FIELD: chemistry.
SUBSTANCE: method includes the step of chemical processing the filaments with an aqueous acid solution containing hydrofluoric acid and nitric acid at a temperature of 10-30°C to remove the silicon dioxide that is present on the surface of the filaments and to form a layer of microporous carbon. This aqueous solution contains hydrofluoric acid in an amount of 0.5-4 mol/l and nitric acid in an amount of 0.5-5 mol/l, wherein the molar ratio of HF/HNO3 is less than 1.5. The invention also relates to a method of producing a fibrous preform comprising forming a fibrous structure comprising treated filaments of silicon carbide and applying the said blank to produce a part made of a composite material.
EFFECT: improving the surface of the filaments for subsequent binding to pyrolytic carbon.
12 cl, 2 dwg, 6 ex
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