JPS6228120B

• Main Authors: SAKAI KUNIO, NEGI KAZUYA, AOSHIMA ATSUSHI, SAITO TAKESHIRO
• Format: Patent
• Language: English
• Published: 18.06.1987
• Subjects: AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; APPARATUS THEREFOR; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS THEREOF; CRYSTAL GROWTH; INORGANIC CHEMISTRY; METALLURGY; NATURAL OR ARTIFICIAL THREADS OR FIBRES; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; REFINING BY ZONE-MELTING OF MATERIAL; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; SINGLE-CRYSTAL-GROWTH; SPINNING; TEXTILES; THEIR RELEVANT APPARATUS; TRANSPORTING; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL

PURPOSE:To directly manufacture high-grade carbonaceous whiskers from a vapor phase in a high yield by contacting a catalyst practically in a finely dispersed state to a hydrocarbon gas under an oxidizing atmosphere in a predetermined temp. range. CONSTITUTION:Under an oxidizing atmosphere a known catalyst such as Fe, Co, transistion metal or a compound thereof practically in a finely dispersed state is contacted to a hydrocarbon gas such as methane at 900-1,600 deg.C to manufacture carbonaceous whishkers. To form the oxidizing atmosphere CO2 gas acting as an oxidizing gas especially at high temp. is preferably used, and the atmosphere is adjusted to 0.05-5l as CO2 gas to 1l of the starting material gas. As a result, whiskers are formed very efficiently, and the practical number of whiskers formed is 10-100 times as many as that of whiskers foemed by a conventinal method.