Lanthanum-hexaboride carbon composition for use in corrosive hydrogen-fluorine environments
Patent
·
OSTI ID:6128535
The present invention relates to a structural composition useful in corrosive hydrogen-fluorine environments at temperatures in excess of 1400/sup 0/ K. The composition is formed of a isostatically pressed and sintered or a hot-pressed mixture of lanthanum hexaboride particles and about 10-30 vol. % carbon. The lanthanum -hexaboride reacts with the high-temperature fluorine-containing bases to form an adherent layer of corrosion-inhibiting lanthanum trifluoride on exposed surfaces of the composition. The carbon in the composite significantly strengthens the composite, enhances thermal shock resistance, and significantly facilitates the machining of the composition.
- Assignee:
- Dept. of Energy
- Patent Number(s):
- US 4261753
- OSTI ID:
- 6128535
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360301* -- Composite Materials-- Preparation & Fabrication-- (-1987)
360303 -- Composite Materials-- Mechanical Properties-- (-1987)
360305 -- Composite Materials-- Corrosion
Erosion
& Degradation-- (-1987)
42 ENGINEERING
420300 -- Engineering-- Lasers-- (-1989)
BORIDES
BORON COMPOUNDS
CARBON
CHEMICAL LASERS
COMPOSITE MATERIALS
CORROSION RESISTANCE
ELEMENTS
FIBERS
FLUID FLOW
FLUORINE
HALOGENS
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LANTHANUM BORIDES
LANTHANUM COMPOUNDS
LASERS
MATERIALS
NONMETALS
NOZZLES
RARE EARTH COMPOUNDS
SUPERSONIC FLOW
THERMAL SHOCK
VERY HIGH TEMPERATURE
360301* -- Composite Materials-- Preparation & Fabrication-- (-1987)
360303 -- Composite Materials-- Mechanical Properties-- (-1987)
360305 -- Composite Materials-- Corrosion
Erosion
& Degradation-- (-1987)
42 ENGINEERING
420300 -- Engineering-- Lasers-- (-1989)
BORIDES
BORON COMPOUNDS
CARBON
CHEMICAL LASERS
COMPOSITE MATERIALS
CORROSION RESISTANCE
ELEMENTS
FIBERS
FLUID FLOW
FLUORINE
HALOGENS
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LANTHANUM BORIDES
LANTHANUM COMPOUNDS
LASERS
MATERIALS
NONMETALS
NOZZLES
RARE EARTH COMPOUNDS
SUPERSONIC FLOW
THERMAL SHOCK
VERY HIGH TEMPERATURE