Drobyshevska A. The structure and properties of combined nanocomposite protective coatings TiCrN/Ni-Cr-Fe-B-Si and TiAlN/Ni-Cr-Fe-Si-B

Object: two-layer coatings TiCrN/Ni-Cr-Fe-Si-B and TiAlN/Ni-Cr-Fe-Si-B received by methods of plasma-detonation and ionic-plasma deposition. The purpose: working out of physical-technological bases of two-layered nanocomposite coatings TiCrN/Ni-Cr-Fe-Si-B and TiAlN/Ni-Cr-Fe-Si-B creation, the determination of their structural-phase, mechanical and corrosion characteristics. Methods: plasma-detonation deposition of a powder, vacuum-arc and magnetron deposition of films, the raster electronic microscopy, transmission electron microscopy, the x-ray microanalysis, Rutherford backscattering, measurement of hardness and corrosion resistance, the electrochemical analysis. Results: first established that in the surface layers of combined coating TiCrN/Ni-Cr-Fe-Si-B intermetallic connections are formed. Except the basic phases the presence of Cr2Ti, Fe3Ni, (Fe, Ni) N and also the combinations of titan with nickel (Ti2Ni, Ni3Ti, Ni4Ti3, etc.) is revealed. It is shown that in a solid solution (Ti, Cr) N the nanosized (2,8-4)nm are formed . It is detected that in combined nanocomposite coating TiAlN/Ni-Cr-Fe-Si-B the TiAlN phase with the size of grains (18-24)nm and also Ti3AlN+Ti3Al2N2 and Al5Ti3+Ni3Ti phases with the sizes of grains (35-90)nm are formed. It is found that the given mechanism of deposition of the combined coatings can influence on wear resistance of the formed surface due to the phase transformations. Field of application: physics of solid state, physics of thin films, nanophysics