Anti-friction effect of ball-milled expanded graphite/Fe powders

A mixture of expanded graphite and iron powders was ball-milled in a high-energy mill under an air atmosphere. The milled powders were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The anti-friction effect of the powders used as lubricating additive was investigated by a tribo-tester. Results show that the powders have an obvious anti-friction effect, and the effect is associated with the crystallization degree of the milled expanded graphite depending on the milling time, the higher the crystallization degree, the higher the anti-friction effect.