METHOD OF MAKING ARTICLES FROM COMPOSITE MATERIAL WITH HARDENED REINFORCING ELEMENT AND MATRIX (EMBODIMENTS) Russian patent published in 2020 - IPC C04B35/83 C04B35/577 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of making articles from carbon-silicon carbide composite materials intended for use in oxidative medium at high temperatures. According to the method, structure frame 2.5 d is formed on the basis of fabric blanks of long-length heat-resistant fibres of carbon and silicon carbide type. When tying a stack of fabric pieces between them, cellulose paper is laid. Packet of required thickness is pierced with carbon or silicon carbide thread and impregnated with aqueous solution of compound which catalyses growth process of carbon nanotubes or fibres. Then the frame is dried and impregnated with coke-forming binder, after which a plastic billet is formed, thus giving shape and dimensions to the future product. Produced plastic workpiece is carbonized in inert medium at heating to 800–850 °C, providing formation of coke and growth of carbon nanotubes or fibres in inter-fibre pores of the frame and in inter-fibre pores of fibres, as well as in pores of coke. Then, if necessary, billet from carbonized plastic is subjected to high-temperature treatment and saturated with pyrocarbon. To obtain a silicon carbide matrix, the workpiece is silicated with a vapour-liquid-phase method.

EFFECT: technical result is improved operational characteristics of thin-walled, large-size and complex products.

3 cl, 1 tbl, 7 ex