博碩士論文 953203033 詳細資訊


姓名 高裕欽(Yu-chin Kao)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 氧化物催化劑對亞共晶Mg-Ni合金之儲放氫特性研究
(Catalytic effects of oxide on hydrogen storage characteristic of hypoeutectic Mg-Ni alloy)
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摘要(中) 本研究擬利用鑄造法製備亞共晶Mg-15 Ni合金,而後於球磨過程中將氧化物催化劑添加至亞共晶Mg-15Ni合金中,研究氧化物催化劑對亞共晶Mg-15Ni合金儲放氫特性之影響。
由X光繞射分析結果顯示,鑄態Mg-15Ni合金為Mg及Mg2Ni兩相所構成,經球磨後其繞射峰均有明顯寬化及弱化現象,而球磨中添加氧化物於Mg-15Ni合金中亦可觀察繞射峰均有明顯寬化及弱化的現象,此外也可發現微弱的氧化物繞射峰。在活化循環上,顯示添加氧化物不需長時間活化即有吸氫反應發生,以添加Cr2O3、Fe2O3效果較為明顯;在250、300 ℃儲放氫測試下,添加氧化物催化劑於Mg-15Ni合金中對吸放氫量及吸氫速率皆有所提升,然而在300 ℃下亦具有提高放氫速率與放氫比率之效果,但在250 ℃下的放氫速率仍有相當成效的效果,顯示於250 ℃下添加氧化劑並無法有效改善放氫速率。
摘要(英) This research plans to utilize casting method to prepare hypoeutectic
Mg-15Ni alloy, and then adds the oxide catalysts in hypoeutectic Mg-15Ni alloy by ball milled, studies the oxide catalysts to influence on hydrogen storage characteristic of hypoeutectic Mg-15Ni alloy.
As-cast Mg-15Ni alloy is formed by Mg and Mg2Ni two phase by the
X-rays diffraction analysis, its diffraction peaks after the ball milled are obviously broaden and weaken , and adds oxides by ball milled can also observe diffraction peak it has to be obviously broadener and weakener than As-cast Mg-15Ni alloy , in addition can find the faint oxide diffraction peak. At activation circulation, reveals addition oxide catalyst can take place to react with hydrogen promptly without activation for a long time , and effect of Cr2O3, Fe2O3 is obviously outstanding; and during pressure-composite-isothermal test at 250,300 ℃, reveals addition the oxide catalyst enhances the absorption /desorption capacity and increases hydriding/dehydriding rate for Mg-15Ni alloy, however adding the oxide catalyst enhances desorption rate and desorption ratio at 300 ℃, but a little effect for enhancing desorption rate at 250 ℃,show that addition the oxide catalyst can not improve desorption rate effectively at 250 ℃ .
關鍵字(中) ★ 儲氫合金
★ 亞共晶Mg-Ni合金
★ XRD
★ 吸放氫速率
關鍵字(英) ★ absorption/desorption rate
★ hydrogen storage alloy
★ hypoeutectic Mg-Ni alloy
★ XRD
論文目次 一、 前言與文獻回顧...................................1
1.1 前言.............................................1
1.2 儲氫合金發展簡介 ...............................2
1.3 儲氫合金種類與介紹 ...........................3
1.4 儲氫合金吸放氫原理概述...........................7
1.4.1.動力學特性.......................................7
1.4.2 熱力學特性.......................................9
1.5 研究背景與目的..................................12
二、 實驗步驟與方法..................................14
2.1 製備MN(Mg-15Ni)合金流程.........................16
2.2 球磨製備MN(Mg-15Ni)+5wt.% MexOy合金流程..........16
2.3 X 光粉末繞射分析(X-Ray powder diffraction,XRD)...16
2.4 雷射光粒徑分析儀................................16
2.5 掃描式電子顯微鏡微結構觀察......................17
2.6 儲放氫特性測試..................................17
三、 結果與討論......................................18
3.1 合金結構XRD分析................................18
3.2 粒徑分析 .......................................19
3.3 SEM分析.........................................20
3.4 儲放氫特性分析..................................22
3.4.1 活化測試........................................22
3.4.2 吸放氫速率測試..................................25
3.5 儲放氫後粒徑分析................................36
四、 結論............................................37
五、 未來研究與方向..................................38
六、 參考文獻........................................39
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指導教授 李勝隆(Sheng-long Lee) 審核日期 2008-7-18
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