Fabrication of deep micro-holes in reaction-bonded SiC by ultrasonic cavitation assisted micro-EDM

Pay Jun Liew, Jiwang Yan, Tsunemoto Kuriyagawa

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Ultrasonic vibration was applied to dielectric fluid by a probe-type vibrator to assist micro electrical discharge machining of deep micro-holes in ceramic materials. Changes of machined hole depth, hole geometry, surface topography, machining stability and tool material deposition under various machining conditions were investigated. Results show that ultrasonic vibration not only induces stirring effect, but also causes cloud cavitation effect which is helpful for removing debris and preventing tool material deposition on machined surface. The machining characteristics are strongly affected by the vibration amplitude, and the best machining performance is obtained when carbon nanofibers are added into the vibrated dielectric fluid. As test pieces, micro-holes having 10 μm level diameters and high aspect ratios (>20) were successfully fabricated on reaction-bonded silicon carbide in a few minutes. The hybrid EDM process combining ultrasonic cavitation and carbon nanofiber addition is demonstrated to be useful for fabricating microstructures on hard brittle ceramic materials.

Original languageEnglish
Pages (from-to)13-20
Number of pages8
JournalInternational Journal of Machine Tools and Manufacture
Volume76
DOIs
Publication statusPublished - 2014 Jan 1

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Keywords

  • Carbon nanofiber
  • Cavitation
  • Ceramic material
  • Micro-electro discharge machining
  • Reaction-bonded silicon carbide
  • Ultrasonic vibration

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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