Study On Improving The Properties Of Electrodeposited Diamond Tools By Applying Magnetic Field During The Production

Based on the researches of the applied magnetic field effects on the microstructure of metal or alloys plating and the impacts of diamond grain's magnetism on the properties of electrodeposited diamond tools, this study introduced the magnetic field in electrodeposited diamond tools processing to improve the overall quality of diamond tools. This study, I investigated the impacts of mainly two kinds of magnetic field, static and alternate magnetic field, on the various Ni-Co plating respectively. Some effective researching and analyses apparatus such as metallographic analyzer, scanning electron microscopy (SEM), microhardness tester and X-ray diffraction was used in this study. The results were summarized and illustrated as following:(1) With the application of magnetic field, the properties and microstructure of the plating were changed due to various reasons such as magnetohydrodynamic (MHD) effect, but the crystalline structure of the plating was not changed still to be fcc.(2) Although the properties of plating was dramatically changed with the application of static magnetic field, but the morphology and qualities of diamond tools were not so many differences with before , to some extent, some more deteriorating phenomena were remained under observation. Meanwhile, all the properties of plating and diamond tools were significantly changed with the application of alternate magnetic field, the deteriorating phenomena of nodules and over-plating was decreased, the gaps between diamond grains and matrix narrowed or eliminated and the matrix surface microstructure seems refined.(3) The microhardness of plating was not improved so much only about 30-40 HV after static magnetic field applied and was enhanced by almost 165HV after alternate magnetic field applied.(4) Shown by the cutting test, the service life of the electroplated diamond tool that was prepared with the applied magnetic field was 1.3-1.5 times than the tools prepared without the alternate magnetic field, the working efficiency can be raised by 20.21-30%.(5) A new method was supplied with this paper for the exploration of deposition mechanism in electroplating process due to the study of depositing style of the cation.(6) A novel improving technique of the eletrodeposited diamond tools was supported by this paper which was economical (no additional chemicals, low cost), environmentally friendly (no additional sources of pollution) and effective.