Dense cermets containing fine grained ceramics and their manufac

Details Dense cermets containing fine grained ceramics and their manufac Dense cermets containing fine grained ceramics and their manufac

1984-06-29

1986-09-09

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75234, 75235, 75244, 75254, 204242, 204292, 419 12, 419 19, 419 23, 419 38, 419 39, 419 42, 419 45, 419 57, 419 66, 419 68, C22C 2912

Patent

active

046107266

ABSTRACT:
A cermet is produced by providing a bulk reaction mixture of particulate reactants plus elemental metal, which reaction mixture is in admixture with a ceramic diluent that is the same as ceramic material formed during sintering of the reaction mixture. Sintering produces a boride-oxide ceramic with the oxide being a metal oxide of the elemental metal. However, the elemental metal is present in the reaction mixture in substantial excess over that amount stoichiometrically required. Sintering is conducted under inert atmosphere, generally after pressing. The invention is particularly directed to boride-based ceramics containing aluminum, which materials are suitable as components of electrolytic cells for the production of aluminum by molten salt electrolysis.

REFERENCES:
patent: 4022584 (1977-05-01), Rudy
patent: 4381931 (1983-05-01), Hunold et al.
patent: 4431448 (1984-02-01), Merzhanov et al.
patent: 4492670 (1985-01-01), Mizrah et al.
patent: 4528120 (1985-07-01), Hunold et al.
patent: 4540475 (1985-09-01), DeAngelis
U.S. patent application Ser. No. 454,671, 12301982, DeAngelis.
U.S. patent application Ser. No. 454,718, 12301982, Sane.
U.S. patent application Ser. No. 580,532, 02151984, Fresnel.

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