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The product has good corrosion resistance, high heat transfer efficiency, smooth surface, not easy to scale, low density and high strength.
Thermal conductivity industry (widely used in heat exchangers, etc.); anti-corrosion industry (corrosion-resistant containers, plate heat exchangers, desalination equipment, ships, etc.); decoration industry.
The purity of copper and aluminum, volume ratio of copper layer and interfacial bonding strength are the most key parameters, which determine its conductivity, mechanical properties, processing properties and service properties.
In order to meet the requirements of electric conductivity in the conductive industry, the copper materials used shall meet the material requirements of T2 copper in GB/T5231, and the aluminum material shall meet the material requirements of 1060/8030 aluminum in GB/T3190.In order to ensure the electric conductivity of copper clad aluminum composite materials, it is necessary to ensure that the copper cladding and the aluminum substrate meet the requirements of standards firstly.
The computerizedfinite element analysis shows that the best cost performance is achieved when the volume ratio of copper cladding of the copper clad aluminum composite materials is 20%. At this time, the current carrying capacity is up to 89% of T2 copper bars.The electric conductivity of materials can be changed by adjusting the volume ratio of copper cladding properly, to meet the different requirements of industrial applications. In general, the volume ratio of copper claddingshall not be less than 15% or more than 30%. The higher the volume ratio of copper cladding, the better the electric conductivity is.
The interfacial bonding strength is one of the basic properties for composite materials. The bonding strength of copper and aluminum is directly related to the application and safety of materials.Whether the material will be delaminated during the bending, punching and shearing, and whether the stress produced by thermal expansion and contraction will destroy the bonding layer in the area with large temperature difference are directly related to the interfacial bonding strength.The test and application demonstrate that the interfacial bonding strength (shear strength) is more than 35MPa, which can meet above application requirements.
The overall test of material parameters is carried out for the copper clad aluminum composite bars of Luoyang Copper One Metal Materials Development Co., Ltd by the authoritative testing organizations, such as National Analysis and Testing Center of Nonferrous Metals and Electronic Materials, National Quality Supervision and Inspection Center of Electronic Control and Distribution Equipment, andQuality Inspection and Testing Center ofPower Line Equipment in Power Industry, which meet the requirements of standards.
Reliability test (thermal cycle test and high temperature and high humidity test)
In order to verify the reliability of the composite bars of Luoyang Copper One Metal Materials Development Co., Ltd, especially the reliability of material application under extreme conditions, our company entrustsCQC Intime Testing Technology Co., Ltd. (Suzhou) to carry out the thermal cycle test(1,000 cold and thermal shock tests at temperature-50℃-130℃) and thehigh temperature and high humidity test (1000 hours continuously under temperature 85℃ and humidity 85%) for composite bars of Luoyang Copper One Metal Materials Development Co., Ltd. respectively. All performance indicators of materialsare not reduced and the applicability is excellent before and after the test, which fully demonstrates the reliability of composite bars.
TY-T2/1060/T2-20%-a*b; TY- trademark of Luoyang Copper One Metal Materials Development Co., Ltd; T2/1060/T2-Product brand (T2 for copper cladding, and 1060 for aluminum substrate); 20%-Volume ratio of copper; a*b- Unit ( mm), a is the thickness, and b is the width.
Volume ratio of copper:20%
Weight ratio of copper:45%
Peeling strength of copper and aluminum:≥12
Interfacial bonding strength:≥40
Linear expansion coefficient:20.6
Linear expansion coefficient:28.3
Specific heat capacity:683.6
The copper clad aluminum composite bars of Luoyang Copper One Metal Materials Development Co., Ltd are excellent machinability, and can meet the requirements of shearing, saw cutting, bending and punching.
In particular, the copper clad aluminum composite bars have excellent bending performance during the bending process, and the product can be processed with smaller inner bending diameter (thickness of composite bars + 2mm). It is of great significance in optimizing the design and reducing the cost.
The thickness of the transition layer between copper and aluminum at the interfacial boding of copper clad aluminum composite bars for Luoyang Copper One Metal Materials Development Co., Ltd is 1 - 2μm, which not only realizes the metallurgical bonding between copper and aluminum, but also effectively solves the problems of low bonding strength between copper and aluminum and low resistivity of the transition layer for other composite bars. The interfacial bonding strength of copper clad aluminum composite bars for Luoyang Copper One Metal Materials Development Co., Ltd is more than 40MPa, and they can withstand the stress produced by frequently sudden cooling and heating shock for a long time without reducing the bonding strength of materials.
High electric conductivity
When the volume ratio of copper is 20% for the copper clad aluminum composite bars for Luoyang Copper One Metal Materials Development Co., Ltd, its resistivity is less than0.0245Ω?mm?/m[ 1] , the current carrying capacity can be up to 89% of copper bars, and its temperature rise and short-term resistance can meet the requirements of low-voltage switchgears.It is not necessary to carry out the redesign and it is easy to replace when the structure of electric control and distribution equipment is not changed.
High cost performance
The density of copper clad aluminum composite bars for Luoyang Copper One Metal Materials Development Co., Ltd is 3.94g/cm3,[ 2] and its electric conductivity is 71% of the T2 copper. When they are applied under the same conditions, its weight is less than half that of pure copper. Therefore, it has a significant application cost advantage.
Excellent social benefits
The application of copper clad aluminum composite bars can alleviate the shortage of copper resources in China, conforms to the policy ofsaving copper by aluminum in the field of electric power vigorously promoted in China, and provides excellent social benefits.