電火花放電法製備奈米銀銅複合金屬流體之懸浮穩定性與控制參數研究

Preparation of Nano Silver-Copper Composite Metal Fluid Suspension Stability and its Control Parameters Study

黃玉函(Yu-Han Huang)

指導教授 ： 曾國雄

國立臺北科技大學/電資學院/電機工程系研究所/碩士(2013年)

摘要

本論文利用放電加工機(EDM)，以電火花放電(ESDM)方式，透過電弧(Arc)集中之能量將銀、銅金屬材料融溶，在純水中濺射冷卻出奈米等級之顆粒，經由設定電壓及電流等參數，並選擇各種放電脈寬時間(TON-TOFF)來製備懸浮於介電液中的複合金屬奈米顆粒。本研究中製備的奈米銀-銅複合金屬粒子，可同時具有兩種金屬的性質，銀、銅的導電性和導熱性都很高，其應用範圍廣泛。在本研究中，為了製備銀-銅複合金屬流體，故在放電加工機的正極放置銀，負極放置銅，手動切換極性控制旋鈕，使得銀、銅損失重量接近，並使用粒徑表面電位儀(Zetasizer)與電子顯微鏡(SEM)等設備分析實驗結果來探討奈米複合金屬流體的最佳製程參數。在探討奈米複合金屬流體的實驗過程中，會發現奈米複合金屬流體的界面電位太小易導致奈米顆粒容易聚集沉澱，所以本研究使用電容充電法的概念，對奈米流體進行充電，並觀察其充電過後的懸浮穩定性和對已沉澱的顆粒進行充電，發現顆粒在被充電過後，少部份會重新懸浮在溶液中。

關鍵字

放電加工機 ； 電火花放電法 ； 奈米複合流體 ； 電容充電

並列摘要

In this study, the Electric Spark Discharge Method (ESDM) is using the method of Electric Discharge Machining (EDM) in order to convert the silver and copper metallic materials to melt the materials of silver and copper by the energy of the arcing concentration, and sputter to produce nanoparticles in the deionized water. Also it is through the regulations of parameters of voltage, current, and on-off durations to invent the composite metal nanoparticles in the suspension of pure solution.In this study, nanoparticles Silver - Copper composite metal can equipped both qualities of the conductivity and thermal conductivity of silver and copper. The qualities of the conductivity and thermal conductivity of silver and copper have wide ranges of applications.In this study, to be able to produce Silver-Copper composite metal fluid, place the silver in anode and copper in cathode. It is manual switch of the Polarity which makes the losing weight of silver and copper approach the same amount. Moreover, we can use Zetasizer and SEM to analyze the results in order to investigate the process parameters of composite metal fluid.Through the experimental process of nano composite metal fluid, we will discover the small of zeta potential of nano composite metal fluid will lead precipitations of nanoparticle. That is reason that we use the method of capacitor charging to charge in nano fluid. We observe the suspension stability after the charge and charge the precipitated particles. We found that the some part of particles will suspend again in pure solution after charging.

並列關鍵字

Electric Discharge Machining ； Electric Spark Discharge Method ； Nano Composite Fluid ； Electric capacity charge

參考文獻

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