According to the production method of electric brush, it is divided into two categories. One type is colored electric brush, namely metal graphite electric brush. One type is black electric brush. Colored electric brushes contain nonferrous metals, mainly copper powder, silver powder, lead powder, tin powder, lead oxide powder, etc., and the balance is flake graphite powder.
The content of various metal powders depends on the technical requirements of the electric brush. When the metal content is above !”#, the binder can be mixed and the powder is mixed and pressed directly into the shape. Otherwise, the binder (coal tar, coal tar or resin, etc.) should be added. The black electric brush uses petroleum coke, pitch Coke, carbon black, charcoal, and natural graphite powder, etc., are made by adding some binders (such as coal tar pitch, coal tar and artificial resin, etc.).
The brush made by curing the resin binder is a high-resistance brush, and the products after baking are called carbon brushes and graphite brushes (using natural graphite as the main raw material), and the products after graphitization are called electrochemical graphite brushes.