Abstract: Rough surface is the obstacle to the application of diamond thin film. A good polishing method can improve great potential for commercializing. In this paper, we propose a new polishing technology for polishing diamond thin film with magnetic abrasive polishing. Experiment results indicate that it is efficient to remove sharp- angle of crystals without injuring thin films. Magnetic abrasive polishing is a facile method, and can reach a better effect. Diamond coated drawing dies of the copper wire using magnetic abrasive polishing may prolong the working life eight to ten times than traditional cemented carbide dies, can meet the demand of smoothness on the interior hole of drawing dies during copper wire drawing.

Key words: diamond thin films; magnetic abrasive; polishing