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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/2747


    Title: 機械合金法合成含鋁之Mg2Ni儲氫合金的結構與特性研究
    Authors: 許傅凱;Fu-Kai Shu
    Contributors: 機械工程研究所
    Keywords: amorphous;mechanical alloying;Mg2Ni
    Date: 2006-06-29
    Issue Date: 2009-09-21 11:54:38 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 本研究目的在於探討製程方式與添加鋁粉對IECP法所製備的Mg2Ni合金之結構、表面型態與吸放氫特性的影響。分別將Mg2Ni與Mg2Ni 混合鋁粉配製為 (Mg2Ni)0.9Al0.1粉體,藉由機械合金法球磨後,以X光繞射分析(XRD)、掃描式電子顯微鏡(SEM)、微分掃描熱分析儀(DSC)觀察結構、表面型態與熱行為之變化,並進行吸放氫測試(PCI),以暸解Mg2Ni與(Mg2Ni)0.9Al0.1粉體於球磨15小時後的粉體結構與表面型態,對於吸放氫的影響。 結果顯示Mg2Ni與(Mg2Ni)0.9Al0.1粉體經機械合金法球磨,隨著球磨時間增加,晶粒尺寸逐漸細化導致繞射峰有寬化與強度弱化的現象,當球磨至15小時,Mg2Ni與(Mg2Ni)0.9Al0.1粉體的內部結構已趨於非晶質化,此時(Mg2Ni)0.9Al0.1粉體有合金化現象,產生另ㄧ繞射峰Al3Ni。球磨15小時後,由於粉體表面積增加致使表面張力隨之增加,而有抗機械力粉碎效果產生團聚現象。IECP法所製備的Mg2Ni經球磨15小時後,於溫度300℃與壓力40atm條件下,活化1小時吸氫量即可達3.0wt.%。球磨15小時的(Mg2Ni)0.9Al0.1粉體,於溫度200℃吸放氫曲線中可觀察放氫平台壓,其壓力與放氫量分別為0.16atm與0.6wt.%。 This research purpose lies in the influence of manufacturing process and aluminum addition on the structure, appearance and hydriding characteristic of Mg2Ni prepared by IECP. The structure, appearance and hydriding characteristic of Mg2Ni and (Mg2Ni)0.9Al0.1 by the ball milling for 15 hours have been examined by X-ray diffraction(XRD), scanning electron microscopy(SEM), differential scanning calorimetric(DSC) and pressure concentration isothermal(PCI). With the milling time boost, grain refinement of Mg2Ni and (Mg2Ni)0.9Al0.1 results in the phenomenon of broad and weak peak which tends towards amorphous phase then the peak Al3Ni arises from (Mg2Ni)0.9Al0.1 by the ball milling for 15 hours. The agglomeration phenomenon is due to the surface tension increases with fine powder after 15 hours of ball milling. The Mg2Ni prepared by IECP after 15 hours of ball milling activates for an hour to absorb hydrogen 3.0wt.% under 3000C and 40atm. The PCI curve of (Mg2Ni)0.9Al0.1 is by 15 hours of ball milling can be observed dehydriding plateau that pressure is 0.16atm and dehydrogen amount is 0.6wt.% at 2000C.
    Appears in Collections:[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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