Pulsed laser processing of nano-polycrystalline diamond: A comparative study with single crystal diamond

Shoko Odake, Hiroaki Ohfuji, Takuo Okuchi, Hiroyuki Kagi, Hitoshi Sumiya, Tetsuo Irifune

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We have conducted laser processing of ultrahard nano-polycrystalline and single crystalline diamonds (NPD, SCD, respectively) using nano-pulsed near-ultraviolet laser, and the machining properties were compared through microstructural examinations by SEM, TEM and Raman spectroscopy. The cut depth of the laser-cut grooves was observed to be deeper for the NPD than for the SCD. This is probably due to the lower thermal conductivity feature of NPD, which provides higher absorption efficiency of the laser energy and decreases the laser ablation threshold. TEM cross-section observation showed that the processed grooves in the both types of diamonds are covered with identical laser-modified layers (~ 1 μm thick) composed of roughly oriented nanocrystalline graphite. A marked difference was observed between the laser-processed surfaces of NPD and SCD: in the former the diamond-graphite interface is almost linear and undamaged, whereas in the latter the boundary is slightly folded and significantly distorted. These textural features suggest that different laser-machining processes are involved between NPD and SCD in the microscopic scale. Our results demonstrate that pulsed laser can be used even more effectively for the fabrication of nano-polycrystalline diamond than the case for single crystal diamond.

Original languageEnglish
Pages (from-to)877-880
Number of pages4
JournalDiamond and Related Materials
Volume18
Issue number5-8
DOIs
Publication statusPublished - May 1 2009

Keywords

  • Microstructure
  • Nanocrystalline
  • Superhard materials
  • Synthetic diamond

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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