金刚石工具真空钎焊钎料的适应性

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

关键词:  工具  单层钎焊  金刚石

Key words:  tools  monolayer brazing  diamond

摘要:

应用真空钎焊技术,分别采用含有强碳化物形成元素Cr、Ti的BNi2、BNi7及自制的CuSnNiTi钎料试制了单层金刚石圆锯片,在一定的钎焊温度、时间及真空度下,金刚石与钎料及基体之间均可形成化学冶金结合,但结合的状况及锯切性能随钎料的不同而改变。试验证实自制的CuSnNiTi钎料钎焊温度低,焊接时金刚石的热损伤小,钎料与金刚石有很好的润湿性。不仅基体对金刚石有较高的把持力而且钎料与所切割的石材有很好的适应性。

Abstract:

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.