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Multicomponent (Ti-Zr-Hf-V-Nb)N Nanostructure Coatings Fabrication, High Hardness and Wear Resistance

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Pogrebnjak A., Beresnev V., Kolesnikov D., Bondar O., Takeda Y., Oyoshi K., Kaverin M., Sobol O., Krause-Rehberg R., Karwat C.

First results in the field of synthesis and research of the multicomponent (Ti-Zr-Hf-V-Nb)N nanostructured coatings are presented in the paper. Influence of processes of spinodal segregation and mass-transfer on single-layered or multilayered crystal boundary (second phase) forming were explored. Superhard nanostructured coatings were investigated before and after annealing at the temperature 600°C using unique methods (slow positron beam, proton microbeam particle induced X-ray emission-μ, Rutherford backscattering-analysis, scanning electron microscopy with energy dispersive X-ray spectroscopy, X-ray diffraction analysis was performed using DRON-4 and nanoindentor). Diffraction spectra were taken point-by-point, with a scanning step 2Θp=0.05 to 0.1°. We detected that positron trapping by defects was observed on the nanograins boundaries and interfaces (vacancies and nanopores which are the part of triple and larger grain's boundary junction). The 3D distribution maps of elements obtained by the proton microbeam (particle induced X-ray emission-μ) together with the results obtained by slow positron microbeam gave us comprehensive information about physical basis of the processes, connected with diffusion and spinodal segregation in superhard coatings.

Formation of Multilayered Ti-Hf-Si-N/NbN/Al_2O_3 Coatings with High Physical and Mechanical Properties

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Pogrebnjak A., Prozorova M., Kovalyova M., Kolisnichenko O., Beresnev V., Oyoshi K., Takeda Y., Kaverina A., Shypylenko A., Partyka J.

This work presents the first results on forming of multi-layered superhard coatings Ti-Hf-Si-N/NbN/Al_2O_3 and their properties as well as structure. Microstructure, elemental and phase compositions of multi-layered coatings obtained by different methods were investigated. There were used such methods as: scanning electron microscopy EDS JEM-7000F microscope (with microanalysis) for research of cross-section of coatings, with subsequent Auger-electron spectroscopy, X-ray diffraction analysis, optical inverted microscope Olympus GX51, electron-ion microscopes Quanta 200 3D and Quanta 600 (scanning electron microscopy), equipped by the detector of X-ray radiation of the system PEGASUS 2000. It was stated that hardness of coatings has reached 56 GPa, and at the same time the factor of wearing during friction was the smallest - 2.571×10^{-5}. It was also noted that nitrogen pressure in the chamber at the deposition of the top layer significantly influences on the properties of samples. For example, the coefficient of friction at P=0.3 Pa from 0.2 at the beginning of track to 0.001 (during the tests), and at the pressure of nitrogen P=0.8 Pa, the coefficient of friction was equal to 0.314 at the beginning of track and 0.384 at the end (during the tests).

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2 Acta Physica Polonica A

2 2013

2 Beresnev V.

2 Oyoshi K.

2 Pogrebnjak A.

2 Takeda Y.

1 Bondar O.

1 Karwat C.

1 Kaverin M.

1 Kaverina A.

1 Kolesnikov D.

1 Kolisnichenko O.

1 Kovalyova M.

1 Krause-Rehberg R.

1 Partyka J.

1 Prozorova M.

1 Shypylenko A.

1 Sobol O.

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Multicomponent (Ti-Zr-Hf-V-Nb)N Nanostructure Coatings Fabrication, High Hardness and Wear Resistance

Formation of Multilayered Ti-Hf-Si-N/NbN/Al_2O_3 Coatings with High Physical and Mechanical Properties