The application of composite materials has received increasing attention. Various countries have developed various composite materials to meet the needs of economic development. Among them, copper-clad steel series composite materials are a typical one, and copper materials are very representative as conductive materials. Then, steel is used to supplement the insufficient strength of the copper wire, and the copper-clad steel wire combines the two advantages.
In DC and low-frequency electrical transmission, when high electrical conductivity is not required, ladle steel stranded wires can completely replace pure copper wires, and when used to conduct high-frequency currents, the conductive properties of copper-clad steel wires can be Comparable with pure steel wire of the same outer diameter. This is mainly because the skin effect of the current increases with increasing frequency: the reflection effect of electromagnetic waves on the copper-steel interface redistributes the electromagnetic field in the wire. Because although the electrical conductivity of steel is smaller than that of copper, the former has a much greater permeability than the latter. Because of this, the reflection effect of electromagnetic waves on the copper-steel interface cannot be ignored. This reflection effect makes the electromagnetic distribution in the wire different from the solid wire. Therefore, it is possible that the conductive performance determined by the electromagnetic field distribution is better than the solid copper wire. of. When the transmission frequency exceeds a certain limit, the resistance value of the composite conductor is smaller than that of the copper conductor of the same diameter.