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Physical properties of copper clad aluminum wire
- Jan 30, 2018 -

The performance of metal materials under various physical phenomena becomes physical properties.

The following are some physical properties related to the production and use of copper clad aluminum wires.


Density of 1.


For copper clad aluminum wires with a volume ratio of 15%, the density is 3.63/cm;

10% copper clad aluminum wire with a density of 3.35/cm;

The copper clad aluminum wire has a small density, which has many advantages:


(1) the copper clad aluminum wire is about 1.7 ~ 2.5 times the length of pure copper wire for the same weight and line diameter of pure copper wire and copper clad aluminum wire, which will lower the material cost for the manufacturer.


(2) due to the weight of copper in 1 ton of copper clad aluminum alloy, the weight of copper is 268 ~ 368Kg, which can replace the pure copper wire of 1.7 ~ 2.5 tons, which can save a lot of copper resources by using copper clad aluminum wire.


2. The specific heat


According to the thermodynamics formula Q = cm (t2 - t1), because of the pure copper wire of the specific heat c = 0.092 Kcal/kg. K, copper clad aluminum wire of the specific heat c = 0.149 Kcal/kg. K, this means that the copper clad aluminum wire the specific heat of the heat is much larger than the pure copper wire, so in the same weight of copper clad aluminum wire temperature by one degree requires more heat than pure copper wire.

As mentioned above, in the case of the same weight and diameter, the copper clad aluminum wire is much longer than the pure copper wire, so the heat dissipation condition is better than that of the pure copper wire.

If the copper clad aluminum wire and the pure copper wire resistance are the same, and in the same current condition, after the same time, the wire made of copper clad aluminum wire must be lower than that of the pure copper wire.

This is good for safe electricity.


3. The electrical conductivity


Resistivity of copper clad aluminum wire is bigger than copper, but smaller than aluminum, 20 ℃ when the volume ratio of 10% and 15% of the copper clad aluminum wire dc resistivity Ω acuities were respectively 0.02743 mm/m and Ω 0.02676 mm/m or less.

So will be as stipulated in the international electrotechnical annealing resistivity of copper industry in 20 ℃ is equal to 0.017241 mm/m Ω for standard conductivity, with 100% IACS, said that the conductivity of the copper clad aluminum around 65% IACS.

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4. Tensile strength and elongation.


The tensile strength and elongation are different according to the line diameters, and the specific parameters can refer to the electronic industry standard "SJ/11223-2000 copper clad aluminum wire".


5. Linear expansion coefficient.


The thermal expansion and contraction of metallic materials is well known.

But the volume of different metals varies with temperature.

The linear expansion coefficient of copper clad aluminum wire is similar to that of pure aluminum wire, far greater than pure line.

This feature is very important for the coaxial cable that makes the inner conductor and the shielding layer of aluminum.

When the outside temperature changes, coaxial cable network expansion amount of inner conductor is approximately the same as that of aluminum shield, won't produce like made in pure copper wire conductor, shielding layer shrinkage nearly in winter, summer shield elongation, and make the cable joint to produce the phenomenon of poor contact.