Determination of Graphite-Liquid-Vapor Triple Point by Laser Heating

Abstract

A technique was developed for measuring the melting temperatures of graphite, and the graphite-liquid-vapor triple point by means of continuous HF laser in the pressure range 120 to 215 atm. The triple point was found to be 120 + or - 10 atm and 4130 + or - 30 K for pyrolytic graphite. The results with neon, argon, and krypton as pressurization gases were concordant. A vapor-solid- liquid phase diagram was obtained in the vicinity of triple point. Photomicrography, electron micrography, x-ray diffraction, and ion microprobe mass analysis were used to characterize the structure of frozen liquid droplets, the pyrolytic graphite matrix, and condensed vapor.

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Document Details

Document Type
Technical Report
Publication Date
Jan 30, 1976
Accession Number
ADA021168

Entities

People

  • D. J. Spencer
  • E. T. Chang
  • N. A. Gokcen
  • T. M. Poston

Organizations

  • The Aerospace Corporation

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Diffraction
  • Graphitic Materials
  • Heat Energy
  • Hydrogen Fluoride Lasers
  • Laser Beams
  • Lasers
  • Liquid Phases
  • Measurement
  • Melting Point
  • Optical Pyrometers
  • Phase
  • Phase Diagrams
  • Pressure Measurement
  • Pressurization
  • Radiation
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Chemistry
  • Physics

Readers

  • Computer Programming and Software Development.
  • Molecular Photonics/Laser Physics
  • Thin Film Deposition Science.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers
  • Microelectronics
  • Microelectronics - Graphene