METHOD OF MAKING ARTICLES FROM COMPOSITE MATERIAL Russian patent published in 2015 - IPC C04B35/573 C04B35/577 C04B35/80 

FIELD: chemistry.

SUBSTANCE: invention relates to composite materials with the composition SiC/C-SiC-Si, which are designed to operate in oxidative media and under mechanical load at high temperatures. The method includes forming a frame of silicon carbide fibres having in their structure free carbon and oxygen bonded to silicon; packing the frame with a coke-pyrocarbon matrix until its content is 0.9-1.7 times the content of oxygen in the silicon carbide fibres with respect to the density of a plastic workpiece. The obtained workpiece is the heat treated at 1300-1500°C. In the preferred version of the method, heat treatment is carried out at atmospheric pressure in a medium of argon and/or especially pure nitrogen or in silicon monoxide vapour. Before siliconisation, the workpiece is partially packed with pyrocarbon and/or impregnated with coke-forming binder followed by carbonisation to obtain material with open porosity of 20-30% and density higher than 1.5 g/cm³, if said characteristics are not satisfied. Siliconisation is carried out using a vapour-liquid-phase method by impregnating the material with silicon vapour condensate.

EFFECT: longer service life of articles in oxidative media and mechanical loads at high temperatures.

7 cl, 1 tbl, 26 ex