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Title: Composition and method for brazing graphite to graphite

Abstract

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 themore » strength and other properties of the graphite.« less

Inventors:
 [1];  [2]
  1. (Ten Mile, TN)
  2. (Oak Ridge, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
864895
Patent Number(s):
4432821
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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/

Citation Formats

Taylor, Albert J., and Dykes, Norman L. Composition and method for brazing graphite to graphite. United States: N. p., 1984. Web.
Taylor, Albert J., & Dykes, Norman L. Composition and method for brazing graphite to graphite. United States.
Taylor, Albert J., and Dykes, Norman L. Sun . "Composition and method for brazing graphite to graphite". United States. https://www.osti.gov/servlets/purl/864895.
@article{osti_864895,
title = {Composition and method for brazing graphite to graphite},
author = {Taylor, Albert J. and Dykes, Norman L.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {1}
}

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