凝胶结合剂超细金刚石磨粒工具的制备及应用  

Fabrication and Application of Gel-bonded Ultrafine Diamond Abrasive Tools

作　　者：陆静[1] 罗求发 宋运运[1] 胡光球[1] 徐西鹏[1] 

机构地区：[1]华侨大学脆性材料加工技术教育部工程研究中心,厦门361021

出　　处：《机械工程学报》2015年第15期205-212,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金-广东联合基金重点(U1034006);国家自然科学基金青年基金(51105149);高校博士学科点专项科研基金(20133501130001)资助项目

摘　　要：利用溶胶凝胶原理制备超细粒度金刚石磨料工具。提出对超细金刚石磨料进行剪切分散解决磨料在凝胶结合剂中的分散问题;选用复合干燥控制化学添加剂改善凝胶结合剂基体的性能;加入偶联剂提高凝胶结合剂基体对超细金刚石磨粒的把持能力。研究结果表明,经剪切分散后的超细金刚石磨料在凝胶结合剂中分布均匀;复合添加剂成功抑制了凝胶结合剂基体的收缩并防止了其脱水失效;偶联剂通过化学键合的作用有效提高了凝胶结合剂基体对超细金刚石磨粒的把持能力,减少了磨粒的脱落。采用所制备的超细金刚石凝胶结合剂工具磨抛加工两种典型的硬脆性基片材料,获得了纳米级甚至亚纳米级的超光滑无损表面。Ultrafine diamond abrasive tools have been made by sol-gel technique. Shear dispersing is proposed to resolve the uneven distribution of abrasives in the gel bond. Multiple drying control chemical additives are used to improve the property of the bond matrix. And coupling agent is added to enhance the pullout strength of the abrasives from the bond. The results show that ultrafine diamond abrasives distributed uniformly in the gel bond after the shear dispersion. The modified matrix of the tool with compound additives is successfully restrained from shrinkage and prevented from dehydration failure. And the holding force of the abrasives in the matrix is effectively enlarged by chemical bond after adding the coupling agent, avoiding the loss of the abrasives. When lapping and polishing two kinds of typical hard and brittle substrates with this gel-bonded ultrafine diamond tool, an ultra-smooth and scratch-free surface with nanoscale even sub-nanoscale precision can be obtained.

关 键 词：凝胶结合剂 超细金刚石 磨抛加工 基片 

分 类 号：TG356[金属学及工艺—金属压力加工]