METHOD OF MAKING ARTICLES FROM CERAMIC-MATRIX COMPOSITE MATERIAL Russian patent published in 2015 - IPC C04B35/577 C04B35/573 C04B35/65 

FIELD: chemistry.

SUBSTANCE: method of making articles from ceramic-matrix composite material includes forming a frame from carbon or silicon carbide fibres, partial packing of the frame with a carbon-ceramic matrix material using corresponding precursors and siliconising the obtained workpiece. The frame is first soaked with a ceramic-forming polymer, which is a silicon nitride and/or carbide precursor; a plastic workpiece is formed at the curing temperature of the binder, heat treated at final temperature of 1300-1600°C, after which carbon is fed into the pores of the material, for example by partial packing with pyrocarbon and/or soaking with a coke-forming polymer and carbonisation, and/or by carbonisation of the pores with catalytic carbon. Siliconising is carried out via a vapour-liquid phase method by heating, holding at 1600-1700°C for 1-3 hours and cooling in silicon vapour. Before soaking the frame with the ceramic-forming polymer, a gas-phase coating is formed on refractory fibres, the coating being selected from pyrocarbon, silicon carbide and boron nitride.

EFFECT: higher performance of articles made from ceramic-matrix composite material under thermal and mechanical load in an oxidative medium.

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