How to choose wear-resistant flake graphite?

When flake graphite rubs against metal, a graphite film is formed on the surface of metal and flake graphite. The orientation of the graphite friction surface is better, the crystal film thickness is small, and the adhesion force is large, which can ensure that the wear rate and friction data are small at the end of friction. Its thickness and degree of orientation reach a certain value, that is, the wear is relatively fast at the beginning, and then it drops to a constant value.

Abrasion resistance of flake graphite

Flake graphite has a high thermal conductivity, which helps the self-friction surface to transfer heat quickly, so that the temperature inside the material and its friction surface can be balanced. If the pressure continues to increase, the directional graphite film will be severely damaged, and the wear rate and its friction coefficient will also increase rapidly. If there are graphite metal surfaces with different specifications, in all cases, the higher the allowable pressure, the better the orientation of the graphite film formed on the friction surface.

In the air medium with a temperature of 300~400 degrees, sometimes the friction coefficient increases due to the strong oxidation of flake graphite. It is suitable for working in gaseous or liquid media with 100% humidity, but its use temperature range is limited by the heat resistance of the resin and the melting point of the metal.

Select flake graphite

(1) Effect of flake graphite particle size on expansion factor

The particle size also has a certain influence on the expansion degree of flake graphite, and after experiments, the expansion rate is proportional to the particle size of graphite. Expanded graphite has a rich pore structure, the smaller the mesh structure of expanded graphite, the lower the expansion coefficient, and vice versa. Therefore, in the fields of sealing, fireproof coatings, etc., large-particle size graphite should be selected as a material.

(2) The effect of flake graphite particle size on finish

It can be made into the negative electrode material of the battery, and the size of the flake graphite particle size directly affects the finish of the entire production process. Because the smaller the particle size, the higher the finish of the product we process, and after the particle size becomes smaller, its resistance bending strength will be greatly reduced, resulting in cracks in the electrode and even fracture at high temperatures. Therefore, we will find that large-sized graphite electrodes will not be made of small particles of flake graphite.

The wear-resistant material industry is still an important area of graphite consumption. The application field of flake graphite has obviously shifted to the field of new materials and new energy, which has greatly increased the consumption of new application fields of graphite. Especially with the development of the power industry, in order to ensure the life of metal parts and reduce the amount of loss. It is necessary to use high-quality flake graphite from the Franli factory.