When the flake graphite rubs against the metal, a graphite film is formed on the surface of the metal and the flake graphite, and its thickness and degree of 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 until the end of the friction. The following Furuite graphite editor analyzes the wear resistance factors of flake graphite:
Flake 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 a temperature of 300~400 degrees, sometimes the friction coefficient increases due to the strong oxidation of flake graphite.
Practice has shown that flake graphite is particularly useful in neutral or reducing media with a temperature of 300-1000 degrees. The graphite wear-resistant material impregnated with metal or resin is suitable for working in a gas medium or a liquid medium with a humidity of 100%, but its use temperature range is restricted by the heat resistance of the resin and the melting point of the metal.
Post time: Jul-25-2022