Composition for use in high-temperature hydrogen-fluorine environments and method for making the composition
The present invention relates to a composition particularly suitable for use as structural components subject to hightemperature environments containing gaseous hydrogen and fluorine. The composition of the present invention consists essentially of lanthanum hexaboride-molybdenum diboride with dispersed silicon. The composition is formed by hot pressing a powder mixture of lanthanum hexaboride as the major constituent and molybdenum disilicide. This composition exhibits substantial resistance to thermal shock and corrosion in environments containing hydrogen and fluorine gases at material surface temperatures up to about 1850* K. Upon exposure of the hot-pressed composition to high-temperature environments containing fluorine gases, a highly protective layer of lanthanum trifluoride containing dispersed molybdenum is formed on exposed surfaces of the composition.
- Assignee:
- Department of Energy
- Patent Number(s):
- US 4309467
- OSTI ID:
- 5483683
- Country of Publication:
- United States
- Language:
- English
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Composition for use in high-temperature hydrogen-fluorine environments and method for making the composition
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Related Subjects
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALLOYS
BORIDES
BORON COMPOUNDS
CHEMICAL COMPOSITION
CORROSION PROTECTION
CORROSION RESISTANCE
DISPERSIONS
ELEMENTS
FABRICATION
GAS LASERS
HIGH TEMPERATURE
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LANTHANUM BORIDES
LANTHANUM COMPOUNDS
LASERS
MECHANICAL STRUCTURES
MOLYBDENUM BORIDES
MOLYBDENUM COMPOUNDS
NOZZLES
RARE EARTH COMPOUNDS
SEMIMETALS
SILICON
SILICON ALLOYS
STRESSES
THERMAL STRESSES
TRANSITION ELEMENT COMPOUNDS