When flake graphite rubs against metal, a thin graphite film is formed on the surface of metal and flake graphite, and its thickness and orientation reach a certain value, that is, the flake graphite wears quickly at the beginning, and then drops to a constant value. The clean metal graphite friction surface has better orientation, smaller crystal film thickness and larger adhesion. This friction surface can ensure that the wear rate and friction data are small at the end of friction. The following editor of Furuite Graphite takes you to analyze the wear resistance factors of flake graphite:
Graphite has high thermal conductivity, which helps to transfer heat quickly from the friction surface, so that the temperature inside the material and its friction surface can be balanced. If the pressure continues to increase, the oriented graphite film will be severely damaged, and the wear rate and friction coefficient will also increase rapidly. For different graphite metal friction surfaces, 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 the temperature of 300~400℃, sometimes the friction coefficient is increased due to the strong oxidation of flake graphite.
Practice shows that flake graphite is especially useful in neutral or reducing media with temperature of 300~1000℃. Graphite wear-resistant material impregnated with metal or resin is suitable for working in gas or liquid medium with humidity of 100%, but its application temperature range is restricted by the heat resistance of resin and the melting point of metal.
Post time: Dec-28-2022