用表面活化技术提高金刚石与镀层的结合性能

分别用活化处理和未活化处理的金刚石磨粒制备了电镀金刚石工具,通过扫描电子显微镜观察金刚石与镀层的结合状况。对氧化铝陶瓷材料进行钻削加工,对比电镀金刚石钻头在耐用度期间的陶瓷材料去除体积。结果表明,经活化处理的金刚石表面沉积分散的钯质点,工具电镀过程中,在金刚石与镀层间的结合面上形成分散的连接点。应用表面活化技术制作电镀金刚石工具,可使金刚石与镀层形成牢固连接,改善镀层与金刚石的结合性能,其氧化铝陶瓷材料去除体积是未经活化处理金刚石电镀钻头的1.5倍,明显提高了电镀金刚石工具的磨削性能和使用寿命。

Enhancing Bonding Strength Between Diamond Grits and Plating Layer with Surface Activation Technique

Electroplated diamond tools were made of two kinds of diamond grits, activated and un-activated abrasives. The bonding conditions between grits and plating layers were observed with scanning electron microscope. Alumina ceramic was drilled to compare the material removal volume during tool durability periods. The results show that scattered palladium spots are deposited on activated diamond grit surface. Scattered joints, binding diamond grit and layer, are formed during tool electroplating processes. The material removal volume of alumina, drilled with the electroplated diamond tools with activated abrasives, is one and a half times as large as that drilled with normal electroplating diamond tools. The electroplated diamond tools with activated abrasives present better grinding ability than normal electroplated diamond tools. As for electroplated diamond tool applied with surface activation technique, binding strength between layer and grits can be enhanced, and tool life can be prolonged.