Abstract
ABSTRACT Micro-holes of conductive ceramic are required in micro structures. Micro-electrical discharge machining (Micro-EDM) is an effective machining method since EDM is as process for shaping hard metals and complex-shaped holes by spark erosion in all kinds of electro-conductive materials. However, as the depth of micro hole increases, the machining condition becomes more unstable due to inefficient removal of debris between the electrode and the workpiece. In this paper, micro-EDM was performed to evaluate machining characteristic such as electrode wear, machining time, taper angle, radial clearance with varying voltage and ultrasonic vibration on 10 vol.% Carbon-nanotube reinforced conductive Al 2 O 3 composite fabricated by spark plasma sintering in previous research.Key Words : CNT reinforced Conductive Al 2 O 3 composite(탄소나노튜브 강화 전도성 알루미나 복합소재), Micro-EDM(마이크로방전가공), Ultrasonic vibration(초음파 진동), Micro-hole(미세구멍), Machining characteristic(가공특성) * Graduate School of Convergence Science, Pusan UNIV.** Gwangyang Steel Works, POSCO Ltd.#*** Corresponding Author : Dept. of Automotive Engineering, Gyungnam National UNIV. of Science and Technology E-mail : nkkim@gntech.ac.kr
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