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In the presented paper the experimental results concerning the functional quality (durability during steel machining) of thin, superhard coatings produced on the cutting edges are described. Differences among mentioned properties of coatings mainly result from a coating structure. But the structure of coatings results from deposition parameters Superhard boron nitride coatings were deposited on insert cutting edges made of cemented carbides by the pulse-plasma method applying different values of the discharge voltage. The comparative investigations of mentioned coatings have been concerned of tool life of edges during hard machinable material machining (nitriding steel hardened in oil). In these investigations for the purpose of additional increase of coatings adhesion to substrates an interfacial layers were applied.

Tool life of the edges coated with the c-BN+h-BN coatings with different structures during hard machinable steel machining