METHOD OF MANUFACTURING HERMETIC PRODUCTS FROM CARBON-CARBIDESILICON MATERIALS Russian patent published in 2015 - IPC C04B35/577 C04B35/532 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of manufacturing hermetic products from carbon-carbidesilicon materials (CCSM), intended for work in the chemical, chemical-metallurgic and other fields of industry. The method includes the formation of a frame from carbon fibres, which have LTEC 3-3.5×10^-6 degree^-1, its compaction with pyrolytic carbon to the 30-50% weight gain, or application in its formation of carbon fibres or fabric with a formed on them pyrocarbon coating with the formation of a workpiece from a porous carbon-carbon material. Then, coke and silicon are introduced into the pores of such workpiece in portions, for at least two times, with the alteration of their introduction. Coke is introduced by soaking with a coke-forming binding agent, with its further solidification and carbonisation. Introduction of silicon at intermediate stages is realised by the condensation of silicon vapours in the pores of the workpiece material in the process of heating and exposure of the workpiece and crucibles with silicon at a temperature on the silicicated workpiece of 1300-1650°C with further heating to 1800°C, exposure at 1800-1850°C for 1-2 hours and cooling under conditions, which exclude the condensation of the silicon vapours in the pores of the material, and the introduction of silicon at the final stage of siliciding - by the condensation of the silicon vapours in the pores of the material in the period of temperature growth and/or final cooling from 1800-1850°C.

EFFECT: increase of the service term of the hermetic products from CCSM in oxidative media at high temperatures.

5 cl, 20 ex, 3 tbl