Main special features of formation of multicomponent hot gas sprayed coatings determining the physicomechanical properties of compositions in spraying

A study of internal friction anomalies in stainless steel with nanostructured plasma coating

“…Nanopowders were ultra-fine particles (about 60 nm in diameter) based on aerosil (SiO 2 ), alumoaerosil (SiO 2 •Al 2 O 3 ), and titanaerosil (SiO 2 TiO 2 ) [8,13,17,26].…”

“…The effect of coatings is also manifested in the change, and in many cases, in the appearance of new effects in the energy absorption spectrum, in particular, in the area of grain-boundary relaxation [13,14]. In addition to the main grain-boundary peak (GBP), in most cases, in the temperature range of 550-800 °C, there appear additional peak effects that shift along the temperature scale depending on the coating composition.…”

“…A quantitative assessment of the dislocation structure is based on the results of measurements of the amplitude dependence of internal friction, according to the Granato-Luque theory [2,5,12,13]. The research on the complex spectrum of energy vibrations in the "base-coating" system has laid the basis for a model that takes into account different zones of influence on the IF -volume and surface layers of the base and the type of coating [14].…”

“…Research on the temperature and the amplitude dependences of internal friction (TDIF and ADIF) allows formulating the basic provisions of the mechanism of high damping, depending on the composition and structure of the coatings [5,14,15]. At the same time, research on the energy dissipation on TDIF and ADIF in coated structural materials reveals a change in the general background and the appearance of new anomalies [13,14]. Such circumstances necessitate additional research to better understand these phenomena.…”

“…Analysis of the IF measurements reveals additional information on structural and phase features of various zones along the composition cross section [5,13,14]. Research on the temperature and the amplitude dependences of internal friction (TDIF and ADIF) allows formulating the basic provisions of the mechanism of high damping, depending on the composition and structure of the coatings [5,14,15].…”