Heat treatment of molten carbonaceous material prior to its conversion to carbon fibers and other shapes
Abstract
Abstract A METHOD IS PROVIDED FOR THE PRODUCTION OF CARBON SHAPED ARTICLES IN THE FORM OF FILAMENTS, YARNS, RIBBONS, FILMS, SHEETS, TUBES AND THE LIKE. THE SHAPED ARTICLES RESULTING FROM THE PROCESS ARE LIKEWISE PROVIDED. THE METHOD COMPRISES THE STEPS OF (A) HEATING A NATURAL OR SYNTHETIC ORGANIC SUBSTANCE SUCH AS POLYVINYL CHLORIDE, POLYACRYLONITRILE, PETROLEUM PITCH, COAL PITCH AND OTHERS, IN THE PRESENCE OF AN INERT GAS TO A TEMPERATURE IN THE RANGE OF ABOUT 300* TO 500*C., WHICH TEMPERATURE IS BELOW THE CARBONIZATION TEMPERATURE OF SUCH SUBSTANCE, (B) BRINGING THE TEMPERATURE OF THE SUBSTANCE TO A TEMPERATURE BELOW THE CARBONIZATION TEMPERATURE IN AN INERT ATMOSPHERE AND FORMING THE SUBSTANCE (IN AN INERT ATMOSPHERE) INTO AS DESIRED SHAPE, (C) CONTACTING THE SHAPED ARTICLE WITH AN OXIDIZING GAS, AND (D) SUBJECTING THE ARTICLE TO CARBONIZATION BY HEATING IN AN INERT ATMOSPHERE AT A TEMPERATURE SUBSTANTIALLY ABOVE 500*C. THE SHAPED ARTICLES ARE USEFUL FOR A WIDE RANGE OF USES, AS FOR EXAMPLE, THERMAL INSULATION MATERIALS, CARBON ELECTRODES, AND THE LIKE.
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