An Investigation of Diamond Synthesis in an Oxygen-Acetylene Diffusion Flame

Abstract

Diamond synthesis is demonstrated in an oxygen-acetylene diffusion flame. The acetylene flame is diluted with argon to suppress sooting tendencies and is sustained and stabilized by overventilation with a surrounding oxygen flow. The result is a relatively cold flame, and the carbon film is deposited on a free-standing silicon wafer without the need for substrate cooling. Deposition patterns observed so far are nonuniform, with diamond deposited within a small annular ring surrounding a predominantly amorphous carbon film. Particle growth rates observed are in the range of 20-50 micrometer/hour, and deposit patterns are qualitatively similar to those observed in premixed oxygen-acetylene flames, however, unlike in premixed flame deposition, the temperature distribution appears to be much more nonuniform, with heat generated primarily at the diffusion flame boundary.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1990
Accession Number
ADA227224

Entities

People

  • M. A. Cappelli

Organizations

  • Stanford University

Tags

Communities of Interest

  • Materials and Manufacturing Processes
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acetylenes
  • Alkynes
  • Barometric Pressure
  • Chemical Reactions
  • Chemistry
  • Classification
  • Combustion
  • Electron Microscopes
  • Engineering
  • Flow Rate
  • High Temperature
  • Hydrocarbon Fuels
  • Hydrocarbons
  • Military Research
  • Scanning Electron Microscopes
  • Security
  • Substrates

Readers

  • Combustion science or combustion engineering.
  • Thin Film Deposition Science.