Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1982-08-10
1984-02-21
Simmons, David A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156325, 156335, 428408, 428420, 524301, 524413, 524430, 524779, 524783, C03B 2900, C04B 3334, C04B 3700
Patent
active
044328214
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 the strength and other properties of the graphite.
REFERENCES:
patent: 1188439 (1916-06-01), Goldsmith
patent: 2979813 (1961-04-01), Steinberg
patent: 2979814 (1961-04-01), Steinberg
patent: 3946932 (1976-03-01), Peterson
Dykes Norman L.
Taylor Albert J.
Besha Richard G.
Hamel Stephen D.
Heitbrink Timothy W.
Larcher Earl L.
Simmons David A.
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