METHOD OF SILICONIZING LARGE-SIZE ARTICLES AND A RETORT OF A DEVICE FOR ITS IMPLEMENTATION WITH SEAMS OF LOW PERMEABILITY Russian patent published in 2019 - IPC C23C10/22 C23C10/44 

FIELD: manufacturing technology.

SUBSTANCE: invention is intended for production of items from carbon-silicon-carbide composite materials. Method of siliconizing large-size articles from carbon-carbon composite material includes placing an article with a slurry coating formed on it based on silicon or its precursor and/or crucible with silicon in a closed-volume retort for siliconizing large-size articles, removal of reactor gases from retort by vacuuming and/or supply of inert gas, heating of article or article and crucible with silicon in vacuum and/or at atmospheric pressure in silicon vapor at temperature of vapors exceeding temperature of siliconized article, cooling in vacuum in silicon vapors or in vacuum or at atmospheric pressure in absence of silicon vapors, separation of retort parts and removal of article from retort. When placing article or article and crucibles with silicon in closed volume retort between parts of retort is installed on heat-resistant adhesive of spacer from heat-resistant material of low permeability and treated with metalwork tool, vacuuming and/or supply of inert gas to the retort until atmospheric pressure is provided is carried out through the central opening in the retort cover, the following heating and cooling until the retort parts disconnection is carried out with low permeability of joints between the retort parts, and its parts are separated by a metalwork tool by cutting intermediate spacers along the thickness. Retort of closed volume for siliconizing of large items from carbon-carbon composite material consists of several parts in height made from pre-sealed carbon-carbon composite material and cover. Retort is additionally equipped with spacers arranged between its parts and connected to them for heat-resistant glazing from graphite subjected to sealing or from material obtained by pressing graphite foil with orientation of its layers parallel to the retort axis, and the retort cover has a central hole.

EFFECT: high probability of obtaining stably high results on the degree of uniformity of siliconizing of large-size workpieces with high purity of the surface of the siliconized workpieces, high controllability of the siliconizing process and low costs for carrying it out.

4 cl, 4 dwg