Composition and method for brazing graphite to graphite

Patent · Sun Jan 01 00:00:00 EST 1984

OSTI ID:864895

Taylor, Albert J ^[1]; Dykes, Norman L ^[2]

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

The present invention is directed to a brazing material for joining graphite structures that can be used at temperatures up to about 2800.degree. 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 2600.degree. C. with the uranium diffusing and vaporizing from the joint area as the temperature is increased to about 2800.degree. 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 3150.degree. 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.

• 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 4432821
• OSTI ID: 864895
• Country of Publication: United States
• Language: English

Related Subjects

composition
method
brazing
graphite
directed
material
joining
structures
temperatures
2800
degree
formed
paste-like
hafnium
carbide
uranium
oxide
thermosetting
resin
converted
dicarbide
operation
form
liquid
phase
temperature
2600
diffusing
vaporizing
joint
increased
provide
brazed
consisting
essentially
considerably
eutectic
3150
incorporates
temporarily
bonded
machining
final
dimensions
completed
prior
completion
resulting
chemically
thermally
compatible
joined
provides
sufficient
integrity
correspond
strength
properties
uranium oxide
thermosetting resin
consisting essentially
liquid phase
brazing material
uranium dicarbide
final dimensions
eutectic temperature
material formed
brazing temperature
brazing graphite
/156/428/524/