Controlled atmosphere processing of TiB.sub.2 /carbon composites
AssigneeGreat Lakes Carbon Corporation
InventorsLouis A. Joo, Kenneth W. Tucker, Scott D. Webb
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Abstract
TiB.sub.2 -carbon composites are produced by mixing the raw materials comprised of carbon, TiB.sub.2, pitch, and other reactants, forming a shaped article, processing in a nitrogen atmosphere up to 2100.degree. C., and in a noble gas above 2100.degree. C.
Claims8
In a process for the production of an article comprising a refractory hard metal, the improvement comprising processing said article in an atmosphere of nitrogen at temperatures rising to 2100.degree. C., and processing said article in an atmosphere of noble gas at temperatures rising to above 2100.degree. C.
In a process for the production of an article comprising a refractory hard metal, the improvement comprising the use of a nitrogen atmosphere at temperatures up to about 2100.degree. C., purging said atmosphere with a noble gas, and maintaining a noble gas atmosphere up to a final temperature above 2100.degree. C.
In a process for the production of a cathodic component for a Hall cell comprising TiB.sub.2 wherein said component is heated to a temperature of 2000.degree. C. or higher, the improvement comprising the use of a nitrogen atmosphere when heating said component up to about 2100.degree. C., and the use of an argon atmosphere when heating said component at temperatures rising to above 2100.degree. C.
Dependencies are inferred from the claim text.