Composition and method for brazing graphite to graphite

Patent · Tue Feb 21 04:00:00 EST 1984

OSTI ID:7005383

Taylor, A J; Dykes, N L

The present invention is directed to a brazing material for joining graphite structures that can be used at temperatures up to about 2,800 C. The brazing material formed of a paste-like composition of hafnium carbide and uranium oxide with a thermosetting resin. The uranium oxide is converted to uranium dicarbide during the brazing operation and then the hafnium carbide and uranium dicarbide form a liquid phase at a temperature about 2,600 C with the uranium diffusing and vaporizing from the joint area as the temperature is increased to about 2,800 C so as to provide a brazed joint consisting essentially of hafnium carbide. This brazing temperature for hafnium carbide is considerably less than the eutectic temperature of hafnium carbide of about 3,150 C. The brazing composition also incorporates the thermosetting resin so that during the brazing operation the graphite structures may be temporarily bonded together by thermosetting the resin so that machining of the structures to final dimensions may be completed prior to the completion of the brazing operation. The resulting brazed joint is chemically and thermally compatible with the graphite structures joined thereby and also provides a joint of sufficient integrity so as to at least correspond with the strength and other properties of the graphite.

• Assignee: Dept. of Energy, Washington, DC (United States)
• Patent Number(s): A; US 4432821
• Application Number: PPN: US 6-406829
• OSTI ID: 7005383
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
BRAZED JOINTS
BRAZING
CARBON
CHEMICAL COMPOSITION
COMPATIBILITY
ELEMENTAL MINERALS
ELEMENTS
FABRICATION
GRAPHITE
JOINING
JOINTS
MINERALS
NONMETALS
WELDED JOINTS
WELDING