▎ 摘　　要

NOVELTY - The methodic involves using continuous carbon fiber as toughening phase, and combining design size of gas rudder to prepare a primary preform of gas rudder. An ultrasonic-assisted vacuum impregnation method is used to prepare a graphene interface phase on the surface of carbon fibers in the primary preform to obtain a secondary preform. The obtained secondary preform is densified by a directional flow immersion solidification-pyrolysis process, and silicon carbide nanowires are introduced in combination with a chemical vapor deposition process to obtain a matrix group multi-scale reinforced ceramic matrix composite gas rudder blank with gradient distribution. The obtained gas rudder blank is machined to the size of the gas rudder structure. USE - Preparation method of multi-scale reinforced gradient ceramic-based composite gas rudder for use in aircraft. ADVANTAGE - The method shortens the preparation period of the ceramic-based composite gas rudder, and prepares the light high-strength and ablation-resistant gas- rudder. The method introduces the graphene interface phase with excellent mechanical property and thermal physical property between the fiber and the substrate, and introduces graphene interface to effectively increase the specific surface area, thus improving the wettability between the fibre and the surface of the substrate. The carbon fiber is used to prepare the first-level prefabricated body of the rudder without the rest ceramic base composite material, so that the carbon fiber can be used as toughening material, thus reducing the production cost of rudder and increasing the production efficiency.