電火花放電法製備奈米金屬流體之放電成功率量測電路設計與驗證

Design and Demonstration of Discharge Successful Rate Measurement Circuit for Nano-Metal Fluid by Using the Electric Spark Discharge Method

吳昌吉(Chang-Ji Wu)

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)，以電火花放電法(ESDM)，透過電弧(Arc)將金屬材料熔融成奈米等級之顆粒，其製程簡單且快速可大量製造、低成本、對環境汙染較小。製程參數與放電成功之間有著密切的關係，如：電極設計、極間電壓、極間電流、放電脈寬時間(TON-TOFF)、介電液與環境溫度等因素，皆會影響製備奈米金屬流體的成功率，故本論文設計一放電成功率量測電路，探討各種製程參數設定對製備奈米金屬流體之放電成功率的影響，以純度99.9%的銀金屬製備奈米金屬流體，透過雷射光散射儀觀察奈米金屬流體的顆粒大小與放電成功次數之關係。實驗結果顯示，放電成功率並非為精確值，而是範圍值，且放電成功率會隨著製程時間的增加而遞減。製備銀金屬流體時，在等比例的放電脈寬時間條件下，30μs -30μs的放電成功率最高，製程效率最佳，放電成功率約為52.96%。

關鍵字

放電加工機 ； 電火花放電法 ； 放電成功率量測電路 ； 雷射光散射儀 ； 奈米銀

並列摘要

In this study, Electric Discharge Machining (EDM) was used to melt metallic material into nanoparticles which proposed by Electric Spark Discharge Method (ESDM). The process is easy and rapid to produce with lower cost and lower environmental pollution. The processing parameters like electrode design, discharge voltage and current, discharge on-off duration, types of pure solution ,and temperature, is highly correlation between the successful rate of developing metallic nanofluid. A discharge successful rate measurement circuit was designed to measure the influence of the discharge successful rate with different parameters settings. Metallic nanofluid of Silver with 99.9% purity was used. The zetasizer nano system was used to observed the relation between particle size times of successful discharge. The experiment showed that discharge successful rate is not a precise value but a range, and the discharge successful rate is in inverse proportion to processing time, and 30μs -30μs on-off duration had best performance with approximately 52.96% discharge successful rate.

並列關鍵字

Electric Discharge Machining ； Electric Spark Discharge Method ； Discharge Successful Rate Measurement Circuit ； Zetasizer Nano System ； Nano Silver

參考文獻

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