NANOCOMPOSITE COATINGS BASED ON Ti-N-Cr/Ni-Cr-B-Si-Fe, GAINED BY TWO TECHNOLOGIES

The first results of manufacturing and investigations of a new type of nanocomposite protective coatings are presented. They were manufactured using a combination of two technologies: plasma-detonation coating deposition with the help of plasma jets and thin coating vacuum-arc deposition. We investigated structure, morphology, physical and mechanical properties of the coatings of 80 divided by 90 mu m thickness, as well as defined the hardness, elastic Young modulus and their corrosion resistance in different media. Grain dimensions of the nanocomposite coatings on Ti-N-Cr base varied from 2.8 to 4 nm. The following phases and compounds formed as a result of plasma interaction with the thick coating surface were found in the coatings: Ti-N-Cr (200), (220), y-Ni-3-Fe, a hexagonal Cr-2-Ti, Fe-3-Ni, (Fe, Ni) N and the following Ti-Ni compounds: Ti2Ni, Ni3(T)i, Ni4Ti, etc. We also found that the nanocomposite coating microhardness increased to H 31.6 +/- 1.1 GPa. The Young elastic modulus was determined to be E 319 +/- 27 GPa -it was derived from the loading-unloading curves. The protective coating demonstrated the increased corrosion resistance in acidic and alkaline media in comparison with that of the stainless steel substrate.