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

Patent · Thu Jan 01 04:00:00 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
• 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

/501/
10-30
1400
adherent
bases
carbon
carbon composition
composite
composition
composition useful
containing base
corrosion-inhibiting
corrosive
corrosive hydrogen-fluorine
degree
enhances
environments
excess
exposed
exposed surface
exposed surfaces
facilitates
fluorine-containing
form
formed
hexaboride
high-temperature
hot-pressed
hydrogen-fluorine
hydrogen-fluorine environments
isostatically
isostatically pressed
lanthanum
lanthanum hexaboride
lanthanum-hexaboride
layer
machining
mixture
particles
pressed
reacts
relates
resistance
shock
shock resistance
significantly
sintered
strengthens
structural
surfaces
temperatures
thermal
thermal shock
trifluoride
useful
vol