It is found that a sufficiently high catalytic activity of the metal oxide electrode is due to the state of phase disordering of the coating surface due to the presence of highly dispersed spinel-like and rutile-like phases of solid solutions, as well as the nature of the distribution of these phases in the coating volume. The possibility of formation of disordered and partially ordered spinel-like phases of the form (Co,Mn)3-xO4 is analyzed
Keywords: structural-phase disorder, solid solutions, spinalator phase retinopathy phase coating
This article presents the results of studies on the effect of the erbium chelate complex on the processing of secondary raw materials from polyethylene terephthalate (PET).
Keywords: polyethylene terephthalate, recycling, extrusion, polyisobutylene, chelate complex of erbium.
The article examines the effect of polytitanate potassium intercalated copper on the structure and physico-mechanical properties of composite materials containing as a filler. Matrix composite material is a mixture of polyethylene 277 and copper-polymer complex of polyacrylamide. It is shown that the pre-intercalation of polytitanate potassium copper improve of physico-mechanical properties of the composite material.
Keywords: intercalated, polytitanate potassium, polyethylene, copper-polymer complex of polyacrylamide, friction coefficient, wear resistance, structure, hardness, elemental composition
Effect of water-soluble polymers additive and surface treatment on particle size distribution are shown in this article.
Keywords: electrolytic copper powder, water-soluble polymer, polyvinylpyrrolidone, polyacrilamide, electropolishing, atomic force microscopy
The article presents a comparative analysis of nanopowders of copper obtained by electrolysis with the use of the stabilizer polyvinylpyrrolidone (PVP). It is established that the properties of powders of copper determines PVP polymer film formed on the surface of nanoparticles
Keywords: Nanopowders of copper, stabilization of particles, granulometric composition, differential thermal analysis, water-soluble polymer
The effect of two surface-active substances (SAS) - polyvinylpyrrolidone (PVP) and polyacrilamide (PAA) on formation kinetics of anodic synthesized electrolytes for copper powders production was reviewed, as well as product properties. It was found that the copper powder properties defined by polymer film of PVP and PAA formed on cathode surface. Nanosized particles percentage increasing by dints of copper ions direct discharge from ammonia complex ions provided by polymer film. In the electrolyte containing PAA is possible to obtain copper powder with nanosized (less 100 nm) particles content of 50,2%, average size in nanosized range is 43nm with needle-dendrite particle shape
Keywords: electrolytic copper powder, vibrating cathode, polarization curve, chronopotentiometry, potential dip after current tripping, particle size distribution, water soluble polymer, nanosized particle, ammonia chloride, polyvinylpyrrolidone, polyacrilamide, am
In this article methods of copper ultrafine powders stabilization from agglomeration and aggregation by water soluble polymer in process of production by electrolysis on vibrating cathode, as well as their effect on physical and mechanical properties of polymer composites.
Keywords: ultrafine powders, stabilization, friction coefficient, wear, structure of composite materials
Regularities of copper's Nano powders receiving by an electrolysis method in ammine electrolyte, with the soluble copper anode and the corrugated titanic cathode are investigated. With additional use of polyacrylamide as the stabilizer of particles' growth of Nano powder of polyacrylamide. It is shown that in the polyacrylamide's presence the share of Nano dimensional fraction of copper's powder raises and the contents in the final product of copper`s oxides decreases. To what Nano powders' roentgenograms testify.
Keywords: copper's Nano powder, electrolysis, part of electrolyte, phase structure
In persisting article is offered structure and functional composition of the programme modules of the tools of the analysis dynamic mechanical systems of the class tooth issues. In change from existing, proposed programme complex contains the extended composition of the modules. This enables, in particular, check convergence iteration computing processes, way to visualizations of the current importance of the full kinetic energy of the fluctuations of the under investigation mechanical system. The broughted composition each of block of the programme complex, with detailed description of the purpose included modules into them.
Keywords: The mechanical system, tooth issue, modeling, programme complex, dynamic of the system
Is presented the solution of important sectoral issues to improve traffic safety of rolling stock by reducing lateral wear of wheels and rails heads when changes trucks in curves parts of the route by increasing reliability and durability of the pivot site.
To resolve this task, the paper proposed to the original design decision metered supply of lubricant to the friction surfaces of the parts with wear and tear their contact surfaces. According to the proposed resolution on friction surfaces pivot site are hollow, filled with solid composite lubricant, which in process of deterioration will portions get in contact area.
Theoretical foundations and the equation of adaptive management is present.
Keywords: center plate, adaptive regulator, operating parameters, lubricating layer, wear
The ability to choose the right anti-wear additives [1-6 ] allows you to create lubricants , which are thin layers have different properties than in large volumes. It is commonly assumed that the additives are functioning only in the zone boundary lubrication and are outside the scope of the hydrodynamic theory of lubrication . However, the beneficial effect of additives as indicated in many studies [1-5 ] we have in the " thin layer" of hydrodynamic lubrication .As is well known , lubrication bearings operate on different types of lubricants which are composed of base oil and additive compositions that provide the required functional properties of the oil . Additives polymers with high molecular weight oils impart viscoelastic properties . Analysis of existing studies [ 7-9] on the calculation of bearings running on a viscoelastic lubricant , shows that they do not take into account the dependence of the viscosity and shear modulus of the pressure and temperature, and mode of friction is assumed laminar. It is known [ 10 ] , high-speed bearings operating in turbulent friction , higher pressure and higher temperature, and so the development of methods for calculating the bearings running on a viscoelastic lubricant requires consideration of the above factors.In connection with the above written shall first develop the computational model of thrust bearings running on micropolar lubricant with the viscosity characteristics of the lubricant on the pressure in contrast to the existing theoretical models do not take into account these dependencies (task 1).And then consider the calculation model of extra load -bearing capacity , working on a viscoelastic lubricant for the dependence of its characteristics on the pressure (objective 2).
Keywords: thrust bearing with the abutment surface adapted, non-Newtonian lubricants
In this work experimentally investigated the possibilities of the new method of obtaining adjustable roughness on metal surfaces electrothermal influence of mobile cathode spots in vacuum arc discharge. Presents the results of processing of various surfaces using this method. Proposed working modes of processing of metal surfaces with the aim to receive as minimum and maximum roughness.
Keywords: roughness of metal surfaces, vacuum arc discharge, cathodic spots
To investigate the stability of the porous bearings developed computational model heterogeneous porous bearing of finite length. Given the permeability anisotropy of the porous layer in the paper the problem of stability of motion of a pin in the bearing for the two different versions of lubrication: the axial direction and in the direction perpendicular to the axis of the bearing. Obtained and analyzed the tasks identified areas of stability of motion spine.
Keywords: porous bearing, friction regime, the permeability of the porous layer, the viscoelastic lubricant.
"The mechanical properties of the rubber-cord composite in strengh analysis are described. There is an algorithm of the numerical estimation of the effective (average) properties of the rubber-cord. The effective properties are defined by the successive application of different deformations to the representative volume of the rubber-cord composite (tensions along each coordinate axis and shifts in each cooridinate planes). The effective properties are defined in form of the generalized Hooke's law (for anisotropic materials). A serias of computations in estimatition of the effective properties of double-layer rubber-cord composite was carried out based on the proposed algorithm. The dependence of the effective elastic modules of rubber-cord on the angle of cord was explored. The according graphs are represented in the article."
Keywords: theory of elasticity, effective properties, strength analysis, rubber-cord, numerical modeling, finite element method, CAE FIDESYS
The article presents the new technologies and design tools for опиливания of machine parts. A number of new technical solutions in the field of innovative Metalworking tool for опиливания parts of machines, with a complex of technical and economic advantages over existing analogues. Shows the five variants of constructions and technologies for the production of files and надфилей, based on the use of hard coating. New tools are characterized by a low-cost, low labour-intensiveness of manufacturing and high performance.
Keywords: tribology, the filing of a painful, spraying, carbide coatings, wear, self-sharpening, reversible cutting plates