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Proceedings Paper

Amorphous diamond: a unique product of laser ablation
Author(s): Carl B. Collins Jr.; Farzin Davanloo
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Paper Abstract

Composed of sp3 bonded nodules of carbon, amorphic diamond films are deposited in vacuum onto almost any substrate by condensing carbon ions carrying keV energies. These multiply charged ions are obtained from the laser ablation of graphite at intensities in excess of 1011 W cm-2. The high energy of condensation provides both for the chemical bonding of such films to a wide variety of substrates and for low values of residual compressive stress, 0.6 - 0.8 GPa. On selected films hardness cannot be measured because of deformation of the diamond indenter and only a lower limit of 78 GPa can be reported. Coatings of 2 - 5 micrometer thicknesses have extended lifetimes of materials such as Si, Ti, ZnS, ZnSe, Ge and stainless steel against the erosive wear from high-speed particles by factors of tens to thousands. The mechanical properties of amorphic diamond films are further enhanced by a low coefficient of friction of about 0.1. The combination of these mechanical properties seems to make amorphic diamond an attractive material for use as a protective coating in current industrial applications. Deposited upon silicon, quartz or sapphire, amorphic diamond films have interesting electrical properties including a very high coefficient of emissivity.

Paper Details

Date Published: 12 April 1996
PDF: 12 pages
Proc. SPIE 2770, Laser Optics '95 and ICONO '95: Superintense Laser Fields, (12 April 1996); doi: 10.1117/12.238035
Show Author Affiliations
Carl B. Collins Jr., Univ. of Texas/Dallas (United States)
Farzin Davanloo, Univ. of Texas/Dallas (United States)

Published in SPIE Proceedings Vol. 2770:
Laser Optics '95 and ICONO '95: Superintense Laser Fields
Alexander A. Andreev; Vyacheslav M. Gordienko, Editor(s)

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