The effect in EDM of a dielectric of a urea solution in water on modifying the surface of titanium

Biing Hwa Yan, Hsien Chung Tsai, Fuang Yuan Huang

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231 Scopus citations

Abstract

This study investigates the influence of the machining characteristics on pure titanium metals using an electrical discharge machining (EDM) with the addition of urea into distilled water. Additionally, the effects of urea addition on surface modification are also discussed. In the experiments, machining parameters such as the dielectric type, peak current and pulse duration were changed to explore their effects on machining performance, including the material removal rate, electrode wear rate and surface roughness. Moreover, the elemental distribution of nitrogen on the machined surface was qualitatively determined by EPMA to assess the effects on surface modification. Micro hardness and wear resistance tests were performed to evaluate the effects of the reinforced surface. Experimental results indicate that the nitrogen element decomposed from the dielectric that contained urea, migrated to the work piece, forming a TiN hard layer, resulting in good wear resistance of the machined surface after EDM.

Original languageEnglish
Pages (from-to)194-200
Number of pages7
JournalInternational Journal of Machine Tools and Manufacture
Volume45
Issue number2
DOIs
StatePublished - Feb 2005

Keywords

  • Dielectric
  • Electric discharge machining (EDM)
  • Material removal rate (MRR)
  • Surface modification
  • Surface roughness
  • Urea

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