Traditional mechanical process refers to the treatment of the surface, such as grinding, sand blast and so on. When it used in the CVD diamond coated carbide tools, which is the main means of mechanical polishing and ultrasonic cleaning. Mainly using diamond abrasive powder or fine diamond paste on respective base body is polished such that the surface of the substrate or the surface of the large number of mechanical scratches or shallow grooves, resulting in surface defect density is increased and the expansion of diamond nucleation sites. Solid surface defect position contains a large amount of lattice edges and kinks order, with crystal particles have higher binding force, thereby reducing the diamond nucleation free energy and enhanced nucleation effect. In addition, remain on the substrate surface diamond fine powder can be used as a seed diamond nucleation, which is one of main reason that the use of this method can greatly improve the adhesion of diamond nucleation density and the surface of the substrate.
Foreign researchers related use diamond grinding wheel for tungsten carbide matrix grinding, deposits a layer of diamond film in the process of applying the transition layer the above mentioned, through the gap between detection experiments prove diamond film and the cemented carbide substrate having good adhesion. However, after the grinding process, the surface of cemented carbide leaves more scratches, shallow pit, which will make the diamond nucleation density increase by a certain degree of influence. Meanwhile, it not only causes the damage of the surface of tungsten carbide matrix, but also has worse reuse, especially for the electronics and optics products with high demand of precision has a bad influence.
