▎ 摘　　要

NOVELTY - Preparation of semi-solid billet coated with cerium oxide graphene oxide aluminum material, involves adding graphene oxide to an absolute ethanol solution and ultrasonically processing, adding cerium nitrate to absolute ethanol and ultrasonically processing, adding urea crystals to absolute ethanol and adding to obtained suspension of graphene oxide and cerium nitrate and ultrasonically processing, dripping aqueous ammonia, sealing the obtained solution in a sealed tank, placing the obtained prefabricated material into a corundum crucible and calcining, adding cerium oxide-coated graphene oxide and an aluminum alloy powder in ethanol and stirring, adding obtained cerium oxide-coated graphene oxide and aluminum alloy powder mixture into a pure aluminum flat bag to seal, carrying out cold extrusion treatment, placing the obtained composite material into a graphite crucible for heating, and casting the obtained semi-solid composite material. USE - Preparation of semi-solid billet coated with cerium oxide graphene oxide aluminum material. ADVANTAGE - The method enables preparation of semi-solid billet with improved binding property of cerium oxide graphene oxide aluminum material and reduced formation of brittle phase at the interface between carbon and aluminum and graphene floating defects due to density differences. DETAILED DESCRIPTION - Preparation of semi-solid billet coated with cerium oxide graphene oxide aluminum material, involves (i) adding graphene oxide to an absolute ethanol solution and ultrasonically processing for 10-15 minutes at an ultrasonic power of 150 W or more to obtain an ethanol suspension of graphene oxide, (ii) adding cerium nitrate to absolute ethanol at a molar ratio of 1:5-1:8 and ultrasonically processing, adding the obtained solution to the ethanol suspension of graphene oxide and ultrasonically processing for 3-5 hours, (iii) adding urea crystals to absolute ethanol and adding to the obtained suspension of graphene oxide and cerium nitrate and ultrasonically processing for 10-30 minutes and stirring of 200-300 rpm, (iv) dripping aqueous ammonia to the obtained suspension of graphene oxide and cerium nitrate and stirring, controlling the pH value to 8-9 and reacting for 7-12 hours, (v) sealing the obtained solution in a sealed tank, heating at 150-200 degrees C for 2-3 hours, cooling in air at room temperature, using a centrifugal device to obtain a precipitate, repeatedly washing with anhydrous ethanol and vacuum oven drying to obtain prefabricated material, (vi) placing the prefabricated material into a corundum crucible, tightly covering the corundum crucible and placing into a vacuum tube furnace to heat to 400 degrees C, heating to 450-600 degrees C and calcining at a high temperature for 1-3 hours to obtain cerium oxide-coated graphene oxide, (vii) adding 7-12 wt.% cerium oxide-coated graphene oxide and an aluminum alloy powder in ethanol in a volume ratio of 1.5:1-1:1 and stirring for 30 minutes and vacuum drying, (viii) adding obtained cerium oxide-coated graphene oxide and aluminum alloy powder mixture into a pure aluminum flat bag to seal, carrying out cold extrusion treatment at an extrusion pressure of 10-18 MPa and a holding pressure for 5-10 minutes, and performing hot extrusion treatment at 400-450 degrees C, (ix) selecting aluminum foam rods of the same length and placing them in a graphite crucible and vibrating, (x) placing the obtained composite material into a graphite crucible for heating, and (xi) casting the obtained semi-solid composite material in a mold preheated to 500 degrees C, connecting an ultrasonic probe to the bottom of the mold and ultrasonically processing at 500-1200 W.