METHOD OF MAKING ARTICLES FROM CARBON-SILICON CARBIDE MATERIAL Russian patent published in 2012 - IPC C04B35/577 C04B35/573 C04B35/80 

FIELD: chemistry.

SUBSTANCE: invention relates to structural materials operating in conditions of high thermal load and oxidative medium, and can be used in chemical and metallurgical industry, as well as aircraft engineering. The method involves making a carbon-plastic workpiece based on carbon fibre and thermoreactive binder, thermal treatment thereof until formation of a coke matrix reinforced with carbon fibres, subsequent compacting of the coke matrix via saturation with pyrolytic carbon and silicon impregnation. Saturation with pyrolytic carbon is carried out until achieving intermediate density of the carbon workpiece of 78-87% of the maximum apparent density of the carbon material, after which preliminary silicon impregnation at temperature 1500-1650°C and residual pressure 1-36 mm Hg is carried out, with subsequent distillation of free Si at temperature 1800-1850°C and residual pressure 1-36 mm Hg, and the material is then impregnated with coke binder, carbonised and subjected to final silicon impregnation using a vapour-phase technique.

EFFECT: obtaining carbon-silicon carbide material with high content of SiC (>30 wt %) and low content of free silicon, having high stability of shape and possibility of prolonged operation in an oxidative medium at temperature 1600-1800°C.

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