Plastic and nonmetallic article shaping or treating: processes – Gas or vapor deposition of article forming material onto...
Patent
1979-07-09
1981-03-31
Welsh, Maurice J.
Plastic and nonmetallic article shaping or treating: processes
Gas or vapor deposition of article forming material onto...
264 82, 264234, 264235, 428408, F27B 1410
Patent
active
042592780
ABSTRACT:
Warped, spread apart, graphite enclosures of the type used with crucibles for "pulling" crystalline bodies, and the like are restored substantially to original "set" condition by compressing them and holding them in substantially their original shape while heating them to temperatures which result in vaporization of the crystalline material and the carbon compounds which have deposited 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 enclosure. Alternatively, the heating can be accomplished in a reactive furnace which also reacts a halogen or the like with the material to be removed.
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Anthony Robert J.
Flegel Vernon
Ultra Carbon Corporation
Welsh Maurice J.
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