Characterization of ultra-fast deposited polycrystalline graphite by a CO 2 laser-assisted combustion-flame method

Travis McKindra, Sandeep Patil, Matthew J. O'Keefe, Yaoxuan Han, Hao Ling, Yongfeng Lu

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

High deposition rate, 750 μm/min, crystalline graphite was deposited on WC substrates by a CO 2 laser-assisted combustion-flame method at laser powers between 300 and 800 W. The structures, which were identified as pillars, were characterized by various methods. The pillars were cylindrical in shape and grew to a size of approximately 3 mm in length and in a few minutes. The laser power did not affect the overall length of the pillar, but caused changes in the physical shape. X-ray and electron diffraction results revealed the pillars to be crystalline graphite regardless of the laser power. Investigation of the pillars by scanning electron microscopy showed two distinct microstructural areas: an inner core of dense material surrounded by an outer shell of lamellar-like material. The core/shell microstructure was unaffected by the level of CO 2 laser power.

Original languageEnglish (US)
Pages (from-to)5025-5030
Number of pages6
JournalApplied Surface Science
Volume255
Issue number9
DOIs
StatePublished - Feb 15 2009

Keywords

  • Crystalline graphite
  • High deposition rate
  • Laser-assisted combustion-flame deposition

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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