METHOD OF PRODUCING AN ALUMINIUM WIRE COVERED WITH A COPPER LAYER, AND WIRE OBTAINED

摘要

To produce an aluminium wire covered with copper, capable of retaining its original electrical and mechanical properties when used in environments in which the temperatures exceed 150°C, the wire is produced by a method during which a material 4 foreign to copper and to aluminium is introduced in a small amount at the interface between the aluminium core 21 and the copper layer 31. The material 4 has the effect of retarding the precipitation of copper in the aluminium and the growth of Guinier-Preston zones. The wire is produced by a known method of reducing the diameter of a composite bar 11 and the foreign material 4 is introduced into the interface between the copper and the aluminium during production of the composite bar so as to be present in trace amounts after reduction of the diameter.