▎ 摘　　要

NOVELTY - A graphene doped chrome reinforced copper-based composite material is prepared by preparing chromium doped graphene core-shell structure by chemical synthesis method and chromium doped graphene core-shell structure powder, mixing chromium powder doped graphene core-shell structure powder and 50-90 %mass copper powder, cold-pressing and performing arc melting under the protection of inert gas. The chromium powder is added in an amount of 10-50 %mass. The graphene oxide is added in an amount of 0.001-0.005 %mass based on mass of chromium powder. USE - Graphene doped chrome reinforced copper-based composite material. ADVANTAGE - The graphene doped chrome reinforced copper-based composite material is prepared through rapid solidification process, which refines the size of chromium and achieves controllable preparation of secondary phase chromium with copper alloys having high-strength, high-conductivity and prolonged dispersion-strengthened copper alloy. The secondary phase chromium grains are refined to more than 50%, and has excellent comprehensive properties such as resistance to arc erosion. The composite material has increased hardness of more than 10%, and electrical conductivity of 10-30%. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (i) preparation of graphene doped chrome reinforced copper-based composite material, which involves (A) hydrolyzing 0.2-1 vol.% KH-550 (RTM: gamma -aminopropyltriethoxysilane) for 4-10 hours, adding graphene oxide, stirring for 30-60 minutes to obtain silane coupling agent graphene oxide solution, (B) washing chromium powder with absolute ethanol, ultrasonically washing with deionized water, centrifuging, using upper layer of chromium powder having small particle size and uniform distribution through 1000 mesh sieve, pouring the sieved chromium powder into the pickling solution for pickling, washing with deionized, pouring the chromium powder into the silane coupling agent solution, reacting at 40-100 degrees C for 30-60 minutes, vacuum filtering, drying the powder at 50-100 degrees C to obtain chromium powder doped graphite oxide core-shell structure powder, placing the powder into the hydrazine hydrate solution, maintaining at 85-100 degrees C, magnetically stirring for 10-15 hours, centrifuging to collect the product, washing with water and methanol 3 times, freeze-drying for 24-48 hours, reducing the graphene oxide in the chromium doped graphene oxide core-shell structure to obtain chromium doped graphene core-shell structure powder; and (ii) refining of secondary phase chromium in chrome-copper refractory alloy, which involves mixing chromium doped graphene and copper powder, ball milling, cold pressing copper and chromium doped graphene mixed powder and performing non-consumable arc smelting on the compacted powder block by plastic processing to form a chromium-refined copper-chromium alloy electrical contact composite material.