Due to the high chemical stability of diamond blades, it is difficult to have chemical reactions with other metals to complete welding. Therefore, how to reliably achieve the solid connection between diamond blades and metals has become a technical difficulty and urgent research in the diamond tool manufacturing industry. Subject. It is very difficult to directly weld diamond blades by brazing method, and it is also a problem that has attracted much attention from the public.
Complete the brazing requirements of diamond blades to deal with the following problems:
(1) Wetting performance: During brazing, the brazing material must wet the material to be welded to ensure that the blade is free of defects. Due to the high surface energy of diamond and poor wettability, it is found that the surface of diamond and metal matrix has good quality Wetting solder is the key to successful brazing.
(2) Bonding performance: The solder should not only have good wettability, but also have a chemical reaction with the material to be welded to form a chemical bond connection, so as to complete the welding with sufficient adhesion.
(3) Residual stress: The thermal shrinkage coefficient of diamond and metal is nearly ten times different, and a large residual stress will be formed during the cooling process after welding, which will affect the welding strength and even damage the diamond.
(4) Corrosion of diamond: diamond will be oxidized or graphitized at high temperature, and some metals also have a corrosive effect on diamond, so it is necessary to choose a suitable working environment and brazing material to reduce the corrosion of diamond to a minimum level .