Copper-clad aluminium wire is a new kind of conductor material, which is coated with thin copper layer on aluminium core wire and metallurgical bonds on the interface between copper and aluminium. It not only gives full play to the excellent conductivity of copper and the light quality of aluminium, but also overcomes the shortcomings of aluminium which is easy to oxidize, high contact resistance and difficult to weld joints. It also greatly saves the scarce copper resources in China and reduces the cost of conductors. Therefore, the cable industry in China is gradually expanding its scope of application.
The proportion of copper layer area on the cross section of copper clad aluminium wire is called "copper layer volume ratio". Copper clad aluminium wire can be divided into:
A. The volume of copper layer accounts for 8%-12% and is expressed by 10%.
B. The volume of copper layer accounts for 13%-17% and is expressed by 15%.
Copper clad aluminium wire can be divided into:
A. The hard conductor in working hardening state during drawing is retained.
B. Soft conductors that eliminate work hardening by annealing.
The physical properties and mechanical properties of copper clad aluminium wire are between those of copper wire and aluminium wire. In terms of chemical properties, the surface of copper wire has better oxidation resistance; the surface of aluminium wire is easy to oxidize and form alumina, which enhances the contact resistance of the conductor; the copper layer on the surface of copper-clad aluminium wire www.zhutongjian.cnwww.zhutiejian.net.cnwww.diandongmenz.cnwww.fenshaoluu.cn
www.fusheguan.com.cnwww.zhujianchang.cncuts off the contact between the surface of aluminium wire and air, so it has better oxidation resistance, but the end face of the conductor exposes two metals, copper and aluminium, because the electrode potential of the two metals is very different, it is wet. It is easy to produce electrochemical corrosion in medium, which should be paid attention to when using.