Copper powder is low in price and widely used. Recently, many customers have inquired about spherical copper powder, so how to choose copper powder? What kind of copper powder is suitable to choose? The key is to look at the required performance and application. Commonly used copper powders can be roughly divided into spherical and quasi-spherical copper powders, dendritic copper powders, flake copper powders, nano copper wires and other copper powders with special morphologies.
The copper powder obtained by most methods of preparing spherical copper powder is generally spherical copper powder/quasi-spherical (we define the powder with a certain range of distance from the periphery to the center of the powder as spherical/quasi-spherical powder), spherical/quasi-spherical Copper powder has low porosity and relative sliding friction factor, good expandability and ductility, and good miscibility when mixed with other materials.
Dendritic copper powder refers to copper powder with dendritic morphology. It has a more complex geometric structure and relatively large surface roughness, so it has a larger specific surface area, and the number of contact points where copper powder particles meet each other is obvious Therefore, the use of the smallest amount of filler material can maximize the conductivity of the paste.
Copper powder with flake shape is called flake copper powder. When copper powder is used as a conductive coating, the flake copper powder in surface contact is more beneficial to the conduction of electric charges, and the smooth surface can increase the contact area, thereby improving the conductivity.
Copper nanowires refer to nano-copper materials with a length-to-diameter ratio of more than 1,000. Copper nanowires have a large length-to-diameter ratio and exhibit high catalytic activity. They have broad application prospects in petrochemical, fuel cell and other fields. For example, making copper nanowires into thin films as touch screens can reduce the cost of smart products.
In the process of application, copper powders of different morphologies are usually mixed and matched, such as spherical, dendritic and flake, to use their respective advantages to achieve better performance effects.
For more questions about the selection and application of spherical copper powder, please contact yosoar. This article is edited by Cindy.