THERMODYNAMIC AND KINETIC STUDIES FOR A REFRACTORY MATERIALS PROGRAM
Technical Report
·
OSTI ID:4673807
Studies during 1962 are reported on a program to provide the thermodynamic and kinetic data which are required to describe the chemical behavior of the zircomiium and hafnium carbides amid 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/su b 2/, Co, NH/sub 3/, and N/sub 2/. Preparation of high purity ZrC, ZrO/sub 2/ HfB/sub 2/, and HfC is described. Experimental low temperature heat capacity data for ZrC and heat content data for ZrB/sub 2/ from 410 to 1126 deg K are presented. Current status of calorimetric, electron diffraction, equilibria, amid spectroscopy studies are reported. Kinetic studies are described on the oxidation of ZrC from 550 to 650 deg C at one atmosphere oxygen pressure and from 850 to 1900 deg C at oxygen pressures of 3 to 26 torr, on the oxidation of ZrB/sub 2/ for the conditions 1200 to 1500 deg C and oxygen pressure of 7 to 38.75 torr and 945 to 1256 deg C at oxygen pressures up to one atmosphere, ub 2/. The results of metallographic examination of the oxidized ZrC and ZrB/sub 2/ samples are discussed. Electrical conductivity studies are reported on pure ZrO/sub 2/ from room to 1700 deg C. The oxidation kinetics of molybdenium metal were studied in the temperature range 1400 to 2000 deg K and oxygen pressures of 10/sup -5/ to 10/sup -6/ atmospheres using a mass spectrometer with necessary source modifications. (auth)
- Research Organization:
- Little (Arthur D.) Inc., Cambridge, Mass.
- NSA Number:
- NSA-17-030961
- OSTI ID:
- 4673807
- Report Number(s):
- ASD-TDR-62-204(Pt.II)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CALORIMETERS
CARBON MONOXIDE
CHEMICAL REACTIONS
CHLORINE
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRONS
FLUORINE
HAFNIUM BORIDES
HAFNIUM CARBIDES
HIGH TEMPERATURE
HYDROFLUORIC ACID
HYDROGEN
IMPURITIES
MASS SPECTROMETERS
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM
NITROGEN
OXIDATION
OXYGEN
PREPARATION
PRESSURE
REACTION KINETICS
SPECTROSCOPY
STABILITY
TEMPERATURE
THERMODYNAMICS
VACUUM
WATER
ZIRCONIUM BORIDES
ZIRCONIUM CARBIDES
ZIRCONIUM OXIDES
CARBON MONOXIDE
CHEMICAL REACTIONS
CHLORINE
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRONS
FLUORINE
HAFNIUM BORIDES
HAFNIUM CARBIDES
HIGH TEMPERATURE
HYDROFLUORIC ACID
HYDROGEN
IMPURITIES
MASS SPECTROMETERS
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM
NITROGEN
OXIDATION
OXYGEN
PREPARATION
PRESSURE
REACTION KINETICS
SPECTROSCOPY
STABILITY
TEMPERATURE
THERMODYNAMICS
VACUUM
WATER
ZIRCONIUM BORIDES
ZIRCONIUM CARBIDES
ZIRCONIUM OXIDES