Further progress in industrial electrochemical generators' designs utilising SOFC considerably depends on problem of obtaining fuel cell materials with predefined properties [1,2]. Due to this fact, considerable efforts of designers are directed on creation of optimum composition «anode-electrolyte-cathode», and on microconstruction of SOFC materials (selection of phase and element composition, defect structure formation, etc.). In the second problem nanocomposite systems having unique properties are of greatest interest [3]. Utilising of such materials as solid electrolyte may allow significantly improve cell's parameters, in particular, increase ionic conductivity [4,5]. However mechanisms leading to this effect were not determined singly. In this article the influence of nanoparticles ensemble with work of exit that different from the rest of the matrix on the change of electron density in SOFC materials have been examined theoretically. The calculations of concentration distribution of free carriers around single particle and for microparticles ensemble were fulfilled. In conclusion possible directions of forming of nanostructures conformably to SOFC materials discussed.

The work is devoted to the search for new vacuum-plasma coatings with high hardness to increase the durability of the compressor blades of the GTE of aircraft engines Ti-Al-N-based vacuum-plasma coatings obtained by Avinit technologies, which ensure the application of hard, high-quality coatings with dramatically reduced micro-arc damage, were selected as candidates. Avinit multilayer coatings have higher functional characteristics than TiN (microhardness, crack resistance, temperature resistance, erosion and corrosion resistance) and may be promising for applying erosion-resistant coatings for compressor blades. Avinit technologies are technologically closest to the vacuum-plasma technologies used in industrial production for applying TiN protective coatings. New multi-layered 2D nanocomposite wear-resistant ion-plasma hard coatings Avinit (TiN-AlN)n have been developed. The created software products made it possible to reach a qualitatively new level in terms of further modification and improvement of the designs of Avinit functional coatings, stability of technologies and improvement of their quality control when applying such coatings for use in the production of compressor blades of gas turbine engines of aircraft engines. Special attention is paid to methods of preliminary ion-plasma treatment of surfaces before coating. Metallographic studies of the chemical and phase composition and structure of Avinit (TiN-AlN)n coatings have been carried out. The thickness of the coatings is 7–9 μm, the microhardness is 34–35 GPa (compared to the serially used TiN coating: 27.4 GPa). The use of three-stage ion-plasma treatment in Avinit technologies using a double vacuum-arc discharge followed by the application of strengthening coatings in a single technological cycle eliminates the formation of cracks and ensures the production of tightly bonded, high-quality coatings of a given composition with the maximally reduced share of the droplet component. The developed coatings (TiN-AlN)n were applied to experimental batches of working compressor blades of GTE aircraft engines for bench tests.

Abstract. The surface morphology and phase composition of the coatings obtained by magnetron sputtering of Cu-MoS2 composite targets have been studied by X-ray diffraction, scanning electron microscopy and X-ray spectral microanalysis. X-ray diffraction studies of coatings show presence of two crystalline phases, namely Cu with face-centered cubic lattice and CuMo6S8 with a rhombohedral lattice. Studies of the surface morphology in Cu-CuMo6S8 coatings revealed two types of structures. One of the structures is realized in the form of globular formations, while the second is similar to the structure that had single-component Cu coating. X-ray spectral microanalysis showed that globular formations have higher Mo and S contents in comparison with other type of surface structure. The ratio between these elements is close to that in СuMo6S8. However, the Сu content is many times higher than the calculated amount for this compound. This suggests that globular formations are heterostructural where only one of the phases is CuMo6S8. Other possible phases in globular formations should be based on copper. The total area of globular formations in the coating increases with an increase in the proportion of MoS2 in the composition of the Cu-MoS2 sputtered composite target and strongly depends on the substrate potential. Key words: magnetron sputtering, coatings, copper, molybdenum disulfide, structure, composition, Chevrel phases.

The investigations of the reactive magnetron depositing of the stoichiometric coatings “metal-metalloid” were done. The dependences between sputtering parameters of a target and processes of plasmochemical formation on the surface of sample “metal-metalloid” and formations of coatings of the appropriate structure were investigated. Experimental data on stoichiometric coatings AlN, Al 2 O 3 , TiN, TiO 2 is given. Features of reactive magnetron deposition and investigation results for obtaining of coatings with pregiven properties in particular for providing stability and controllability of coating deposition processes in time.

A document by Alex Sagalovich. Click on the document to view its contents.

A set of programs for the numerical simulation of the diffusion decomposition processes was developed by using simulation methods, kinetic and particle method. The complex has been validated on the model system Ni-Al by the growth of-phase separations. The results on the evolution of the distribution function and other characteristics of the ensemble, which in the zero volume fraction approximation are asymptotically in good agreement with the theory and the experiment, have been obtained. The peculiarity of the created program complex is the possibility of its adaptation to the description of the decomposition of multicomponent multiphase systems.