FIELD: metallurgy, technical fibers. SUBSTANCE: polyacrylonitrile fiber oxidized up to the density 1.36-1.40 g/g/cm3 is carbonized in neutral medium. Then fiber is impregnated with aqueous solution containing, wt.-%: boric acid 5-10, and sodium tetraborate hydrate 5-10. Material is dried by thermal impact at 150-250 C and graphitized. EFFECT: improved method of fiber making. 1 tbl
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