The invention discloses a fast connection method of a carbon / carbon
composite material. The method includes the steps of: (1) preparation of an X-Si (X=Ni, Co, Ti or Cr)
alloy paste; (2) pretreatment of the carbon / carbon
composite material; (3) pretreatment of a middle layer
metal sheet (including Mo or Ti sheet); (4)
coating of a
composite material connection surface with the X-Si
alloy paste; and (5) assembling and quick connection: arranging two X-Si
alloy coatings and one middle layer
metal sheet in the middle of the connection surface of two carbon / carbon composite components so as to form an X-Si / middle layer
metal sheet / X-Si sandwich structure, with the Si atomic percentage content of the X-Si alloy being 40-80%, under the conditions of 10-40MPa pressure assembling, vacuum protection and a heating rate of 100-300DEG C / min, conducting heating to 1200-1600DEG C, and performing heat preservation for 1-10min. The method disclosed in the invention can realize
liquid phase connection of carbon / carbon composite materials. The process is simple, and the prepared connecting piece has a reliable structure and can be used in
load bearing and high temperature application occasions.