NANOSTRUCTURED CERAMIC MATRIX COMPOSITE MATERIAL AND METHOD OF PRODUCING SAID MATERIAL

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to machine engineering ceramics, particularly ceramic matrix composite material based on silicon carbide and reinforced with carbon fibre. The composite material contains a matrix of reaction-sintered silicon carbide, reinforced with bundles of carbon filaments, separated from the matrix by a barrier layer. The filaments in the bundles are joined to each other by a dense sintered nanosize inter-filament phase which contains carbon, silicon, boron, nitrogen, as well as aluminium and yttrium oxide compounds. The barrier layer and the inter-filament phase do not contain free carbon. The method of producing the composite material involves pre-treatment of the bundles of carbon filaments with a suspension which contains polymer binder and nanoparticles of silicon nitride, aluminium and yttrium oxide compounds and at least one component selected from: boron, silicon, boron or silicon compound. After drying, the fibre mass is saturated with coke-forming binder which contains silicon carbide particles, the workpiece is moulded, the binder is cured, followed by a carbonisation step, synthesis and sintering of the inter-filament phase, and then a step for saturating the workpiece with solutions or melts of coke-forming polymers and silicification.;EFFECT: obtaining material with high characteristic strength and impact viscosity.;8 cl, 1 tbl, 2 dwg