▎ 摘　　要

NOVELTY - Preparing rare earth oxide-graphene nanosheets/aluminum-based blanks comprises e.g. performing ultrasonic pre-dispersion of graphene nanosheets in nitric acid solution, cooling to room temperature, washing with deionized water until neutral, centrifuging, and drying in a vacuum drying oven, adding the graphene nanosheets pretreated to absolute ethanol solution and performing ultrasonic in a ultrasonic power, adding cerium nitrate to absolute ethanol to dissolve ultrasonically, then adding the solution in dropwise to the graphene in the ethanol solution, and continuing ultrasonic treatment during the addition process, and added amount of cerium nitrate, according to the molar ratio of graphene nanosheets to cerium nitrate. USE - The method is useful for preparing rare earth oxide-graphene nanosheets/aluminum-based blanks. ADVANTAGE - The method: improves the usability of the coating layer on the basis of improving wetting; the grain structure is refined; is simple and suitable for mass production; ensures that the reaction temperature is low and the risk factor is low, while having a good interface, reduces the probability of agglomeration of graphene nanosheets, reduces the formation of the brittle phase Al4C3 at the interface between carbon and aluminum, thus its dispersion is guaranteed, has simplicity, safety, low cost, easy operation and controllability. DETAILED DESCRIPTION - Preparing rare earth oxide-graphene nanosheets/aluminum-based blanks comprises (i) performing ultrasonic pre-dispersion of graphene nanosheets in 99-99.999% nitric acid solution for 6-8 hours in a temperature 60-80 degrees C, cooling to room temperature, washing with deionized water until neutral, centrifuging, and drying in a vacuum drying oven; (ii) adding the graphene nanosheets pretreated in step (i) to absolute ethanol solution and performing ultrasonic for 10-15 minutes in a ultrasonic power of 150 W; (iii) according to the molar ratio of cerium nitrate to absolute ethanol of 1:5 to 1:8, add cerium nitrate to absolute ethanol to dissolve ultrasonically, then adding the solution in dropwise to the graphene obtained in step (ii) in the ethanol solution, and continuing ultrasonic treatment during the addition process, and added amount of cerium nitrate is according to the molar ratio of graphene nanosheets to cerium nitrate 1:0.35-1:0.85, after the addition is complete, continuing the ultrasound for 3-5 hours; (iv) adding urea crystals and glycerol to the suspension of graphene nanosheets in step (iii) and performing ultrasonic for 10-30 minutes, the molar ratio of graphene nanosheets to urea solution is 1:0.7-1:1.6, and volume ratio of total volume to glycerin is 5:1-7:1; (v) introducing the suspension of graphene nanosheets in step (iv) into the hydrothermal reactor, where the volume of the suspension is 25-60% of the solution in the reactor, then placing in the reaction furnace and heating at 1-3 degrees C/second, warming to 80-100 degrees C, keep warming for 1-3 hours, then warming at 3-5?Oc/seconds to 150 degrees C, keep warming for 2-6 hours, introducing a centrifuge tube to centrifuge to obtain a precipitate, and the speed is controlled at 7000-9000 rpm, after repeated washing with absolute ethanol, drying under vacuum oven to obtain prefabricated materials; (vi) placing the powder obtained in step (v) into a corundum crucible and placing in a vacuum tube furnace at 500-600 degrees C for 2-3 hours to obtain graphene nanosheets coated with cerium oxide; (vii) placing the obtained cerium oxide-coated graphene nanosheets and aluminum alloy powder into ethanol and stirring to assist ultrasonic pre-mixing, the quality of aluminum powder depends on the content of graphene nanosheets, the quality control of graphene nanosheets is the total mixed powder 0.1-3 wt.%, the volume ratio of ethanol to mixed powder is 1.5:1-1:1, the time is controlled to 30 minutes, and then vacuum drying the resulting powder; (viii) introducing the graphene nanosheets coated with cerium oxide and deionized water into a vertical ball mill tank for ball milling, the ball-to-material ratio is 6:1-10:1, and the quality of deionized water is controlled as 1/3-1/2 of the material, the time is controlled at 5-12 hours, intermittently polishing the ball mill is stopped in every 2 hours for 10-20 min, the rotation speed is controlled at 260-500 rpm, the whole process is protected by argon gas; (ix) further drying the mixed powder in a vacuum furnace and placed in a graphite mold for semi-solid sintering, where the thickness of the graphite mold base plate is controlled at 10 mm, and the outer side of the inner core has a slope of 1-2 degrees , the angle of the graphite bottom plate corresponds to it, the gap between the graphite bottom plate and the inner liner is less than or equal to 0.08 mm, the preparation process is protected by argon gas, the heating rate is controlled 5-8 degrees C/minute to 10-20 degrees C to below the solid phase line, and then continue heating at 1-3 degrees C/minute and control its liquid phase ratio in 15-25% under pressure of 30-100 MPa, sintering time is 2-3 hours; (x) subjecting the composition material obtained in step (ix) to equal-angle angular extrusion, the extrusion angle is 110-130 degrees , the number of times is 3-7 times, the temperature is controlled to 300-350 degrees C, and the extrusion method is continuous extrusion, after a single extrusion, rotating at 90 degrees for the next treatment.