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Mechanical and structural properties of multilayer c-BN coatings on cemented carbide cutting tools

: Park, S.-T.; Han, J.-G.; Keunecke, M.; Lee, K.


International journal of refractory metals and hard materials 65 (2017), pp.52-56
ISSN: 0263-4368
Journal Article
Fraunhofer IST ()
cubic boron nitride; R.F. diode sputtering; interlayer

Multilayer cubic boron nitride (c-BN) coatings represent a new deposition method that can improve adhesion on metal substrates. The multilayer c-BN system in this study consisted of a TiAlN interlayer (2– 3.5 μm), boron carbide (~ 1 μm), and a c-BN (~ 2 μm) gradient layer. This multilayer c-BN structure, exceeding 5 μm in thickness, showed outstanding adhesion in atmospheric conditions even with high residual stress. Compared to monolayer c-BN coatings, the multilayer c-BN films had lower elastic moduli, and their critical loads were twice as high. The adhesion of the multilayer c-BN system was significantly improved because of the induced stress relaxation.