▎ 摘　　要

NOVELTY - Graphene-reinforced alumina-based ceramic bearing comprises ceramic core material including 90-95 wt.% alumina ceramic powder, 4.5-8 wt.% silica powder, 0.5-2 wt.% graphene powder and 15-24 wt.% plasticizer. USE - The graphene-reinforced alumina-based ceramic bearing is useful for robot (claimed). ADVANTAGE - The ceramic bearing: introduces graphene material with excellent mechanical property and thermal property into the alumina-based ceramic core material system. The method is simple, easy to operate; and has strong operability. The prepared ceramic core: has excellent high temperature performance and is easy to dissolve, which can meet the preparation and use requirements of single-crystal hollow blades; and can ensure the dimensional accuracy and qualification rate of the blades. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing graphene-reinforced alumina-based ceramic bearing comprising, (i) uniformly mixing alumina ceramic powder, silica powder and graphene powder by using a three-dimensional mixer to form ceramic powder with uniform composition, (ii) adding 15-24 wt.% plasticizer, first melting the plasticizer, then gradually adding the ceramic powder into the plasticizer, adding all the ceramic powder, and continuously stirring for 10-20 hours to obtain ceramic core slurry, (iii) preparing ceramic core by using hot pressing injection molding method, loading the ceramic core slurry obtained in step (ii) into a pressure injection equipment, and obtaining the desired wet ceramic core in the mold, where the injection pressure is 2-4 MPa, and maintaining the pressure for 10-30 seconds, (iv) sintering the wet ceramic core obtained in step (iii) under the protection of inert atmosphere, where the sintering process mechanism is (a) heating at 400-500 degrees C at a heating rate of 1-2 degrees C/minute to perform the wax removal process, (b) then heating at 1000-1200 degrees C at a heating rate of 2-3 degrees C/minute, and carrying out heat preservation for 2-6 hours to complete low temperature pre-sintering, (c) then heating at 1400-1600 degrees C at a heating rate not greater than 3-5 degrees C/minute for high temperature sintering treatment and carrying out heat preservation for 3-8 hours, and (d) after completing the final sintering, cooling the furnace to obtain graphene-reinforced alumina-based ceramic core.