▎ 摘　　要

NOVELTY - Mixed dispersion-enhanced copper-tungsten-chromium electrical contact material comprises 0.1-0.5 wt.% graphene oxide, 0.1-0.5 wt.% cerium oxide, 0.1-0.5 wt.% yttrium oxide, 0.223-0.228 wt.% aluminum, 35 wt.% tungsten, 5 wt.% chromium, the balance is copper and unavoidable impurity elements. USE - Mixed dispersion-enhanced copper-tungsten-chromium electrical contact material. ADVANTAGE - The mixed dispersion-enhanced copper-tungsten-chromium electrical contact material has effectively refined contact material grains, improved strength and hardness, reduced arc ablation, improved anti-welding performance of the contact, and improved overall performance significantly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a mixed dispersion-enhanced copper-tungsten-chrome electrical contact material, which involves: (A) weighing 55.7-57 wt.% copper-aluminum alloy powder, 35 wt.% tungsten powder, 5 wt.% chromium powder, 0.1-0.5 wt.% graphene oxide, 0.1-0.5 wt.% cerium oxide powder, 0.1-0.5 wt.% yttrium oxide powder and 1.5-4 wt.% cuprous oxide powder; (B) pre-mixing opper-aluminum alloy powder, tungsten powder, chromium powder, cerium oxide powder, yttrium oxide powder, and cuprous oxide powder in a mixer for 1.5-4.5h 4.5h; (C) adding the graphene oxide to deionized water and performing ultrasonic dispersion to prepare a graphene oxide suspension for future use; (D) adding premix to the graphene oxide suspension and then putting the mixture in a ball mill tank for ball milling for 4-6h to prepare mixed ingredients; (E) transferring mixed ingredients to a vacuum freeze-dryer for freeze-drying for 20-28 hours: (F) transferring to the mixer again and mixing for 40-80min to obtain RGO/GO/Cu-0.4 wt.% Al/35W5Cr composite powder for future use; (G) transferring RGO/GO/Cu-0.4 wt.% Al/35W5Cr composite powder to a graphite mold, and then placing the graphite mold in a vacuum of 0.04-0.08Pa; (H) controlling the heating rate in the sintering furnace to 8-12 degrees C / min, and uniaxially pressing on the graphite mold while heating up, when the temperature in the furnace rises to 550-650 degrees C; and (I) controlling uniaxial pressure on the graphite mold to 28-32 MPa, releasing the pressure after holding the pressure for 0.8-1.2 h, heating up to 900-1000 degrees C, and then starting the heat preservation, after 0.8-1.2 h cooling with the furnace, when the temperature drops to room temperature, taking out the sample to obtain the finished electrical contact material.