Surface Modification of Fine Diamond Grains by High-Frequency Magnetron Sputtering

高频磁控溅射对细金刚石晶粒进行表面改性

基本信息

批准号：
10650128
负责人：
SEMBA Takuya
金额：
$ 2.05万
依托单位：
Fukuoka Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

A spherical diamond wheel with fine grains and superior wear resistance should be adopted for the finishing process of free-formed dies and molds in cases where numerically controlled mirror grinding is performed. An electroplated diamond tool in which diamond grains are electrodeposited with nickel ions exhibits superior wear resistance compared with conventional wheels produced by the power metallurgy process. However importance is given to shape accuracy and grinding performance of the tool, thus only a single layer of diamond grains is electrodeposited on the tool body. Hence, the tool life in which the cutting edges of the single-layered diamond grains on the tool body remain sharp is limited. The tool life of the electroplated tool can be increased by using an electroformed tool in which thickly stacked diamond grains are electrodeposited with nickel ions. However, the conventional sediment codeposition technique requires an extremely long time for the production of thick coatings, since a series of processes consisting of vigorous agitation, sedimentation of floating grains and electrodeposition must be conducted repeatedly. In this study, a low-speed agitation technique is newly developed to produce thick composite coatings with high grain density to overcome the disadvantages of conventional techniques. High-speed electroforming is conducted by agitating sedimented grain particles at a low speed to increase the electric conductivity. In addition, the gripping strength of diamond grains to the bond material is increased by covering grain surfaces with oxide coatings.

在执行数值控制的镜面磨碎的情况下，应采用具有细晶粒和优质耐磨性的球形钻石轮。与通过功率冶金工艺产生的传统车轮相比，用镍离子电沉积的钻石晶粒的电镀钻石工具具有出色的耐磨性。然而，重要性对于塑造工具的准确性和磨削性能，因此在工具主体上仅电沉积单层。因此，工具主体上单层钻石晶粒的切割边缘保持锋利的刀具寿命是有限的。电镀工具的工具寿命可以通过使用电动型工具来增加，其中厚厚的钻石晶粒用镍离子电沉积。但是，传统的沉积物代码技术需要很长时间才能生产厚涂层，因为一系列由剧烈搅动组成的过程，浮动晶粒的沉积和电沉积必须反复进行。在这项研究中，新开发了一种低速搅拌技术，可生产具有高晶粒密度的厚复合涂料，以克服传统技术的缺点。通过低速搅拌沉积谷物颗粒以增加电导率来进行高速电动构造。另外，通过用氧化物涂层覆盖谷物表面，钻石晶粒对粘合物材料的抓地力会增加。