Key Engineering Materials Vol. 822

Abstract: Geometric features of mesh structures allow them to be used as a material for medical purposes. In this paper, the study of the properties of lattice structures, performed by selective laser melting was carried out. The range of high accuracy of manufactured samples and microstructure was determinated. The results of changes in porosity and mechanical properties after hot isostatic pressing in comparison with cortical bone and heat treated material and microstructure of samples are represented.

Abstract: The paper presents the study results of the selective laser melting process of the Ti-6Al-4V alloy and nanosized powder TiC composition. The results of the particles morphology study of resulting powder composition after blending are presented. The microstructure and mechanical characteristics of the obtained composite material were studied. Study of microstructures using optical and electron microscopes were conducted.

Abstract: The paper presents the study of lattice structures and deviations in them caused by the phenomena of the selective laser melting. Experimental samples were compared with their computer models and deviations were assessed. The most accurate control method for this material was determined and relative density was calculated from the results of the method.

Abstract: The Langmuir probe plasma parameters diagnostics method was studied based on the ICP plasma chemical processing system. Single Langmuir probe with high-frequency compensation system and the special electrical circuit was designed and constructed. CV dependences in various working pressures were registered.

Abstract: . The calculation of nominal values of the matching device for the modified plasma chemical etching installation "Plasma 600T" was based on the estimated values of the discharge impedance (plasma). It turned out that for optimal performance, one can use a matching device consisting of two capacitors whose capacitances are: С₁ [20; 1000] pF, С₂ [4; 100] pF, and inductor with inductance 2,5 μH.

Abstract: The present work deals with investigation of the powder stainless steel Fe-16Cr-2Ni-Mo-Mn, obtained by mechanical alloying and the study of samples obtained from mechanically alloyed powders by spark plasma sintering. The effect of treatment time on the doping process was shown. The influence of sintering conditions on the microstructure and mechanical properties of the samples was revealed.

Abstract: The practice shows availability of an electro plasma method polishing. The lack of a method, namely impossibility of its application for processing extended grooves and apertures is known. Creation of a special equipment and revealing of optimum modes have allowed to receive the given roughness on the named surfaces on products from cuprum.

Abstract: Synthesis of the Nb-Si in-situ composite was attempted by mechanical alloying of element powders in vario-planetary ball mill. The particles size distribution was measured by laser diffraction, microstructures were examined with scanning electronic microscope, and the phase constituent were analyzed by X-ray diffraction. The amorphization of the Si during mechanical alloying, large amount of deformation of Nb crystal structure, and after all – the formation of supersaturated solid solution of Nb was observed. To stabilize microstructure and phase composition, a spark plasma sintering was attempted. After SPS microstructure consist of three main phases – Nb_ss, Nb₅Si₃ and Nb₃Si.

Abstract: We studied in detail the process of producing nanosized aluminum nitride using inductively coupled nitrogen plasma from micron powder of pure aluminum. The phase and granulometric composition of the obtained nanopowders, as well as their morphology, was studied. The influence of various parameters (initial components, gas flow rates, feed rate of the initial powder, etc.) on the synthesis result is determined. Received nanodispersed Al-AlN powder with particle sizes up to 300 nm and aluminum nitride content from 11.6 to 48.8%.

Abstract: Technological difficulties of manufacture, typical to the large number of crucial elements of certain assemblies: tubes of fuel systems, details of waveguide devices, smooth gun barrels and other tubular details. Difficulties associated with the finishing of the internal surfaces of these products. Therefore, great interest is to find a finishing technology, which allow processing such products. The kind of electrolytic-plasma polishing technology - forced electrolytic-plasma polishing (FEPP) allows to receive homogenous quality of an internal surface layer along processed tubular work piece.