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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/3151


    Title: Ni添加對Mg17Al12合金吸放氫性質影響之研究;The effect of Ni addition on hydrogen storage properties of Mg17Al12 alloy
    Authors: 翁加旺;Chia-wang Weng
    Contributors: 機械工程研究所
    Keywords: Mg17Al12;Ni;XRD;儲放氫特性;Mg17Al12;Ni;XRD;PCI;Hydrogen storage alloys
    Date: 2009-07-09
    Issue Date: 2009-09-21 12:07:00 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract:   本研究利用鑄造法結合退火熱處理製備高純度Mg17Al12合金,再利用球磨法製備出Mg17Al12+X wt.% Ni (X=0,10,20)合金,並透過充分活化與PCI測試,以研究該合金之吸放氫性質,期望藉由Ni的添加,以催化Mg17Al12合金,降低合金之吸放氫溫度並改善其吸放氫動力學。   由活化測試與吸放氫速率測試得知,將Ni添加至Mg17Al12中有助於提升合金氫化時之氫化百分比與吸氫速率,並降低吸氫溫度。在PCI氫化測試中,含Ni之Mg17Al12合金其氫化曲線具有三個氫化平台;由XRD結果證實,經過吸放氫反應後,含Ni之Mg17Al12合金組成已轉變為Mg17Al12、純Mg、Al3Ni及Al3Ni2,其中僅Mg17Al12與純Mg參與氫化反應,因而可推測第一平台為純Mg之氫化平台,第二平台為Mg17Al12轉變為氫化物MgH2及β相(Mg2Al3),第三平台為β相轉變為MgH2及純Al,純Mg在Mg17Al12之催化下,吸氫動力學亦獲得大幅改善。   Mg17Al12 alloy was prepared by melting method followed by annealing ,and then ball-milled with Ni for 3 hours to obtain Mg17Al12- X wt.% Ni (X=0,10,20) composite. XRD results showed that no new phases formed during ball milling ,all of the diffraction peaks correspond to Mg17Al2 and Ni. In the activation test, Mg17Al12-20 wt.% Ni composite showed the most rapid absorption rate and highest hydrogenation fraction, followed by Mg17Al12-10 wt.% Ni and pure Mg17Al12 , showed that Ni addition is useful to improve the hydrogenation properties of Mg17Al12 alloy. The hydrogenation reaction of Mg17Al12-Ni composite had been clarified by PCI and XRD, after cycles of hydriding/dehydriding, the composition of composite will changed from (Mg17Al12+Ni) to (Mg17Al12+Al3Ni+ Al3Ni2+Mg), led the hydrogenation reaction to proceed in 3 stage. This behavior is clearly visible from multi- plateaux of PCI curves.
    Appears in Collections:[機械工程研究所] 博碩士論文

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