Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Characteristics of Micro EDM using Wire Electrical Discharge Grinding for Al2O3/CNTs Hybrid Materials

Al2O3/CNTs 하이브리드소재의 와이어 방전연삭을 이용한 마이크로 방전가공 특성

  • 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)
  • 탁현석 (부산대학교 하이브리드소재 솔루션 국가핵심연구센터(NCRC)) ;
  • 김종훈 (부산대학교 하이브리드소재 솔루션 국가핵심연구센터(NCRC)) ;
  • 임한석 (하이브리드 정밀회사) ;
  • 이춘태 (신라대학교 자동차기계공학과) ;
  • 정영근 (부산대학교 하이브리드소재 솔루션 국가핵심연구센터(NCRC)) ;
  • 강명창 (부산대학교 하이브리드소재 솔루션 국가핵심연구센터(NCRC))
  • Received : 2010.07.12
  • Accepted : 2010.08.09
  • Published : 2010.08.28
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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

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