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http://dx.doi.org/10.4150/KPMI.2010.17.4.319

Characteristics of Micro EDM using Wire Electrical Discharge Grinding for Al2O3/CNTs Hybrid Materials  

Tak, Hyun-Seok (National Core Research Center for Hybrid Materials Solution, Pusan National University)
Kim, Jong-Hun (National Core Research Center for Hybrid Materials Solution, Pusan National University)
Lim, Han-Suk (Hybrid Precision Co., Business Incubator Center)
Lee, Choon-Tae (Department of Automotive & Mechanical Engineering, Silla University)
Jeong, Young-Keun (National Core Research Center for Hybrid Materials Solution, Pusan National University)
Kang, Myung-Chang (National Core Research Center for Hybrid Materials Solution, Pusan National University)
Publication Information
Journal of Powder Materials / v.17, no.4, 2010 , pp. 319-325 More about this Journal
Abstract
Electrical discharge machining (EDM) is an attractive machining technique but it requires electrically conductive ceramic materials. In this study, Alumina matrix composites reinforced with CNTs were fabricated through CNT purification, mixing, compaction and spark plasma sintering (SPS) processes. $Al_2O_3$ nanocomposites with the different CNT concentrations were synthesized. The mechanical and electrical characteristics of $Al_2O_3$/CNTs composites were examined in order to apply the materials to the EDM process. In addition, micro-EDM using wire electrical discharge grinding (WEDG) was conducted under the various EDM parameters to investigate the machining characteristics of machined hole by Field Emission Scanning Electron Microscope (FE-SEM). The results show that $Al_2O_3$/CNTs 10%Vol. was more suitable than the other materials because high conductivity and large discharge energy caused violent sparks resulting in bad machining accuracy and surface quality.
Keywords
Conductive ceramic; $Al_2O_3$/CNTs hybrid composites; Micro EDM; WEDG device;
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