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Aluminuim could not completely replace copper

11 October 2014
Copper can not be completely replaced by aluminium as conductor in different types of cables and wires inspite of higher volume resistivity than copper has. At the same time loss of energy is compensated by lower cost of metal,- said the Development Director of quality alloys factory Sergey Kostin during the 3rd all-Russian conference "Copper, brass, bronze - production and consumption trends" held in St.-Petersburg.

According to his words existing of oxidation film makes difficulty for using of aluminium as base of conductor where there is a need to conduct operations of tin-plating, silver-plating, nickel-plating, iron- plating which are often applied in producing of different cable products.

The way out of current situation is in development of composition "aluminium-copper",- Sergey Kostin noticed. Today there are different technologies to make wire bimetal blank, which is mass-produced and used in twisted pair wire production. From the opposite site the decision is development of bimetal conductor which has aluminium base plated with hot-resistant copper alloy.Pure aluminium has lower volume resistivity and is more plastic in comparison with aluminium alloys. It's more processable at drawing.The ways of cladding are known. It's necessary to develop hot-resistant copper alloy which will provide system availability under determined conditions in cable composition.

At the moment different researching tests of two new alloys are helding, these alloys were designed specially for the purposes. They are from the group of low alloy, i.e. the content of alloying element is less than 5 %, and this fact allows to held tin-plating, silver-plating and other according to proven technologies and using standard equipment. Using copper as a base these alloys can include chrome, zirconium, nickel, niobium, silicon, magnesium which make them hot-resistant.

Source: Ruscable.ru

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