Copper clad aluminum wire, also called CCA wire. It not […]
Copper clad aluminum wire, also called CCA wire. It not only takes advantage of the excellent electrical conductivity of copper and the light weight of aluminum, but also overcomes the disadvantages of aluminum's easy oxidation, large contact resistance, and difficult joints to weld, and greatly saves scarce copper resources and reduces the cost of conductors. Therefore, in the cable industry is gradually expanding its scope of application.
The ratio of the area of the copper layer on the cross section of the copper clad aluminum wire is called the "volume ratio of the copper layer". Copper-clad aluminum wire can be divided into copper layer volume ratio: 10% for copper layer volume accounted for 8% to 12%; copper layer volume for 13% to 17% represents 15%.
Copper-clad aluminum wires can be divided into hard conductors that retain the work-hardened state during drawing; soft conductors that eliminate the work-hardening phenomenon through annealing.
The physical and mechanical properties of copper clad aluminum wire are between copper wire and aluminum wire. In terms of chemical properties, the surface of copper wire has better oxidation resistance; the surface of aluminum wire is easily oxidized to form alumina, which increases the contact resistance of the wire;
The copper layer on the surface of the copper clad aluminum wire cuts off the contact between the surface of the aluminum wire and the air, so the oxidation resistance is better. However, the end surface of the wire exposes two metals, copper and aluminum. Because the electrode potential of the two is very different, it is wet It is easy to produce electrochemical corrosion in the medium, which should be paid attention to when using.