FIELD: chemical technology. SUBSTANCE: polyboroncarbosilanes were synthesized by pyrolysis of polyorganosilanes of the general formula 
where R1 and R2 - Me, Et, Ph, n≥6 at 250-390 C in the presence of boron-containing compound taken from the group involving [(C2B, H11)2M]n/Zm,, (C5H5)M(C2B9H11) where M - Fe, Co, Ni, Cr; Z - K, Na, Cs, Fe, Co, N(CH3); n = 1-2; m = 0-1, or 
where R3 and R4 - H, Me, Et, Pr, iPr, Ph, 
; M - Li, K, Na, Cs; Z - 0-1 at concentration 0.01-5% of polyorganosilanes mass. Strength of carbidesilicon fibers is increased up to 65-100 kgf/mm2. EFFECT: enhanced quality of products. 2 tbl
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