Accession Number : AD0697753

Title :   THE THERMODYNAMICS OF THE GRAPHITE-CARBON VAPOR SYSTEM,

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : Krieger,F. J.

Report Date : OCT 1969

Pagination or Media Count : 40

Abstract : The report describes the thermodynamic investigation of graphite over a range of temperatures up to 6000K and pressures up to 1000 atmospheres. Two sets of equilibrium composition equations were used--one representing a pure gas phase, the other a heterogeneous system of gaseous and solid carbon. The heterogeneous chemical system was unique in that, although it involved two phases and a variety of chemical species, it comprised only one chemical element. The mathematical solution of the system of equations representing the heterogeneous chemical system was subject, therefore, to the physical constraint of one degree of freedom. The results of the computational program are presented in both tabular and graphic form. The latter is a conventional Mollier diagram in which specific enthalpy is plotted against specific entropy, with cross plots of temperature, pressure, molecular weight, and moles of condensed carbon. A carbon phase diagram is also presented in which the computed sublimation curve terminates at an experimentally determined triple point. (Author)

Descriptors :   (*GRAPHITE, *THERMODYNAMICS), (*CARBON, THERMODYNAMICS), HIGH PRESSURE, HIGH TEMPERATURE, CHEMICAL EQUILIBRIUM, MATHEMATICAL ANALYSIS, PHASE DIAGRAMS

Subject Categories : Physical Chemistry
      Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE