Abstract: Cu-Sn/TiH2 alloy powders were prepared by using mechanical ball milling method , the prepared powders have the characteristics of small particle size and uniform distribution of elements .The vacuum brazing experiment of Cu-Sn/TiH2 alloy powders and diamonds was further carried out .The experimental results indicate that the diamonds surface formed a continuous and dense TiC layer when the brazing temperature is 920 ℃ and the brazing time is 12 min, and the formed TiC layer can help achieve high bonding strength between brazing alloy and diamonds .The relative density of the brazing layer reach 97 .6;, there is only a little tiny spherical pores .The thermal damage of brazed diamonds is very small , the diamonds mainly occurr micro-fracture, fracture and rubdown in cutting process , and there is few diamonds pull-out during the cutting processing .

Key words: Cu-Sn/TiH2 alloy powders were prepared by using mechanical ball milling method , the prepared powders have the characteristics of small particle size and uniform distribution of elements .The vacuum brazing experiment of Cu-Sn/TiH2 alloy powders and diamonds was further carried out .The experimental results indicate that the diamonds surface formed a continuous and dense TiC layer when the brazing temperature is 920 ℃ and the brazing time is 12 min, and the formed TiC layer can help achieve high bonding strength between brazing alloy and diamonds .The relative density of the brazing layer reach 97 .6;, there is only a little tiny spherical pores .The thermal damage of brazed diamonds is very small , the diamonds mainly occurr micro-fracture, fracture and rubdown in cutting process , and there is few diamonds pull-out during the cutting processing .