Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1980-11-05
1982-06-08
Gantz, Delbert E.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204294, 204291, 428367, 428408, 428688, 427113, 428697, C25C 308, B32B 904, B05D 512
Patent
active
043338135
ABSTRACT:
This invention concerns cathodes for alumina reduction cells, particularly drained cathodes, which present a refractory surface for contacting molten aluminum on the cell floor. This invention also concerns materials for constructing such cathodes.
The cathodes described comprise a carbonaceous bed, preferably a graphite bed, and a composite tile. This tile is characterized by a layer of a refractory hard metal (RHM) material bonded to a base layer of a graphitic material, where the RHM layer comprises a hot pressed mixture of titanium diboride and aluminum nitride powders. The tile is further characterized by the bond between the RHM layer and the graphitic base layer, such bond having been produced simultaneously as the RHM layer is formed by hot pressing the mixture of titanium diboride and aluminum nitride powders directly against the graphitic base layer. The graphitic base layer is in turn bonded to the carbonaceous bed by means of a carbonaceous cement, and the RHM layer thereby provides a refractory surface for contacting molten aluminum.
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Bryce Jerry H.
Johnston Thomas J.
Kaplan Howard I.
McMinn Curtis J.
Richards Nolan E.
Gantz Delbert E.
Reynolds Metals Company
Valentine Donald R.
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