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The following topics are dealt with: new materials; nanotechnology; information technologies; mechatronics and automation; power engineering; resource saving; environmental protection.
It is displayed, that out-of-vacuum electron-beam surface hardening represents effective production engineering of a reinforcement of the steels, ensuring a high level of their cyclic crack resistance. It is determined, that the fatigue stressing superficially hardened not tempered steels is accompanied intercrystalline fracture, despite a small size of the former austenitic grains. Raise of fatigue...
Nanoparticle La1-xCexCoO3+delta (x les 0.1) cobaltite oxide powders with perovskite structure was synthesized at different calcination temperatures using the amorphous heteronuclear complex La1-xCexCo(DTPA)middot6H2O (x = 0.1) as precursor. The effects of the calcination temperature was examined by XRD, TEM methods. The crystal structure of perovskite type La1-xCexCoO3+delta (x les 0.1) was refined...
The interaction of solid basic bismuth nitrate (BBN) with citric acid solutions is studied. The formation of bismuth citrate of the type BiC6H5O7 occurs in the temperature range 50-70degC at pH 0.5-0.7. The obtained product is characterized by the methods of chemical analysis, X-ray powder diffraction, IR spectroscopy and differentional thermal analysis. The method of synthesis of bismuth citrate...
The behavior of surface layers of metals with a different lattice type (Cu, W, Ti) during friction is investigated in the present paper. The experiment by using synchrotron radiation diffractometry is carried out in the regime of simultaneous triboloading and high-sensitive diffraction pattern registration. It is determined that the dislocation structure as well as residual stresses of two kinds for...
Results of CO2-laser butt and scarf welding of titanium alloy VT20 plates, 2 mm thick, with use of nano-powdered inoculators and without inoculating agents are presented. Satisfactory mechanical properties of weld joint without powders as well as with use of powdered inoculators are obtained. However, introduction of nano-powders of refractory compounds TiN, Y2O3 and their compositions allowed us...
Wear is one of the big problem in mining industry. Most of details mining equipment working under deferent type of wearing and need to design new material and properties. Our designed engineering material is good answer for solving some above mentioned problems and have to continue a research work in direction of improving special properties.
The adsorbent materials were prepared by mixing PS and RPF using physical activation method. The starting PS consists of inorganic components of SiO2, CaO and Al2O3 and RPF has mainly high amount of carbon. The commercial activated carbon was used as a reference material to compare with the prepared samples. The prepared samples show the crystalline phases of calcite (CaCO3) anorthite ((Ca, Na) (Al,...
Steel with 5%Cr for cold rolling rolls is investigated in this paper. Kinetics of the supercooled austenite transformation is studied. The influence of the quenching temperature on the structure and properties of roll steels is investigated. The size of austenitic grain, the amount of residual austenite, hardness and martensite transformation start temperature are determined. The susceptibility of...
The properties of reactive hot melt polyurethane adhesives (RHAs) modified by dihydroxyl-terminated reactive acrylic macromonomers were examined and compared with those of RHAs modified with a non-reactive commercial acrylic copolymer. The melt viscosity and initial bond strength was increased when a portion of the polyols and tackifier was replaced by macromonomers or acrylic copolymers, which have...
Graphite oxide (GO)/poly(methyl methacrylate) (PMMA) nanocomposites were prepared with a novel method utilizing macroazoinitiator (MAI). The MAI which has a poly(ethylene oxide) (PEO) segment was intercalated between the lamellae of GO so that it can induce the inter-gallery polymerization of methyl methacrylate (MMA) to bring the exfoliation of GO. The morphology, conductivity, thermal, mechanical...
The simulated load spectrum is constituted for the automobile muffler structure using probabilistic random process with the measured load data. By applying obtained spectrum load and evaluating residual strength degradation and failure probability, its fatigue life is assessed on the basis of two parameter Weibull distribution. To determine the required strength degradation model parameters, experimental...
Bismuth (III) subgallate trihydrate C6H2(OH)3COOBiOmiddot3H2O was synthesized by precipitation from bismuth nitrate solutions by adding an aqueous solution of gallic acid as well as by the reaction of oxohydroxobismuth (III) nitrate trihydrate with a solution of gallic acid. The precipitates so produced were investigated by means of X-ray phase analysis, thermogravimetry, electron microscopy, IR spectroscopy...
Interrelation of crystal chemistry parameters, structure and nonlinear optical properties of the niobate and iodate crystals has been established. The combination of chemical bond lengths in these compounds, which is contributed to high optical nonlinearities, is found. This allows to design new promising crystals for optoelectronics.
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