| 摘要 |
FIELD: metallurgy. ^ SUBSTANCE: invention can be used as fillers of composite materials of structure, heat protecting, anti-electro-static purpose and also at production of carbon fibrous adsorbents, catalyst carriers, materials for protection from electro-magnetic radiation, nano structured composite, fullerenes, nano tubes etc. The procedure consists in impregnation of a source unidirectional braid with solution of fire retardant. Braid is made of hydrated cellulose fibres with fine crystal non-tensioned structure with diametre of filament from 8.5 to 15 mcm at its linear density 0.07-0.17 tex. Further, the procedure consists in drying, non-oxidation stabilising carbonisation and graphitisation. As a fire retardant there is used water solution containing 150-200 g/l of ammonia chloride and 10-30 g/l of urea or water solution containing 250-300 g/l of ammonia sulphate and 20-40 g/l of urea. Drying is carried out by electric heating at 120-140C during 30-60 min. Before carbonisation braid is treated in oxygen containing atmosphere at 140-180C during 30-90 min. Multi-zone carbonisation is performed in current of inert medium at rate 2.5-4.5 m3/hour during 40-80 min for 5-10 min in each zone with shrinkage of source hydrated cellulose fibre at 10-30 % and at temperature from 170-230C to 690-710C. During carbonisation products of pyrolysis in a zone of their highest release are withdrawn due to a low excessive pressure of neutral gas of 120-150 mm of water column at continuous oxidation in spots of combustion. Graphitisation is carried out at 1000-2400C in medium of nitrogen or argon with contents of oxygen not over 0.001% at rate of drawing 15-50 m/hour. ^ EFFECT: reduced duration of process, considerable reduction of humidity of produced carbon fibre, multi-zone carbonisation with guaranteed maintenance of uniform temperature of each zone, reduced release of amorphous carbon as product of resin decomposition and prevention of its settling on surface of produced carbon fibre. ^ 7 cl, 2 ex |
