Composition for use in high-temperature hydrogen-fluorine environments and method for making the composition
- Oak Ridge, TN
- Knoxville, TN
The present invention relates to a composition particularly suitable for as structural components subject to high-temperature 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.degree. 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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
- DOE Contract Number:
- W-7405-ENG-26
- Assignee:
- United States of America as represented by Department of Energy (Washington, DC)
- Patent Number(s):
- US 4309467
- OSTI ID:
- 864098
- Country of Publication:
- United States
- Language:
- English
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1850
components
composition
consists
consists essentially
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containing
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containing gaseous
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corrosion
degree
diboride
disilicide
dispersed
environments
environments containing
essentially
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fluorine
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hexaboride
hexaboride-molybdenum
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highly
hot
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hydrogen
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lanthanum
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material
material surface
method
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molybdenum
molybdenum disilicide
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resistance
shock
silicon
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structural components
subject
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surface
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trifluoride