Copper Busbar Science

 

Copper busbar is an indispensable conductive material for manufacturing motor windings, high and low-voltage electrical appliances, switch contacts, and wires for power distribution installation.

 

 

 

 

 

 

 

 

 

 

 

Copper busbar is a wide variety of copper processing materials. Copper busbar has high mechanical properties, good electrical

conductivity, thermal conductivity, excellent corrosion resistance, electroplating, brazing, beautiful metallic luster, good forming and processing performance, various power transmissions and transformations, electrical equipment, etc. made of it have been widely used in the power field. In recent years, with the continuous and rapid development of the national economy, the output and consumption of copper busbars in my country have also increased significantly, and the quality requirements for copper busbars have also been continuously improved. Quality influencing factors The surface quality of copper busbar can be divided into three main aspects: surface smoothness, surface flatness, and surface defects. It is inseparable from copper properties, production processes, management, and environment.

 

 

Compared with other metals, copper has good corrosion resistance, but it will still undergo chemical changes in high temperature, humidity, acid mist, and other environments, resulting in surface discoloration. In the production, storage, and transportation of copper busbars, these adverse environmental conditions exist to varying degrees, which will have a certain impact on the surface quality.

 

 

In the atmospheric environment, copper will slowly oxidize at room temperature; when the temperature rises to 100 degrees Celsius, black copper oxide begins to form, and the oxidation rate is proportional to the logarithm of time; when the temperature rises to 185 degrees Celsius, the oxidation rate increases significantly, and when the temperature rises to above 400 degrees Celsius, the oxidation rate is even faster, increasing in a parabolic manner.

 

 

In a humid environment, the presence of water vapor causes the copper busbar surface to corrode or oxidize. When the temperature is constant, the growth rate of the oxide film increases with the increase in humidity.

 

 

The functions of process lubricants are to reduce friction, ensure and improve the surface quality of processed materials, prevent metal from sticking to the mold, and cool down. Lubricants, residual acids, and residual water remaining on the surface of the copper busbar during the copper busbar drawing process will also directly or indirectly affect the surface quality of the copper busbar. A good lubricant has good lubricity, and the residual capacity on the surface of the copper busbar is the root cause of discoloration or corrosion marks on the surface of the copper busbar.

 

 

1. Ensure that the charge is dry, strengthen the melt coverage, and improve the casting process

Ensuring that the charge is dry can prevent the moisture in the charge from reacting with copper to form oxide inclusions and absorb hydrogen; strengthening the melt coverage can prevent the melt from absorbing gas and oxidation, thereby preventing the copper busbar from producing "hydrogen disease" or "oxygen disease" during the heat treatment process, causing surface defects such as peeling, bubbles, inclusions, etc. on the copper busbar surface; a reasonable casting process can not only maximize production efficiency, but also reduce defects such as looseness, cracks, coarse grains, and segregation of tissues, thereby reducing surface cracks, voids, and surface roughness on the copper busbar surface, and improving the surface quality of the copper busbar.

 

2. Strengthen production process control and production management

To reduce surface defects of copper busbars, it is important to strengthen process control and production management.

 

3. Pickling of copper busbar blanks

After the copper ingot is heated and extruded to form a copper busbar blank, there is a lot of copper oxide on the surface of the copper busbar blank due to heating, which can only be removed through the pickling process.

 

4. Optimal selection and rational use of hot extrusion dies and stretching dies

Copper hot extrusion dies work under harsh high-temperature conditions and generally use metal ceramic dies that have both ceramic properties (high hardness, wear resistance, high-temperature resistance, oxidation resistance, and corrosion resistance) and metal properties (high toughness and plasticity).

 

 

 

 

If you are interested in our copper busbar-related products, please click the link below to learn more about it

 

https://www.stamping-welding.com/search/Copper%20BusBar.html