▎ 摘　　要

NOVELTY - Preparing tungsten carbide-cobalt alloy of hard graphene oxide/nano-aluminum oxide composite particles comprises adding the nano-aluminum oxide (20-100 nm) into alumina colloid solution, adding into the oxidized graphene suspension for ultrasonic mixing for 1-3 hours, quickly freezing, adding to the tungsten carbide-cobalt powder after vacuum freezing dry obtain the composite particle of the oxidized graphene/nano-aluminum oxide, where the final mixed powder is 6-11 wt.% cobalt, 0.05-0.2 wt.% oxidized graphene and cobalt powder (balance amount) with particle size less than 5 microns. The mixed powder is weighed according to the weight percentage. The ball milling time is 10-24 hours, the rotating speed of the ball mill is 30-1400 revolutions/minute, and ball material ratio is 5:1-20:1. The cold pressing the mixed powder and sintering to prepare cobalt-copper alloy hard at 1300-1450degrees Celsius, the sinter pressure is 0-60 MPa, and the sintering time is 5-120 minutes. USE - The alloy is useful for wear-resistant parts and structural components, plunger of high-pressure container, hydraulic cylinder, precision roller, synthetic diamond anvil, roller of steel wire rolling mill, mechanical, metallurgy, cutting tool, precision instrument, and military industry. ADVANTAGE - The alloy hard graphene oxide/nano-alumina composite particle has excellent hardness, hardness strength and toughness, and is convenient for industrial application and production in large scale. The protective atmosphere in the dry ball milling and the organic matter liquid in the wet ball-milling can prevent the oxidation and adverse reaction of the raw material powder particles in the ball-milling process.