Chemistry: electrical and wave energy – Processes and products
Patent
1993-10-26
1994-08-23
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
205230, C25C 306, C25D 366
Patent
active
053404483
ABSTRACT:
An adherent protective coating of a refractory material is produced on the surface of carbonaceous, refractory, ceramic, metallic or other materials serving as components of electrolytic cells operating at high temperature, by applying to such surfaces a well chosen micropyretic reaction layer from a slurry, which when dried is ignited to initiate a self-sustaining micropyretic reaction, along a combustion front, to produce condensed matter forming such refractory protective adherent coating. The slurry is preferably applied in several layers, the first layer(s) to facilitate adherence and the last layer(s) to provide protection and may contain some preformed non-reactant materials. The electrolytic cells whose components require such coatings are especially those operating at high temperature with a molten salt electrolyte, particularly those for the production of metals, aluminum being the most important. For these cells the invention provides an aluminum-wettable, adherent, refractory, protective coating for the cell-bottom carbon cathode, containing RHM material such as titanium diboride, as well as other refractory protective coatings for cell wall lining and for other cell components. Novel cell designs for the utilization of the different coatings are also provided.
REFERENCES:
patent: 4614569 (1986-09-01), Duruz et al.
patent: 5158655 (1992-10-01), Townsend
patent: 5217583 (1993-06-01), Sekhar et al.
patent: 5279715 (1994-06-01), LaCamera et al.
De Nora Vittorio
Sekhar Jainagesh
Moltech Invent S.A.
Valentine Donald R.
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