International Scientific Journal
Published by The V.A.Biely Institute of Mechanics of Metal-Polymer Systems, Gomel, Belarus
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FRICTION AND WEAR (Trenie i Iznos) International Scientific Journal Published by The V.A.Biely Institute of Mechanics of Metal-Polymer Systems, Gomel, Belarus |
Summary: It is established theoretically and validated experimentally that the specific force of friction increases in the environment containing the particles of impurities and contamination as the concentration of the particles grows. It is also established that dielectric permeability of the environment increases similarly as a function of the concentration of particles that leads to a conclusion about correlation between triboengineering characteristics of a system and the permeability of the system.
Zharov I.A.
The allowance for the wheen shape and heat dissipation in calculations of the subsurface temperature in the shoe--wheel--rail system. pp. 477--485
Summary: Correction functions are calculated for the core model allowing for the shape of the wheel and heat dissipation from its surface into the air. Formulas of approximation are proposed for the correction functions and the coefficients of the formulas are determined. The effect of the wheel rim body on the mean temperature of the wheel surface in braking is estimated. A numerical method of calculating the "shoe--wheel--rail" system is proposed.
Lysenok Yu.V., Sergienko V.P., and Balakin V.A.
Thermal calculation of frictional safety clutches of agricultural machinery. pp. 486--490
Summary: Formulas of calculation of mean temperature increments on friction surfaces are shown when frictional safety clutches are activated. Ways are discussed how the hat burden f safety clutches can be relieved by modifying their designs.
Ivasyshin G.S.
The effect of elastic post-effect and additivity of the elastic post-effect on the wear resistance and fretting resistance of flat guides. pp. 491--496
Summary: A formula is derived for distribution of hardness as a function of loading and the elastic post-effect that it initiates. It is proposed to determine the abrasive wear resistance of a material through its elastic post-effect as a variety of the "tribological property of the material". A possibility of controlling wear by suitable designing during elastic post-effects is considered. It is recommended how to control elastic post-effects by improving the design of flat guides.
Belyi A.V., Bilenko E.G., and Kukareko V.A.
The structure and mechanophysical properties of steel 40X13 exposed to ion-beam treatment with nitrogen. pp. 497--502
Summary: It is studied how the low-energy high-current ion beam treatment with nitrogen affects the mechanophysical properties of martensite steel 40X13. The phase composition and distribution of microhardness through the body of the modified layer are determined. The effect of the structure of the hardened layer on the cyclic durability and triboengineering behavior of the steel is analyzed. It is established that compressive stresses appear in the modified layer that boost the endurance limit 1.2 times. It is shown that the wear resistance of the nitrogen-modified steel 40X13 increases ~10 times versus its original condition.
Kazmierczak A.
Antiwear titanium nitride coated piston ring. pp. 503--509
Summary: A new technology of combustion engine piston rings and cylinder sleeve has been developed in this paper. The ring seal has come out as a result of the complex research such as the numerical simulation research, introductory quality research involving a real object, comparative research on a tribotester and fundamental research on the real object; developed in this paper. Having had a specific composition of materials, i.e. the ring with the titanium nitride coating and a cylinder sleeve within the outer layer nitrated in "Nitrovac" technology, the essential variant research began on the real object. The research resulted in the selection of the construction solution of both the piston ring, so called "undercut", and the cylinder sleeve with the nitrated outer layer. In general, it has been found that the free surface energy can be an important index of material selection for cutting pairs, especially for those working in the reciprocating motion.
Basinyuk V.L. and Mardosevich E.I.
Frictional and mechanical properties of oxide ceramic coatings. pp. 510--516
Summary: Results of studies of frictional properties of oxide ceramic coatings are shown when they are produced by anode-cathode microarc treatment during friction contact between them.
Vityaz P.A., Azizov R.O., Belotserkovskii M.A., Kukareko V.A., and Khaitov A.Sh.
The structure and wear resistance of carbonintrated as thermal coatings from wire steels. pp. 517--522
Summary: The structural condition, durometric and triboengineering properties of gas thermal coatings from wire steels Cb-08 and 40X13 have been studied in the original state and after carbonitration. It is established that chemothermal treatment of wire coatings results in diffusive layers 100--200 µm deep with the microhardness 7.0--7.7 GPa. Carbonitration increases the wear resistance of coatings from wire steels Cb-08 and 40X13 correspondingly 25 and 2--3 times versus their original wear resistance.
Markova L.V., Myshkin N.K., Semenyuk M.S., Makarenko V.M., Kolesnikov A.V., Kong H., Han H-G., and Un E-S.
Medthods and means of diagnostics of working properties of a lubricating material. pp. 523--533
Summary: Main indicators of the oil quality and methods of laboratory analysis are evaluated. It is shown that modern requirements to working properties of oils necessitated new methods and means of diagnostics of condition of a lubricating material in the process of operation. Devices of in-process control of performance of lubricating materials are reviewed that use the indicators of viscosity, dielectric permeability, conductance of the oil, its acidic and alkaline number and others. It is shown that devices should be developed sing new technologies and the base of components in order to improve the validity of new devices, to reduce their cost and overall dimensions.
Ermakov S.F., Kupchinov B.I., Pleskachevsky Yu.M., and Shardin V.A.
The effect of temperature in the mesomophic condition on the lubricity of liquid crystals and their blends. pp. 534--540
Summary: The effect of temperature in the mesomorphic condition on the lubricity of cholesteric liquid crystals analyzed. It has been established a practically linear relationship between the temperature of transition of compositions into the liquid crystalline phase and the phase of isotropic liquid is observed among enantiotropic bicomponental blends of liquid crystalline cholesterol compounds within a broad range of concentrations. It is shown that the friction coefficient of individual cholesteric liquid crystals and their blends within the mesophase is temperature dependent and can change by an order of magnitude and has a reversible nature.
Zlotnikov I.I., Ivanova E.M., Smurugov V.A., Biran V.V., and Senatrev N.N.
The mechanism of self-lubrication of polytetrafluorethylene. pp. 541--546
Summary: The results of studies of regularities of formation of transfer films are shown and how the conditions of self-lubrication appear during friction of polytetrafluorethylene and steel. A comparison is made with the regularities observed at the initial stages of friction between graphite and steel. It is shown that during friction under normal conditions the transition of polytetrafluorethylene and graphite to the conditions of self-lubrication and stable friction is due to a stongly different mechanism. The role of temperature is different in these two cases.
Kudina E.F., Kushnerov D.N., Tyurina S.I., and Chmykhova T.G.
The effect of dispersed organosilica particles on the triboengineering contact site of greases. pp. 547--553
Summary: A sol-process served to produce dispersed silica modified with high-molecular additives. A possibility to produce organic silica as an antifriction additive to lubricating oils is studied. It is shown that the structure and the conditions of formation of the introduced hybrid filler govern the triboengineering properties of a lubricating composition.
Sleptsova M.I.
Development of wear resistant sealing materials based on B-14 rubber for polar applications. pp. 554--557
Summary: Wear resistant sealing materials based on B-14 rubber are developed by modifying them with ultra high-molecular polyethylene ad ultradispersed fillers, cobalt spinel and b-sialon. Combined effect of cryogenic temperatures and moisture on the elastic and strength properties have been studied. It is shown that the modified materials are applicable for sealing equipment for polar applications.
Kolubaev A.V., Sizova O.V., Fadin V.V., and Aleutdinova M.I.
Production of antifriction and friction materials from the waste of metal machining. pp. 558--563
Summary: Results of studies of mechanophysical properties of material for antifriction and frictional applications article are shown when they are produced from the powder slam waste of ball bearing production together with their production process.
Matsevityi V.M., Kazak I.B., and Spolnik A.I.
A method of fast tests of materials for wear. pp. 564--567
Summary: A method is described how to test quickly wear resistant materials in order to determine their triboengineering characteristics. The proposed method is recommended for designing friction units using new wear resistant coatings.
Barinov S.V., Zagorodskikh B.P., and Simdyankin A.A.
A study of the wear resistance of parts with a non-homogenous friction surface. pp. 568--572
Summary: The results of studies of the wear resistance of blocks with non-homogenous mechanophysical properties of friction surfaces are shown. The optimum angles of slope of groves filled with a wear resistant material are determined, the moments of friction and the temperature of oil in the process of running-in of the "block--roller" couple are measured.
Tolstoy A.V. and Pushkin S.O.
The technological aspects of restoration of performance and improvement of durability of gear pumps with external toothing. pp. 573--577
Summary: Based on the evaluation of the degree and pattern of wear of working surfaces of delivering and dosing pumps with external toothing some technological techniques are proposed how to restore their performance so that it becomes possible to perform 3-4 repairs and to restore their technical characteristics fully in accordance with the manufacturers' specifications of the pumps. It is proposed how to modify the design based on the hydraulic unloading of friction units to be able to improve the wear resistance of bearing units of the delivery pumps 6--7 times compared with mass-produced pumps.
REVIEWS. pp. 578--579
CHRONICLE. p. 580
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