Abstract: The mixed powders of copper-plated graphene reinforced TC4 titanium were prepared by ultrasonic agitation and ball grinding. After pressing the composite powders, the graphene titanium-based bulk was produced by the microwave sintering. The influence of graphene content on the microstructure and mechanical properties of titanium matrix composites was studied by X-ray diffraction, scanning electron microscope, energy spectrum analysis, microhardness, room temperature compression, and frictional wear. The results prove that: Ti2Cu and TiC phase are detected in all the composites with different contents. When the content of graphene is 0.5%, the GNPs phase appears, and the higher the GNPs content, the stronger the phase peak. As the content of graphene increases, the relative density, microhardness, compressive strength at room temperature and wear resistance of titanium matrix composites increase first and then decrease. Among them, the performance of the composite is the best when the content of graphene is 0.8%. Compared with the pure Ti6Al4V matrix, the microhardness and compression strength of the titanium matrix composite with 0.8% graphene increase by 80.9% and 69.9% respectively. Compared with the pure Ti6Al4V matrix, the compression strengths of GNPs/Ti6Al4V and GNPs-Cu/Ti6Al4V composites increase by 33.2% and 69.9% respectively. The compressive strength of GNPs-Cu/Ti6Al4V composites prepared by microwave sintering is 41.6% and 22.9% higher than that of vacuum sintering and hot pressing sintering respectively. The wear mechanism of copper-plated graphene reinforced TC4 composite is the coexistence of abrasive and adhesive wear.
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2021, Vol. 35 
