Abstract
Copper matrix composites with functionalized carbon nanotubes (CNTs) were synthesized using powder metallurgy with hetero-aggregation mixing and spark plasma sintering. Surface modification of the CNTs was controlled using acid oxidation with different treatment times. After a moderate treatment time of 3.5 hours, the CNTs had enough charged groups to maintain a moderate structural integrity in a CNT/Cu composite material. The prepared composite exhibited a tensile strength of 457 MPa and Vickers hardness of 130 HV, which are 1.6 and 2 times higher, respectively, than those of unreinforced copper prepared by the same method. The electrical conductivity of this composite was 92 pct IACS, which is 94 pct of that of the unreinforced copper. The carbon nanotube/copper (CNT/Cu) composites exhibited a good combination of high strength and high electrical conductivity.
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