Investigation on the Surface Coating of Grinding Balls

摘要

The surface coating of grin ding balls was investigated experimentally. The results show that a coating may form on the surface of grinding balls when Cr or Al powders are subjected to ball grinding. The plastic deformation of the ball surface plays an important role during the coating formation, and the strong binding force between the powders and the balls is a necessary pre-condition. The thickness of coating increases with the plasticity of the pow- ders and the balls. Annealing the balls with coating will result in an obvious diffusion of the elements in the bonding zone of interface.