THERMODYNAMIC AND KINETIC STUDIES FOR A REFRACTORY MATERIALS PROGRAM
Studies developed to provide thermodynamic and kinetic knowledge needed to describe the chemical behavior of zirconium and hafnium carbides and borides at temperatures to 3000 deg K and in atmospheres of O/sub 2/, O/sub 2/ + H/sub 2/ O, Cl/sub 2/, HF, F/sub 2/, H/sub 2/, CO, NH/sub 3/, and N/sub 2/ are summarized. The studies consist of thermodynamic data for the tabulation of free energy functions of the zirconium and hafnium carbides and borides through calorimetric measurements; identification of gaseous species formed on vaporization of the carbides and borides and on their interaction with the several atmospheres by mass spectrometry; therraodynamic data for important gaseous species by electron diffraction techniques, matrix isolation spectroscopy, and equilibria studies; and development of kinetics of the reactions of the carbides and borides with the various atmospheres through studies of the over-all rates of reactions and mass transport mechanisms. The status of each is discussed in detail. The preparation and characterization of macrocrystalline, high purity ZrB/sub 2/ and ZrC are described. Low temperature heat capacity data for ZrNB/sub 2/ and heat content data foi- ZrB/sub 2/, ZrC, and Hf/B/sub 2/ are presented. The results of a study of the vaporization of ZrB/sub 2/ are also reported. (auth)
- Research Organization:
- Little (Arthur D.) Inc. Western Div., San Francisco
- NSA Number:
- NSA-16-025747
- OSTI ID:
- 4812189
- Report Number(s):
- ASD-TDR-62-204(Pt.I)
- Country of Publication:
- United States
- Language:
- English
Similar Records
RESEARCH ON PHYSICAL AND CHEMICAL PRINCIPLES AFFECTING HIGH TEMPERATURE MATERIALS FOR ROCKET NOZZLES. Quarterly Progress Report, April 1, 1963-June 30, 1963
THERMODYNAMICS OF CERTAIN REFRACTORY COMPOUNDS. PART II. CONTINUED THEORETICAL AND EXPERIMENTAL STUDIES ON AN EXTENDED LIST. Quarterly Progress Report No. 5, June 1, 1963 to August 31, 1963
Related Subjects
CALORIMETERS
CARBIDES
CARBON OXIDES
CHLORINE
CRYSTALS
DIFFRACTION
ELECTRONS
ENERGY
ENVIRONMENT
FLUORINE
GASES
HAFNIUM
HAFNIUM BORIDES
HAFNIUM CARBIDES
HEATING
HYDROGEN
INTERACTIONS
LOW TEMPERATURE
METALS, CERAMICS, AND OTHER MATERIALS
NITROGEN
OXYGEN
PHASE DIAGRAMS
QUALITATIVE ANALYSIS
REACTION KINETICS
SPECTROMETERS
SPECTROSCOPY
STABILITY
TABLES
TEMPERATURE
THERMODYNAMICS
VAPORS
WATER
ZIRCONIUM BORIDES
ZIRCONIUM CARBIDES