1. The purity of copper and aluminum, the volume ratio of copper layer and the interface bonding strength are the key parameters, which determine its conductivity, mechanical properties, processing properties and use properties.
2. In the conductive industry, in order to meet the needs of conductivity, the applied copper material shall meet the T2 copper material requirements in GB / t5231, aluminum material
It shall meet the material requirements of 1060 / 8030 aluminum in GB / t3190. In order to ensure the conductivity of copper aluminum composite materials, first of all, it is necessary to ensure that the materials of copper composite layer and aluminum base meet the requirements of the standard.
3. The volume ratio of copper to aluminum composite is 20%, and its cost performance is the best. The current carrying capacity is 89% of T2 copper bar. In order to meet the different requirements of industry application, the conductivity of the material can be changed by adjusting the volume ratio of copper cladding properly. Generally speaking, the volume ratio of copper cladding shall not be less than 15% and not more than 30%. The higher the volume ratio of copper cladding, the better the conductivity.
4. As one of the basic properties of composite materials, the bond strength of copper and aluminum is directly related to the application and safety of materials. Whether the materials are layered during bending, punching and shearing, and whether the stress produced by thermal expansion and contraction in the area with large temperature difference will damage the bonding layer are directly related to the bonding strength of the interface. The test and application show that the interface bonding (shear) strength is greater than 35 MPa, which can meet the above application requirements.
Machinability
The Bi metallic transition plate produced by Henan Chalco has good machining performance and can meet the requirements of cutting, sawing, bending and punching.
Especially in the bending process, the Bi metallic transition plate has excellent bending performance. The smaller inner bending diameter (composite row thickness + 2mm) can be used to process products, which is of great significance in optimizing design and reducing cost.
Characteristics of Bi metallic transition plate products of Henan Chalco
1. High reliability
The thickness of the transition layer between copper and aluminum at the interface of the Bi metallic transition plate in Henan Province is 1 ~ 2 μ m, which not only realizes the metallurgical combination between copper and aluminum, but also effectively solves the problems of low bonding strength and low resistivity of the transition layer between other composite platoons. The interface bonding strength of copper copper aluminum composite row is more than 40MPa, which can withstand the stress produced by long-term, high-frequency sudden cooling and thermal shock without reducing the bonding strength of the material.
2. High conductivity
When the volume ratio of copper to aluminum is 20%, the resistivity of the Bi metallic transition plate in Henan Province is less than 0.0245 Ω? M m? / m, and the current carrying capacity can reach 89%. The temperature rise and short endurance of the copper aluminum composite platoon can meet the requirements of low-voltage switchgear. Without changing the structure of electric control and distribution equipment, there is no need to redesign, and it is convenient to change.
3. High cost performance
The density of the Bi metallic transition plate of Henan Chalco is 3.94g/cm? And the conductivity is 71% of T2 copper. When applied under the same conditions, the weight is less than half of pure copper, which has significant application cost advantage.
4. Good social benefits
The application of Bi metallic transition plate can alleviate the shortage of copper resources in China, which is in line with the policy of "saving copper by aluminum" in the power field vigorously promoted by the state, and has good social benefits.
