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Determination of Graphite-Liquid-Vapor Triple Point by Laser Heating
AEROSPACE CORP EL SEGUNDO CA AEROPHYSICS LAB
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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.
APPROVED FOR PUBLIC RELEASE