Adaptability of brazing filling metal used for monolayer diamond tools with vacuum furnace brazing

The brazing monolayer diamond grinding wheel has been used in high speed abrasive machining. The present study shows that at appropriate brazing temperature, time and furnace pressure, the commercially available alloy which contains active elements Ti and Cr, such as BNi2,BNi7 alloy and self-developed CuSnNiTi alloy can be used as active filler materials for brazing diamond circular saws. The chemical bonding has been formed among the diamond, brazing alloy and substrate, but there are different bonding strength and performance due to different brazing alloys used. With CuSnNiTi alloy that shows favorable wetting behaviour on diamond surface, the brazing temperature can be reduced and the bonding strength can be enhanced greatly. The grinding test shows that the matrix with this particular filler metal can keep strong retention force to diamond,and the cutting efficiency can be eventually increased under the same cutting life.