Study Of The Techniques To Enhance Bonding Strength Between Diamond And Matrix In Electrodeposited Diamond Tools

This paper mainly studied how to enhance the combination of diamond grains and matrix by surface modification technique and the application of this special surface treatment method of diamond grains in electrodeposited diamond tools. The experiments based on the analysis of diamond surface modification mechanism and samples were observed by SEM. Through the analysis of diamond surface modification mechanism, strong oxidization and reduction treatment were confirmed as the main surface treating techniques in this research. After strong oxidization the surface wettability of diamond grains were improved due to the appearance of chemical bonding on the skin structure of diamond such as–OH, -COOH, C=O, while the diamond grains were purified and coarsened in this process. The purpose of surface reduction is making scattered nickel spots emerge on the diamond surface. The scattered joints between diamond grains and matrix were clear in SEM pictures after producing diamond tools and the optimum parameters for preparing diamond tools were confirmed based on the previous researches, and the impact factors (such as time and temperature) of reducton were studied. The main work and results were as following:1. The contacting areas and mechanical interlocking between diamond grains and matrix were improved due to the lots of concaves appearing on the surface of diamond grains after surface strong oxidization. The wear resistance property and service life of diamond tools were enhanced tested in the application, the nodules were sharply decreased by observing the morphology of the diamond tools through SEM.2. After reduction treatment of diamond grains employed the metallic bonding between diamond grains and matrix were proved by the scattered Ni-Co joints emerging between them clearly shown in the SEM pictures. Obviously the bonding strength between diamonds and matrix was greatly enhanced. These phenomena can effectively enhance the wear resistance property of diamond tools.3. The optimum parameters of diamond surface modification were obtained by the method of perpendicular experiments.4. The diamond tools with choiceness properties were successfully prepared using previous techniques.