▎ 摘　　要

NOVELTY - Method for preparing high temperature resistant reinforced and toughened oxide/oxide composite material, involves (i) vacuuming and soaking alumina fiber in pretreatment solution, performing heat treatment on alumina fiber, and performing pretreatment solution immersion-heat treatment process, (ii) placing surface-coated alumina fiber in vapor deposition furnace, depositing prefabricated coating on surface of coating, and using electro-pulse deposition method to grow nanowires on surface where prefabricated coating is deposited to obtain a nanowire coating on surface of alumina fiber, (iii) ball-milling and uniformly mixing alumina ceramic powder, graphene, carbon nanotubes, solvent, dispersant, binder, pore former and crystal inhibitor to prepare a alumina matrix slurry, (iv) placing alumina fibers with nanowire coating in alumina matrix slurry for pressure impregnation, laminating alumina fibers, vacuuming and pressurizing, and hot pressing, and (v) sintering composite material body. USE - The method is used for preparing high temperature resistant reinforced and toughened oxide/oxide composite material. ADVANTAGE - The composite material has high strength, high toughness and high-temperature resistance. DETAILED DESCRIPTION - Method for preparing high temperature resistant reinforced and toughened oxide/oxide composite material, involves (i) performing pretreatment of alumina fiber by vacuuming and soaking alumina fiber of required size in a pretreatment solution according to actual needs for 2-4 hours, performing heat treatment on the impregnated alumina fiber in a high-temperature furnace at 100-300 degrees C, repeating the pretreatment solution immersion-heat treatment process for the alumina fibers for 1-4 times to obtain alumina fibers with a surface film of 10-500 nm, and performing the pretreatment solution immersion-heat treatment process, (ii) placing the surface-coated alumina fiber in a vapor deposition furnace, depositing a 10-500 nm prefabricated coating on the surface of the coating, where the prefabricated coating is a pyrolytic carbon coating or a boron nitride coating, and using the electro-pulse deposition method to grow nanowires on the surface where the prefabricated coating is deposited to obtain a nanowire coating on the surface of the alumina fiber, (iii) ball-milling and uniformly mixing the alumina ceramic powder, graphene, carbon nanotubes, solvent, dispersant, binder, pore former and crystal inhibitor in a ball mill tank, adding aqueous ammonia to adjust the pH value to 7-9, or adding acidic solution to adjust the pH value to 3-5, and uniformly stirring to prepare a alumina matrix slurry, (iv) placing the alumina fibers with nanowire coating in alumina matrix slurry for pressure impregnation, laminating the alumina fibers in a mold and placing in a vacuum bag, vacuuming and pressurizing, taking out and hot pressing in a hot press at 50-500 degrees C for 2-10 hours to prepare a composite material body, and (v) sintering the composite material body in a high-temperature furnace at 1000-1400 degrees C, and heat-preserving for 2-5 hours to prepare the high temperature resistant reinforced and toughened oxide/oxide composite material.