Ni添加對Mg17Al12合金吸放氫性質影響之研究

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姓名

翁加旺(Chia-wang Weng) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

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)

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摘要(中)

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。

摘要(英)

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.

關鍵字(中)

★ Mg17Al12
★ Ni
★ XRD
★ 儲放氫特性

關鍵字(英)

★ Mg17Al12
★ Ni
★ XRD
★ PCI
★ Hydrogen storage alloys

論文目次

中文摘要..................................................i
英文摘要.................................................ii
誌謝 ...............................................iii
總目錄.................................................iv
圖目錄.................................................vi
表目錄.............................................. viii
一、前言與文獻回顧.................................1
1.1 儲氫合金發展簡介.................................1
1.2 儲氫合金之種類與介紹.............................2
1.3 儲氫合金儲放氫基本原理...........................3
1.3.1 動力學性質.....................................3
1.3.2 熱力學性質.....................................5
1.4 Mg-Al儲氫合金介紹................................9
1.5 研究背景與實驗目的..............................12
二、實驗步驟與方法................................14
2.1 製備合金流程....................................15
2.2 球磨合金流程....................................15
2.3 X 光繞射分析(X-ray diffraction methods，XRD) ...16
2.4 電子微探針分析(EPMA)............................16
2.5 合金儲放氫特性測試..............................16
2.5.1 合金活化……………………………………………………16
2.5.2 PCI曲線(Pressure-composition-isothermal curves，
PCI)測試..............................................17
三、結果與討論....................................18
3.1 微結構分析......................................18
3.2 活化測試與吸氫速率比較..........................20
3.3 PCI曲線量測與結構分析….........................27
四、結論..........................................35
五、未來研究與方向................................36
六、參考文獻.....................................37

參考文獻

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指導教授

李勝隆(Sheng-Long Lee)

審核日期

2009-7-21

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