Method of reshaping warped graphite enclosures and the like

Details Method of reshaping warped graphite enclosures and the like Method of reshaping warped graphite enclosures and the like

C - Chemistry, Metallurgy

30

B

148/1.4

C30B 15/10 (2006.01) B23P 6/00 (2006.01) C30B 15/14 (2006.01)

Patent

CA 1143257

METHOD OF RESHAPING WARPED GRAPHITE ENCLOSURES AND THE LIKE ABSTRACT OF THE INVENTION Warped, spread apart, graphite enclosures of the type used with crucibles for "pulling" crystalline bodies, and the like are restored substantially to origi- nal "set" condition by compressing them and holding them in substantially their original shape while heating them to temperatures which result in vaporization of the crys- talline material and the carbon compounds which have de- posited or formed on the enclosure, holding them at the elevated temperatures for a period of time sufficient to volatilize,and permit removal of all, save perhaps a minor residuum, of these materials, and then cooling the enclo- sure. Alternatively, the heating can be accomplished in a reactive furnace which also reacts a halogen or the like with the material to be removed.

354526

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