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

FIELD: chemistry.

SUBSTANCE: method includes forming a frame of silicon carbide fibres having in their structure free carbon and oxygen bonded with silicon atoms; packing the frame with a coke-pyrocarbon matrix until its content is 0.9-1.5 times the content of oxygen in the silicon carbide fibres with respect to the density of a plastic workpiece; siliconising the obtained workpiece in a vacuum using a vapour-liquid phase method by heating and cooling in silicon vapour, alternating with additional partial packing of the porous workpiece with the coke-pyrocarbon matrix. The feeding of silicon into the pores of the workpiece material during siliconisation and the coke-pyrocarbon matrix during partial packing of the material is carried out in portions in at least two steps. At the first step of feeding silicon into the pores of the material, the workpiece is heated to 1300-1500°C and to 1600-1700°C the next steps. Siliconisation at least the first step is carried out by capillary condensation of silicon vapour. The next feeding of the coke-pyrocarbon matrix into the pores of the material, wherein content of the coke-pyrocarbon matrix before the first siliconisation step is 0.9-1.2 times the content of oxygen in the silicon carbide fibres, is carried out via partial packing with pyrocarbon before saturation with coke-forming binder, followed by carbonisation.

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

3 cl, 22 ex, 1 tbl