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Student Number 943203004
Author Chun-Lin Wu(吳俊霖)
Author's Email Address 943203004@cc.ncu.edu.tw
Statistics This thesis had been viewed 1261 times. Download 328 times.
Department Mechanical Engineering
Year 2006
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Investigation the EDM Behaviour of arbon Nanotube
for Electrode Material
Date of Defense 2007-06-22
Page Count 85
Keyword
  • Cu/MWCNT composite
  • Electrical Discharge Machining (EDM)
  • Multi-Walled Carbon Nanotube (MWCNT)
  • Abstract Copper and its compounds such as Cu-W alloy are the most common electrode materials in application of electrical discharge machining (EDM). However, due to its intrinsic modest melting temperature and high coefficient of thermal expansion which result in low working efficiency, it is not suitable for high current (>100Amp) and high material removal rate (MRR) EDM condition.
    An innovative electrode material was fabricated by adding different amount of Multi-Walled Carbon Nanotube (MWCNT) into copper matrix to enhance its material removal rate and durability in view of carbon nanotube’s remarkable properties such as high thermal conductivity and electrical conductivity. The purpose of this master thesis is to investigate the electrical discharge machining behaviors by this new type of electrode material.
    In this approach, the nano-size (diameter:20~40 nm; length:5~15 μm) MWCNT with 0.5, 1.0, 3.0 wt % were mixed with copper powder (40~50 μm). After well dispersed by shaking/ball-milling process, the mixture was poured into the graphite die and underwent 16 MPa pressure to hot press for 1050℃and 60 min under 10-2 Torr vacuum condition. The hot-pressed disk-shape Cu/MWCNT composite was then machined into rectangle by mill and WEDM to serve as electrode for investigating the EDM behavior. The effect of EDM parameters such as pulse duration (Ton), discharging current (Ip) and the improvement of material removal rate (MRR) were analyzed.
    From the experimental results, the highest MRR with Cu/MWCNT electrode was achieved by using 100 μs pulse duration. To compare with electrode wear rate (EWR) between pure copper and Cu/MWCNT electrodes, it was found that all three compositions of Cu/MWCNT electrodes have lower EWR when the Ip is below 8 A. On the other hand, copper composite with
    3.0 wt % MWCNT has the best MRR up to 33 % by using the Ip at 18 A.
    Table of Content 摘 要i
    圖目錄vii
    表目錄ix
    表目錄ix
    第一章 緒論1
    1-1 研究動機與目的1
    1-2 研究方法2
    第二章 碳奈米管之簡介4
    2-1 碳奈米管之發現4
    2-3 碳奈米管之特性8
    2-4 碳奈米管的生長機制與合成方法11
    2-5 碳奈米管的應用17
    第三章 實驗原理20
    3-1 放電加工基本原理20
    3-2 放電加工材料去除機制22
    3-3 放電加工參數設定及其影響25
    3-4 無電鍍(Electroless Plating)原理29
    3-5 混合定律(Rule of Mixture)31
    第四章 實驗設備與方法32
    4-1 實驗設備32
    4-3 實驗前置準備44
    4-3 實驗方法46
    4-3-1 無電鍍銅47
    4-3-2 放電加工參數設定47
    第五章 結果與討論49
    5-1 製備CNT/Cu複合電極材料之探討49
    5-2 放電加工之參數探討53
    5-2-1 脈衝時間對材料移除率及電極消耗率之影響53
    5-2-2 峰值電流對材料移除率及電極消耗率之影響56
    5-3 碳奈米管添加量對材料去除率及電極消耗率之影響62
    5-4 放電波形探討66
    5-5 碳奈米管添加量對表面粗糙度的影響68
    第六章 結 論70
    參考文獻71
    個人簡歷74
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    Advisor
  • Fuang-Yuan Huang(黃豐元)
  • Files
  • 943203004.pdf
  • approve in 2 years
    Date of Submission 2007-07-03

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