GRAPHITE FOIL, SHEET MATERIAL BASED THEREON, SEAL AND METHOD OF PRODUCING Russian patent published in 2019 - IPC C01B32/225 C04B35/536 F16J15/3292 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to the technology of coal-graphite materials. To obtain graphite foil with improved sealing properties, intercalated graphite is first obtained, which is then heated in thermal shock to produce a semi-product containing thermally expanded graphite and amorphous carbon. Heating is carried out at temperatures providing maximum value of ratio I_D/I_G depending on oxidation depth, where I_G and I_D – peaks of scattered radiation intensity in the frequency range of 1,500–1,630 cm^-1 and 1,305–1,395 cm^-1 respectively, for graphite and amorphous carbon, measured by Raman spectroscopy depending on the depth of oxidation of said intercalated graphite. Maximum value of ratio I_D/I_G for each oxidation depth is greater than or equal to 0.05. Said semi-product is subjected to compression to produce target product – graphite foil. Sheet material, which is a laminate, is made based on said foil, and comprises metal foil, tape or mesh. A flanged or gland seal is obtained from said foil.

EFFECT: group of inventions improves air-tightness.

15 cl, 3 dwg, 1 tbl, 3 ex