Effect of the Tool Composite Porosity on the Efficiency of Profile Diamond Grinding of Sapphire and Zirconium Dioxide

The efficiency of diamomd grinding of the sapphire and polycrystalline zirconium dioxide spherical surfaces with a diamond tool based on a metal binder with a reduced spread of porous inclusions in size is experimentally investigated. The tool composite is compacted using polyethylene glycol modified with adamantane derivatives, which increases the nonlinearity of the humidifier flow at the stage of briquetting. It is shown that the amplitude of the coefficient of friction decreases by a factor of 3 when such a composite is in friction with zirconium dioxide compared to sapphire friction. In addition, scratches are observed on the polished surface of sapphire in contrast to the case of grinding of zirconium dioxide, to exclude which it is advisable to make sure that the structure of the porous space of the composite has not only a certain size distribution of porous inclusions, but also a reduced value of their most probable size. The parameters of the relative productivity and wear of the diamond tool when grinding sapphire and zirconium dioxide differ by a factor of 2 to 3 depending on the grit size of the abrasive material. The surface roughness of polycrystalline zirconium dioxide upon its fine grinding is generally four to five times lower than that of sapphire.