Vacuum brazing diamond tools has become a hot spot in the research of superhard abrasive tools because of its unique advantages. At present, vacuum furnace brazing and high-frequency induction brazing are the main preparation methods of diamond tools for high temperature brazing. These two methods have their own advantages and application scope, but also have their own shortcomings and technological limitations.  In the long run, in the field of soldering tools of production, they are further perfection and development of space in high frequency induction brazing furnace brazing and has, on the basis of research results, we put forward to adopt laser as a heat source, the idea of making high temperature brazing diamond tools, trying to open a new way of diamond brazing.

Now our work mainly includes :(1) through the analysis of the principle and type of thermocouple temperature measurement, the final determination of the use of "split" standard thermocouple method for vacuum brazing temperature measurement.  The temperature of vacuum brazing was measured by orthogonal test, and the parameters of laser brazing process were obtained by optimization test.   The results of this test are of great significance to determine the dosage combination conditions of vacuum brazing.   (2) On the basis of the improvement of vacuum brazing gas protection device, the vacuum brazing test of diamond abrasive was carried out by using Ni-Cr alloy active filler metal as connecting material under the protection of argon.   The experimental results show that the brazing quality is better when the laser line energy density is 244 ~ 256J/mm2.   The morphology and physicochemical analysis of brazed diamond tools samples were observed by three-dimensional stereographic microscope, scanning electron microscope, EDS and X-ray diffractometer.   The results show that the active element Cr in the solder diffuses and enriches the diamond surface, and the flat strip carbide Cr3C2 is formed by direct epitaxy on the diamond surface, and the chemical metallurgical combination is formed at the interface between diamond and solder.   (3) The vacuum brazed diamond grinding wheel was successfully developed.  The machining performance test showed that the wear pattern of the diamond grinding wheel made by vacuum brazing was mainly in the form of complete crystal shape, attrition, angular breakage and fragmentation, and no abrasive fell off during the grinding process.   The wear pattern of diamond abrasive has great influence on grinding force, and the change of grinding force accelerates the change of wear pattern of diamond abrasive.

At present, our research results provide a reference for further improving the manufacturing technology of vacuum brazing diamond tools.