Accession Number : AD0687435

Title :   THE THERMODYNAMICS OF THE BORON CARBIDE BORON-CARBON VAPOR SYSTEM,

Corporate Author : RAND CORP SANTA MONICA CALIF

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

Report Date : MAR 1969

Pagination or Media Count : 41

Abstract : An investigation of the thermodynamic properties of boron carbide over a range of temperatures up to 6000 deg K and pressures up to 1000 atmospheres. Two sets of equilibrium composition equations are used--one representing a pure gas phase, the other a heterogeneous system of gas and condensed (solid or liquid) boron carbide. The gas phase of the heterogenous chemical system, like the homogeneous gas phase, comprises 23 gaseous boron-carbon species. 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, and molecular weight or moles of condensed boron carbide. (Author)

Descriptors :   (*CARBIDES, *THERMODYNAMICS), (*BORON COMPOUNDS, THERMODYNAMICS), (*ATMOSPHERE ENTRY, *ABLATION), PHASE STUDIES, CARBON, BORON, SUBLIMATION, ENTROPY, THERMOCHEMISTRY

Subject Categories : Physical Chemistry
      Ceramics, Refractories and Glass
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE