After the electroless plating of diamond, the obvious boundary between the diamond and the nickel-cobalt-based coating disappeared, and some scattered nickel-cobalt joints were grown on the bonding surface of the diamond and the coating [21]. The electroplated diamond tool was prepared from the activated diamond, and the material removal amount was 1.5 times that of the unactivated treatment when grinding the Al2O3 ceramic workpiece [21]. However, with this method, the diamond particles and the coating may be chemically combined in the original sense, and the true chemical bond is not achieved, and the intermolecular force may account for a larger proportion.
3.2 CVD method [22]
Using diamond CVD deposition technology to repair the prepared diamond tools, not only can the newly formed diamonds be deposited in the gaps in the tool, but also the diamond particles in the tool can be regenerated, and the surface is further developed and improved. Particle properties. The MPCVD method has been successfully used for void repair occurring between diamond particles and carcass metal after electroplating. Observation of the surface topography of an electroplated diamond tool prepared using diamond particles having an average size of 16 μm under SEM revealed irregularities and irregularities in the surface, and concave and voids between the diamond particles and the carcass metal. The tool was placed in an MPCVD system and the average size of the diamond particles was increased to 25 μm. The gap between the diamond particles and the carcass metal was compensated by SEM and the surface of the diamond particles was regular and full [22]. This method is used to repair the electroplated diamond tool, which has higher cutting force, wear resistance and particle bonding than the unrepaired electroplated diamond tool. At high temperatures during the MPCVD process, carbon-metal bonds are formed between the diamond and the carcass, creating a strong bond between the diamond particles and the carcass metal [22].
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