FIELD: manufacturing technology.
SUBSTANCE: invention can be used in making structures from composite materials. Connection element of hollow hermetic product of integral structure is made of CCCM based on low-modulus carbon fibers and comprises connecting end section 1 and metal tip equipped with bellows. First, frame of woven structure made from carbon tie based on low-modulus carbon fibers is formed on mandrel-heater 8 except for sections 1 and 2a, on which layers of fabric are left unconnected. On section 1 layers of fabric are flanged on flange section 9. Then, obtained frame is saturated with pyrocarbon by thermogradient method, supplying current with top 10 and bottom 11 current leads to mandrel-heater 8. Complete saturation of the frame by pyrocarbon is carried out at such a length from the beginning of section 1, at which its elongation is approximately equal to elongation of the metal tip. After that, the section completely pyro-carbon-treated is mechanically treated for formation of a slurry coating based on fine graphite powder and a temporary binder and from one of its ends groove for metal tip is made, depth of which should be sufficient for rigid and sealed connection of CCCM and tip. On one of the tip sections an anti-adhesion coating is formed, the first layer of which is made of graphite foil, and the second one – from fluoroplastic or cellophane. Other end of the tip is glued onto the heat-resistant adhesive into the made groove. Then unsaturated and not compacted pyrocarbon sections are impregnated with coke-forming binder, then in single process section 2 is sealed, carbonization and saturation with pyrocarbon in vacuum.
EFFECT: provides tightness of the product of integral design, separate elements of which are made from materials with different coefficients of thermal expansion and during its operation are in different temperature zones.
2 cl, 3 dwg
