Al60 alloy powder addition Sn, Ag and V elements, hydrogen storage capacities were 0.19 wt%, 0.22 wt% and 0.32 wt%, relative to the β phase is obviously not helpful.
Alloy powder of Mg-Al with or without added element after hydrogen release at no residual MgH2 phase of this case to prove that the system of hydrogen absorption and desorption reactions as a reusable reversible hydrogen storage materials. Adding different elements in Mg-Al alloy powder can affect the charge and the amount of hydrogen in the hydrogen-absorbing powders.
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