Lanthanum-hexaboride carbon composition for use in corrosive hydrogen-fluorine environments

Patent · Thu Jan 01 00:00:00 EST 1981

OSTI ID:863855

Holcombe, Cressie E ^[1]; Kovach, Louis ^[2]; Taylor, Albert J ^[3]

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1. Knoxville, TN
2. Oak Ridge, TN
3. Ten Mile, TN

The present invention relates to a structural composition useful in corrosive hydrogen-fluorine environments at temperatures in excess of 1400.degree. 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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: W-7405-ENG-26
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4261753
• OSTI ID: 863855
• Country of Publication: United States
• Language: English

Related Subjects

lanthanum-hexaboride
carbon
composition
corrosive
hydrogen-fluorine
environments
relates
structural
useful
temperatures
excess
1400
degree
formed
isostatically
pressed
sintered
hot-pressed
mixture
lanthanum
hexaboride
particles
10-30
vol
reacts
high-temperature
fluorine-containing
bases
form
adherent
layer
corrosion-inhibiting
trifluoride
exposed
surfaces
composite
significantly
strengthens
enhances
thermal
shock
resistance
facilitates
machining
shock resistance
thermal shock
exposed surface
composition useful
lanthanum hexaboride
isostatically pressed
exposed surfaces
containing base
hydrogen-fluorine environments
carbon composition
corrosive hydrogen-fluorine
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