Copper clad aluminum bus bar, also known as CCA busbar, bimetallic conductive bar, is the third generation of "new energy-saving conductor material" after copper and aluminum. It not only has the excellent electrical conductivity of copper, and has the characteristics of low aluminum density.
| Thickness/mm | Thickness tolerance/mm | Width/mm | Width tolerance/mm |
| ＞3.00～6.00 | ±0.10 | ≤30.00 | ±0.50 |
| ＞6.00～10.00 | ±0.15 | ＞30.00～100.00 | ±0.80 |
| ＞10.00 | ±0.20 | ＞100.00 | ±1.20 |
| Item (Unit) | Copper-clad-aluminum busbar（VPcu=25%） | |
| Hard Y | Soft R | |
| Tensile strength (MN/m2) | ≥170 | ≥115 |
| Elongation(%) | ≥3 | ≥28 |
| Maximum resistivity (Ω·mm2/m) | 0.02548 | 0.02498 |
| Minimum volume conductivity (%IACS) | 67.7 | 69 |
| Density (g/cm3) | 4.25 | 4.25 |
| Linear thermal expansion coefficient (1/°C) | 22.5×1010-6 | 22.5×1010-6 |
| Temperature coefficient of resistance (1/°C) | 3.9×1010-3 | 4.0×1010-3 |
| Coating layer volume ratio/% | Temper | Density (g/cm3) | Interface bonding strength/MPa | Tensile strength/MPa | Elongation/% | maximum DC resistivity (Ω·mm2/m) | volume conductivity not less than (%IACS） |
| 20% | Hard Y | 3.94 | ≥40 | ≥160 | ≥3 | 0.02596 | 66.4 |
| Soft R |
|
≥110 | ≥25 | 0.0255 | 67.6 | ||
| 25% | Soft R | 4.25 | ≥40 | ≥170 | ≥3 | 0.02548 | 67.7 |
| Soft R |
|
≥115 | ≥28 | 0.02498 | 69 | ||
| 30% | Soft R | 4.56 | ≥40 | ≥180 | ≥3 | 0.02477 | 69.6 |
| Soft R |
|
≥120 | ≥30 | 0.02424 | 71.1 |
The AC ampacity of a single product is shown in the table below, and the DC ampacity should be increased appropriately by referring to the table below.
The data in the table below are indoor test data, without considering the influence of outdoor factors such as wind speed.
The data in the table is the AC current carrying capacity when the sample is placed vertically without coating. When the sample is placed flat, and the width is ≤60.00mm, the data in the table should be multiplied by 0.95; when the width is >60.00mm, the data in the table should be multiplied by 0.92.
The product works stably in an environment of 25°C, and the AC ampacity when the temperature rise is 50K, 65K and 75K.
To learn about the current carrying capacity of different specifications, you can download the PDF. If you want to know more about copper-aluminum composite busbar products, please contact Chalco Aluminum, and we will provide you with a good solution.
Good electrical conductivity
Compared with the copper-clad aluminum volume ratio of 15% or 20%, the copper-clad aluminum discharge performance is 85% of the pure copper. The thickness of the copper layer is large and adjustable, suitable for transmitting large currents.
Light weight
The density of copper-clad aluminum bar is only 37%-40% of that of pure copper bar, and the length (volume) of the same weight is 2-2.5 times that of pure copper bar.
Good mechanical properties
It has good tensile strength, bendability and elongation, can be bent, drilled, punched and other properties are the same as pure copper, and has a low density.
Strong bond between copper and aluminum
The atomic intergranular bonding between two different metal materials is achieved at various ambient temperatures, and the copper layer (tin plating, zinc layer) is evenly distributed without any physical defects, and the copper-aluminum interface is a metallurgical bond.
Good scalability and reliability
After a special heat treatment process, it has a certain degree of plasticity, which is conducive to punching, shearing, and bending products without cracking and separation. In order to improve the corrosion resistance, the surface of the copper layer can be tin-plated and galvanized.
Good economic benefits
Save copper, reduce production supporting costs, green and environmental protection, no pollution, copper and aluminum composite busbar. It can be specially used to replace copper and aluminum busbar.
The copper-aluminum composite busbar produced by Chalco is different from traditional production processes such as the traditional hydrostatic extrusion method, rolling crimping method, cladding welding method, casing rolling method, etc. Chalco adopts the original technology of horizontal continuous casting-drawing-high efficiency forming by rolling annealing. This kind of technology can make the copper-aluminum composite busbar bonding interface achieve a certain metallurgical bonding, enhance the shear strength of the two metal interfaces, ensure the mechanical and electrical properties of the product, and improve the stability of the product.
The copper-aluminum composite row produced by Chalco will undergo the following quality inspections to ensure that the product quality is qualified before delivery.
Quality inspection includes: salt spray test; eddy current conductivity test; metallographic microscope; spectral analysis; high and low temperature alternating experiment; brinell hardness statistics; analytical balance; electrical fixture and other tests.
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