Preparation and properties of copper matrix composites reinforced with Al2O3 particle fiber blend
To develop copper-based composite materials with high strength,high wear resistance,and high electrical conductivity,plasma discharge sintering(SPS)was employed in this study to prepare copper-based composite materials reinforced with mixed Al2O3 particles(0～4%)and Al2O3 fibers(0～4%).The influence of Al2O3 particle/fiber content on the microstructure,me-chanical properties,and physical properties of the composite materials was investigated.It is found that the microstructure of the Al2O3 particle/fiber reinforced copper-based composite mate-rial is fine,uniform,and highly dense,exceeding 95%density.With increasing Al2O3 particle/fi-ber content,the tensile strength and hardness of the composite material gradually increase,while electrical conductivity and wear resistance decrease slowly.When the Al2O3 particles are at 2%and Al2O3 fibers are at 4wt.%,the material exhibits excellent tensile strength(257 MPa)and wear resistance(friction coefficient 0.142,wear rate 2.57×10-5 mm3/(N·m)),with a tensile strength about 23%higher than that of pure copper,and its wear resistance is 5.5 times higher than that of pure copper,while maintaining a very high electrical conductivity(64.00%IACS).In-depth analysis reveals that its fracture mechanism involves tough pits formed by Al2O3 parti-cles and the pull-out and fracture of Al2O3 fibers,while the wear mechanism is fatigue wear.
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