Composition and method for brazing graphite to graphite

Patent · Sun Jan 01 04:00:00 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
• 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

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