Accession Number : AD0753713

Title :   Vaporization Kinetics and Thermodynamics of Graphite Using the High Pressure Mass Spectrometer.

Descriptive Note : Final technical rept. 1 Jun 71-31 May 72,

Corporate Author : MIDWEST RESEARCH INST KANSAS CITY MO

Personal Author(s) : Milne,Thomas A. ; Beachey,Jacob E. ; Greene,Frank T.

Report Date : DEC 1972

Pagination or Media Count : 76

Abstract : A brief review of current studies of the vaporization of graphite is presented, followed by a detailed description of our own work. Apparatus improvements are described, which allow heating of all-graphite Knudsen cells to about 3300K in vacuum without significant heating of beam system walls or objectionable outgassing. A continuously operating vacuum viewport and automatic pyrometer system is described for temperature monitoring under rapid window darkening vaporization conditions. Preliminary equilibrium ion ratio measurements are presented for the species C1 - C7 at temperatures up to 3300K. Extensive experimental results are presented on the neutral time-of-flight behavior of both carbon and low temperature gaseous species, using both the Nuclide and the Bendix mass spectrometers. (Author)

Descriptors :   (*CARBON, VAPORIZATION), (*NOSE CONES, ABLATION), REENTRY VEHICLES, HIGH TEMPERATURE, MASS SPECTROSCOPY, THERMODYNAMICS, REACTION KINETICS, NUCLEATION, ION SOURCES, MASS SPECTRA

Subject Categories : Guided Missile Dynam, Config & Cntrl Surfaces
      Guided Missile Reentry Vehicles

Distribution Statement : APPROVED FOR PUBLIC RELEASE