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Micro electrical discharge drilling characteristics of conductive SiC–Ti2CN composite

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Abstract

An electrically conductive SiC-Ti2CN composite was fabricated from β-SiC and TiN powders with 2 vol% equimolar Y2O3-Sc2O3 additives by conventional hot-pressing. The composite (electrical resistivity of nearly 10-4 Ω·cm) was wire electro discharge machined into a specimen having a thickness of 500 μm. Entrance clearance, machining time, number of shorts, material removal rate (MRR), counts, and the effects of the capacitance and voltage of conductive SiC-Ti2CN composite during micro electrical discharge drilling were measured and compared to those of SUS304. As the unit discharge energy increased, entrance clearance, machining time, and number of shorts decreased. A decrement in the number of shorts was the main reason for decrements in entrance clearance and machining time. MRR was proportional to unit discharge energy. The study to determine the location of shorts during electro discharge drilling was also conducted. It was founded that the short circuit occurred mainly at the beginning (0–1000 cts) because of low electrical density, and right before the exit (3000–5000 cts) owing to the difficulty of removing debris. Both the capacitance and voltage tended to be inversely proportional to the number of shorts.

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Authors and Affiliations

  1. Department of Mechanical and Information Engineering, The University of Seoul, Seoul, 02504, Korea

    Joon Yeong Gwon & Won Tae Kwon

  2. Functional Ceramic Laboratory, Department of Material Science and Engineering, The University of Seoul, Seoul, 02504, Korea

    Seung Hoon Jang & Young-Wook Kim

Authors
  1. Joon Yeong Gwon
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  2. Seung Hoon Jang
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  3. Won Tae Kwon
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  4. Young-Wook Kim
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Corresponding author

Correspondence to Won Tae Kwon.

Additional information

Recommended by Associate Editor In-Ha Sung

Joon Yeong Gwon received his B.S. and M.S. in Mechanical Information Engineering from University of Seoul. He is currently an Associate Rotary Compressor Development team in LG Electronics. He is involved in developing 9 frame rotary compressor for air conditioner.

Won Tae Kwon received his B.S., M.S. degrees from Seoul National University, and Ph.D. degree from Northwestern University in 1982, 1984 and 1992, respectively. Prof. Kwon is currently a Professor of the Department of Mechanical and Information Engineering of University of Seoul, Korea. His research fields include micro machining and machining process optimization.

Young-Wook Kim received his B.S. from Yonsei University in 1981, and M.S. and Ph.D. degrees in Materials Science and Engineering from the Korea Advanced Institute of Science and Technology (KAIST), Korea, in 1983 and 1990, respectively. He is currently a Professor of Materials Science and Engineering at University of Seoul. Prof. Kim is a fellow of the American Ceramic Society and academician in World Academy of Ceramics. His research interests include the microstructural control of nonoxide ceramics, the mechanical, tribological, electrical and thermal properties of SiC ceramics, and the processing of SiC membranes.

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Gwon, J.Y., Jang, S.H., Kwon, W.T. et al. Micro electrical discharge drilling characteristics of conductive SiC–Ti2CN composite. J Mech Sci Technol 32, 3351–3358 (2018). https://doi.org/10.1007/s12206-018-0638-2

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  • DOI: https://doi.org/10.1007/s12206-018-0638-2

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