METHOD OF PRODUCING SEALED PRODUCTS FROM COMPOSITE MATERIALS Russian patent published in 2017 - IPC B32B27/04 B32B27/12 C04B35/532 C04B35/505 C04B35/83 B82Y30/00 

FIELD: technological processes.

SUBSTANCE: method includes the manufacture of an inner shell of composite material (CM), the formation of a hermetic coating thereon, the manufacture of an outer shell of CM based on the same type of reinforcing fibers as the inner shell CM, and high-modulus high-strength carbon fibers are used. The inner shell is made of carbon-silicon carbide composite material that does not contain free silicon. As a composition, when forming a hermetic coating, a suspension is used which is based on a binder, i.e. a solution of organo-yttrium-oxane-lumoxane siloxane, and a filler, i.e. a mixture of finely divided refractory powders , Y₂O₃, SiO₂ or Al₂O₃, Y₂O₃, HfO₂, SiO₂. The coating is formed by lamination of the suspension interchanging with drying and further heat treatment at 1600°C. The outer shell is produced over the barrier coating formed on top the tight oxide coating. The shell is manufactured in the following sequence: a frame is formed and then impregnated with a coke-forming and/or polycarbosilane binder. Next, a carbon fiber reinforced plastic billet is made, subjected to carbonization and compacted to the maximum possible density by pyrocarbon using the vacuum isothermal method or compacted to intermediate density by pyrocarbon. Nanocarbon is grown in the pores of the material and silicated by the vapour-liquid phase method with the mass transfer of silicon into the pores of the material via the mechanism of capillary condensation of its vapours in the range of 1300-1500°C and the subsequent exposure at a temperature of 1550-1600°C.

EFFECT: providing a possibility of reducing the weight of manufactured products designed to work under excessive pressure at high temperatures and in the presence of an oxidizing environment.

4 cl, 10 ex