Preparation method of carbon/carbon composite material flat plate with carbide coating on surface

The invention discloses a preparation method of a carbon/carbon composite material flat plate with a carbide coating on the surface. The preparation method is characterized by comprising the following steps of: A, alternately superposing plain carbon cloth or twilled carbon cloth with a short carbon fiber net blank and needling on a knitting machine to form quasi-three-dimensional needled integrated felt; B, performing warm-pressing preforming on the integrated felt on a flat plate machine to obtain a flat plate preformed body with the density of 0.50 to 0.75 g/cm ; C, placing the flat plate preformed body into a chemical vapor deposition furnace and densifying to obtain a carbon/carbon composite material flat plate with the density of 1.35 to 1.55 g/cm ; D, placing the densified flat plate into a high-temperature graphitization furnace and performing treatment at 2,200 DEG C for 2 hours; E, placing the flat plate subjected to high-temperature graphitization treatment on a lathe and cutting into a flat plate