FIELD: process engineering.
SUBSTANCE: invention relates to production of high-modulus carbon fibers made in PAN yarns used in fabrication of high-quality composites. In compliance with proposed method, initial PAN yarn with the number of filaments varying from 3K to 24K and made from copolymer containing at least 85% of PAN is subjected to preliminary twisting to 10 to 20 twist per metre and oxidised in air to density of 1.39 to 1.43 g/cm3. Then yarn is, again, subjected to twisting to 30 to 60 twist per metre and carbonised in two steps in neutral medium. First stage of carbonisation is performed at 2100°C to 2500°C till yarn elastic modulus of 300 GPa, while second stage is carried out at up to 3000°C.
EFFECT: avoiding entanglement of adjacent yarns, producing high-quality carbon yarns of various linear density.
1 ex
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