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

Patent · Tue Jan 22 04:00:00 EST 1980

OSTI ID:7062084

Holcombe, Jr, C E; Kovach, L; Taylor, A J

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 to 30 vol% carbon. The lanthanum-hexaboride reacts with the high-temperature fluorine-containing gases 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.

• DOE Contract Number: W-7405-ENG-26
• Assignee: Dept. of Energy
• Patent Number(s): None
• OSTI ID: 7062084
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ATMOSPHERES
BORIDES
BORON COMPOUNDS
CARBON
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COMBUSTION CHAMBERS
CONTROLLED ATMOSPHERES
CORROSION INHIBITORS
CORROSIVE EFFECTS
DESIGN
DISPERSIONS
ELEMENTS
FABRICATION
FLUORIDES
FLUORINE COMPOUNDS
GAS LASERS
HALIDES
HALOGEN COMPOUNDS
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LANTHANUM BORIDES
LANTHANUM COMPOUNDS
LANTHANUM FLUORIDES
LASERS
MATERIALS
MIXTURES
NONMETALS
NOZZLES
RARE EARTH COMPOUNDS
THERMAL SHOCK