Аннотация
Complex-alloyed (Cr, Si, Fe, Zr, Mo) anodic alloys based on NiAl smelted by liquid-phase self-propagating high-temperature synthesis (SHS) from oxides (NiO, Cr2O3, MoO3) and baddeleyite−zirconium mineral concentrate, were used to produce coatings on steel 45 (cathode) by electrospark deposition method (ESD). The influence of different concentrations of Mo (0.6 – 7.8 wt.%) in the composition of anodic alloys and different impulse energy of electric spark (E1= 0.312 and E2 = 0.72 J) on the abrasive wear resistance of coatings was studied. Maximum increase in wear resistance (5 times) was achieved when coatings were formed by electric spark pulses with energy E2 and complex alloyed anodic alloys containing 3.5 wt.% Mo were used. Microstructure of the coatings is represented by columnar crystallites normally oriented with respect to the cathode surface and relatively regularly located transverse microcracks. Separate areas were found in the coatings that had a two-layer structure and were free of microcracks. It has been established that the formation of microcracks is prevented by the lower (relative to the cathode) layer, which has an increased Fe content in the crystallites (17 or more at.%), in contrast to the usual content — up to 5 at.%.
Финансирование на английском языке
1. Ministry of Science and Higher Education of the Russian Federation - 075-01108-23-02