Mechanical properties of surface layer of cutting elements from polycrystalline superhard composites based on cubic boron nitride

摘要

Abstract. It was proposed to evaluate the parameters of surface layer’s mechanical properties of the working elements of the cuttingtools from polycrystalline superhard composites based on cubic boron nitride on the basis of the results of scratch tests. The theoretical rationale of the method was represented and the thermodynamical indicators of mechanical properties of surface layer (the value of the activation barrier of the entropy production start and its production ability when dozed impact was applied) were considered. There were showed the results of the experimental researches of the working capability of the cutting tools from superhard composites, obtained then machining the hardened steels which affirm the theoretical calculation.