CARBON-CERAMIC FIBER-REINFORCED COMPOSITE MATERIAL AND METHOD FOR ITS OBTAINING Russian patent published in 2019 - IPC C04B35/577 C04B35/573 C04B35/65 B82Y40/00 

FIELD: manufacturing technology.

SUBSTANCE: present invention relates to a class of carbon-based composite materials for heat-shielding, structural, chemical-resistant purposes, subject to operation in conditions of static and dynamic loads when heated to 2,000 °C in an oxidizing environment (aerospace engineering, high-temperature electrothermal equipment, equipment for nuclear reactors, etc.), as well as to methods for their preparation. Carbon ceramic composite material includes a ceramic matrix reinforced with carbon fiber material. At the same time, the matrix ceramic material is additionally reinforced with carbon nanotubes and additionally contains along the interface between the phases of the nanostructured matrix and carbon fiber reinforcing nanostructured silicon carbide interphase in the following ratio, wt.%: carbon nanotubes 0.3–1.0, carbon fiber materials 15–25, nanostructured silicon carbide interphase 2–4, silicon carbide – the rest. Carbon fiber filler is impregnated with a mixture of non-coking and coking forming oligomeric resins, placed between the transport and separation polyethylene films and subjected to ionizing radiation, which partially polymerize non-coking resin. From the prepreg layers, a billet package of a bulk structure is formed, molding, carbonization, impregnation with a solution of polycarbosilane in toluene, drying, thermal stabilization, ceramization and siliconization are carried out. Before placing the impregnated carbon fiber filler onto the transport and separation polyethylene films, a layer (2–10) % of carbon nanotube suspension in a mixture of coke-forming oligomeric and non-coking resins is applied. When laying out a package of CFRP blanks, carbon nanotubes are poured into each of the prepreg layers through a removable perforated plate, which is in direct close contact with the prepreg layer that is laid out, repeating its dimensions. After carbonization, the resulting carbon-carbon preform is additionally compacted by impregnation in (2–10) % suspension of carbon nanotubes in a solution of polycarbosilane in toluene.

EFFECT: increase the strength of the composite up to 40 % in terms of flexural strength and twice in terms of compressive strength.

4 cl, 4 dwg, 2 tbl