The raw materials used for manufacturing carbon brushes are divided into three categories: metal powder; The second is carbon and graphite powder; The third is adhesive. Due to different operating conditions of motors, there are various types of carbon brushes and electric brushes. There are significant differences in the technical performance of carbon brushes and electric brushes of different grades. So adjustments need to be made in the formula and process. The formula composition includes:
There are many raw materials used in the manufacturing of electric brushes, which have different material structures and properties. By mixing these materials with different properties in a certain proportion, a comprehensive effect with completely different properties from a single raw material can be obtained. The particle size composition of dry powder affects its packing density, and due to the differences in the overlapping between particles, different degrees of pores (air holes) are generated. The finer the particles, the larger the surface area, and more adhesive is required. The aspect ratio of particles varies, and after forming, carbon brushes and electric brushes exhibit anisotropy. The composition of coal tar pitch and coal tar binder is very complex, and its production method, technical indicators, and amount of addition directly affect the performance of the product. So far, it is not possible to design product formulas using theoretical calculation methods based on the performance requirements of carbon brushes and electric brushes. Generally, it is determined based on a combination of theoretical calculations and practical experiments. When the production process and raw material quality change, the original formula may not be applicable. At this time, the process and formula should be modified to meet the original quality standards and usage requirements. For carbon brushes and electric brush products with high reputation, it is advisable to maintain the stability of the formula and process as much as possible.
