Structure and properties of condensed gradient coatings with NiAl-bond coat doped with Y or Dy

Doping of reactive elements (RE) as Y or Dy into the composition of NiAl bond coat in EB-PVD thermal barrier coatings (TBC) leads to an increase of performance characteristics of the latter. The report contains results of structure and property investigation of NiAl / ZrO2-8% Y2O3 condensed TBC. Thickness of the condensed TBC is 40 ... 50/140 ... 160 μm done on Ni-based super alloy samples-buttons. The effect of Y or Dy dopants into NiAl bond coat, including their gradient distribution through-the-thickness of NiAl layer was considered as well. It was found that the additions of REs reduce the average grain size of the condensed NiAl layer by 4-5 times. It was shown that REs precipitate both inside the NiAl grains and along boundaries in the form of particles ranging in size from 5 nm to 20 mcm, depending on the level of their concentration. REs optimal content was estimated to ensure the highest thermal cyclic durability. It is noted that positive effect of Dy doping into NiAl (in comparison with Y) occurs due to improvement of adhesion of the scale layer because of the growth of spindle-shaped precipitates of dysprosium oxides in it, slowdown of the growth rate of Al2O3 scale at the metal-ceramic interface and inhibition of interdiffusion of Al (about 1,2 times) in TBC-super alloy system

Визначення локальних деформацій в околі зварного шва нікелевого сплаву за даними енергетичних Фур’є спектрів картин Кікучі

A discrete two-dimensional Fourier transform and the power Fourier spectrum are used for determination of average strains near cracks in a welded seam of Ni-Cr-Fe alloy. The alignment of Kikuchi images with the help of genetic algorithms and subtraction of white Gaussian noise made it possible to more fully take into account the influence of instrumental factors on the formation of electron backscatter diffraction patterns.Для визначення значень середніх деформацій в локальних областях поблизу тріщин зварного шва нікелевого сплаву NiCrFe при аналізі картин Кікучі використано методи енергетичного Фур’є спектру та дискретного двомірного Фур’є перетворення. Суміщення зображень Кікучі за допомогою генетичних алгоритмів та виділення білого гаусівського шуму дало можливість більш повно врахувати вплив інструментальних факторів на формування картин дифракції відбитих електронів

The problem of studying the best educational experience

In this paper the peculiarities of the views of scientists on the issues of determining the essence of good teaching experience, its dissemination and implementation in practice of education. The main stages of studying advanced pedagogical experience. It is shown the features of each stage. It is given the definition of best educational experience. Highlighted key terms that are used in the theory and practice work with the best educational experience

Networking Between Engineering University and Enterprises in Future Students Training

This article shows the experience of engineering university in working with future students through the organization of network cooperation with partner enterprises. The article also analysis the efficiency of such forms of networking as a creation and development of children technopark, method of professional tests of engineering talented children, participation in professional skills competition of young professionals WorldSkills Junior, competitions of school children innovative projects etc. © 2020, Springer Nature Switzerland AG