Characterization of Ultra-fast Deposited Polycrystalline Graphite by a CO₂ Laser-assisted Combustion-flame Method
High deposition rate, 750 μm/min, crystalline graphite was deposited on WC substrates by a CO2 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 CO2 laser power.
T. K. McKindra et al., "Characterization of Ultra-fast Deposited Polycrystalline Graphite by a CO₂ Laser-assisted Combustion-flame Method," Applied Surface Science, Elsevier, Feb 2009.
The definitive version is available at http://dx.doi.org/10.1016/j.apsusc.2008.12.060
Materials Science and Engineering
United States. Office of Naval Research
Keywords and Phrases
Crystalline Graphite; High Deposition Rate; Laser-Assisted Combustion-Flame Deposition
Article - Journal
© 2009 Elsevier, All rights reserved.