RESEARCH ON PHYSICAL AND CHEMICAL PRINCIPLES AFFECTING HIGH TEMPERATURE MATERIALS FOR ROCKET NOZZLES. Quarterly Progress Report, April 1, 1963-June 30, 1963

Technical Report · Thu Oct 31 00:00:00 EST 1963

OSTI ID:4655509

Lowrie, R

The development and properties of refractory materials are described. Corrosion of zirconium carbide, niobium carbide, and niobium carbide-zirconium carbide systems by carbon dioxide and hydrochloric acid at 2250 deg C is reported. Corrosion of silver-tungsten alloys by carbon dioxide and oxygen at 2150 to 2440 deg K is summarized. Measurements of pyrolytic and ZTA graphite corrosion by carbon dioxide and oxygen at 2100 to 2800 deg K are shown. At 2300 deg C the rate of formation of methane from graphite and hydrogen is greatly reduced by the addition of helium, at constant hydrogen pressure. Up to 2000 deg C the effect of helium is small. The pyrolysis of methane on graphite at 2000 deg C is tabulated. Oxidation of tungsten to form WO/sub 2/ and WO/sub 3/ is reported. Vaporization of hafnium borides at 2297 to 2538 deg K is analyzed. The lattice parameters of ZrB/sub 2/ at of TiN/sub 0.6/ and TiN/sub 0.75/ are discussed. Powder metallurgical techniques are used to prepare TiB/sub 2/, ZrB/sub 2/, HfB/ sub 2/, NbB/sub 2/, a nd TaB/sub 2/ for detailed x-ray characterization. The electric conductivity of NbC-ZrC systems is reported. General descriptions are given of analytical techniques for free carbon in carbides and spectrographic methods for metallic impurities in carbides and borides. Preliminary roomtemperature measurements are reported of the elastic properties of polycrystalline ZrB/sub 2/. Titanium carbide is brazed to tungsten with a platinum-boron system. A largegrained polycrystalline specimen of ZrC is plastically deformed in creep at 2134 deg C. Metallographic and x-ray examinations of polycrystalline TiC specimens deformed in creep reveal an increasing development with deformation of subgrains having preferred orientation. (N.W.R.)

• Research Organization: Union Carbide Corp. Research Inst., Tarrytown, N.Y.; Union Carbide Corp. Parma Research Center, Ohio
• DOE Contract Number: DA-30-069-ORD-2787
• NSA Number: NSA-17-034328
• OSTI ID: 4655509
• Report Number(s): NP-12991
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-63
• Country of Publication: United States
• Language: English

Related Subjects

METALS, CERAMICS, AND OTHER MATERIALS
BORIDES
BORON
BRAZING
CARBIDES
CARBON
CARBON DIOXIDE
CORROSION
CREEP
CRYSTALLIZATION
CRYSTALS
ELASTICITY
ELECTRIC CONDUCTIVITY
GRAPHITE
HAFNIUM BORIDES
HELIUM
HYDROCHLORIC ACID
HYDROGEN
LATTICES
METHANE
NIOBIUM BORIDES
NIOBIUM CARBIDES
OXIDATION
OXYGEN
PLATINUM
PREPARATION
PYROLYSIS
PYROLYTIC GRAPHITE
QUALITATIVE ANALYSIS
REFRACTORIES
ROCKETS
SILVER ALLOYS
SPACE FLIGHT
TEMPERATURE
THALLIUM BORIDES
TITANIUM BORIDES
TITANIUM CARBIDES
TITANIUM NITRIDES
TUNGSTEN
TUNGSTEN ALLOYS
TUNGSTEN OXIDES
VAPORS
X RADIATION
ZIRCONIUM BORIDES
ZIRCONIUM CARBIDES