Method for compacting carbon/carbon composite material by using natural gas mixture CVI (Chemical Vapor Infiltration)

The invention discloses a method for compacting carbon/carbon composite materials by using natural gas mixture CVI (Chemical Vapor Infiltration), comprising the following steps of: firstly, loading a porous carbon-fiber perform into a high-temperature processing furnace to process at high temperature; secondly, loading the high-temperature processed porous carbon-fiber perform into a deposition furnace, vacuumizing the deposition furnace to empty air in the deposition furnace, and stopping vacuumizing when pressure meets a requirement in the deposition furnace; thirdly, electrifying and heating the deposition furnace, restarting a vacuum system to vacuumize, and introducing natural gas mixture as a precursor to carry out compaction treatment by using CVI; and fourthly, taking out a product after cooling. The invention has simple technology, low cost and high carbon deposition efficiency, is not easy to generate a crust on the surface of the carbon/carbon composite material, and is beneficial to reduce the pro