Accession Number : AD0258410

Title :   AN EXPERIMENTAL PROGRAM FOR OBTAINING THE THERMODYNAMIC PROPERTIES OF PROPELLANT COMBUSTION PRODUCTS

Corporate Author : PHILCO NEWPORT BEACH CALIF AERONUTRONIC DIV

Personal Author(s) : HILDENBRAND,D.L. ; THEARD,L.P.

Report Date : 15 JUN 1961

Pagination or Media Count : 1

Abstract : Torsion-effusion studies of the vaporization of ZrF4 were completed. The results yield a condensation coefficient of about 0.08 and a heat of sublimation of 55.8 kcal/mole at 298 K. The heat of formation of ZrF4(g) at 298 K was derived as -401.1 ! 3 kcal/mole. Studies of the vaporization of ZrF4 in the presence of finely divided Zr indicate that lower fluorides are not formed under these conditions. The vapor pressures of AlF3 and a 1:1 mole ratio mixture of Li and Al fluorides were measured by the torsion-effusion method. A heat of sublimation at 298 K of 71.0 ! 0.5 kcal/mole was obtained for AlF3, from which the heat of formation of AlF3(g) at 298 K was derived as -285.3 ! 2 kcal/mole. The heat of formation of LiAlF4 at 298 K was derived as -447 ! 7 kcal/mole. Measurements of the dissociation pressure of AlN are in progress. The vaporization of Mg3N2 was studied from 1100 to 1260 K by the torsion method. A condensation coefficient of about 0.005 was indicated. (Author)

Descriptors :   *COMBUSTION CHAMBER GASES, *ROCKET PROPELLANTS, ALUMINUM COMPOUNDS, BORON COMPOUNDS, COMBUSTION, DISSOCIATION, EVAPOTRANSPIRATION, FLUORIDES, HEAT OF FORMATION, LITHIUM COMPOUNDS, MAGNESIUM COMPOUNDS, MASS SPECTROSCOPY, NITRIDES, PLATINUM, TANTALUM, THERMODYNAMICS, VAPOR PRESSURE, VAPORIZATION, VAPORS, ZIRCONIUM COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE