NEW PRODUCTION OF CARBON MATERIAL COATED WITH METAL OXIDE

• Main Authors: KATO SHUNSAKU, RI SHINKO
• Format: Patent
• Language: English
• Published: 30.01.2001
• Edition: 7
• Subjects: CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS THEREOF; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; INORGANIC CHEMISTRY; LAUNDERING; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; METALLURGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRINTED CIRCUITS; TEXTILES; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF TEXTILES OR THE LIKE; TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS,FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS

PROBLEM TO BE SOLVED: To produce a carbon material, e.g. carbon fibers coated with a ceramic material and expected to fine wide application to new fields of a composite material, an electronic material, etc., by a relatively low temperature energy- saving method. SOLUTION: An aqueous solution containing urea and metalic salts and a carbon material are put in a microwave transmissive vessel and irradiated with microwaves under pressure to uniformly precipitate metal oxides and multiple metal oxides onto the surface of the carbon. The metal oxides are ferromagnetic oxides and their multiple oxides and may be selected from iron oxide and ferrites that the iron multiple oxides. Reaction is carried out under microwave-hydrothermal conditions of <=200 deg.C reaction temperature, several atm to 30 atm pressure and several min to about 1 hr reaction time.