A composite ceramic material for an abrasive tool

Abstract

The paper describes the features of the electrochemical formation of a modern abrasive tool material. The technology for obtaining the material consists in obtaining a composite diamond-bearing ceramic layer on the surface of diamond-aluminum sintered blanks by microarc oxidation. It was established that the degree of diamond metallization with copper and the relative density of a sintered blank affects oxidation the most. It was impossible to obtain a composite ceramic material by microarc oxidation with diamonds coated with nanodispersed copper with a metallization degree of over 100%. The relative density of sintered blanks should be 80–90% to form a composite material with optimal physicomechanical and tribotechnical properties. Diamond concentration did not affect the creation of stable spark discharges that form aluminum oxide. The optimal alkali concentration in the electrolyte to reach the maximum thickness of the diamond-bearing composite material was about 2 g/l. Comparative tests showed that the wear resistance of a diamond-bearing composite material with a ceramic matrix based on aluminum oxide was notably higher than traditional analogues under similar friction conditions. Finally, the paper determines the scope of the obtained diamond-bearing ceramic material as a tool for precision processing of superhard materials in precision engineering, instrumentation engineering, and the medical industry.