Ìåæäóíàðîäíûé íàó÷íûé æóðíàë
Èçäàòåëü: Èíñòèòóò ìåõàíèêè ìåòàëëîïîëèìåðíûõ ñèñòåì èì. Â.À. Áåëîãî ÍÀÍ Áåëàðóñè, Ãîìåëü, Áåëàðóñü
|
ÒÐÅÍÈÅ È ÈÇÍÎÑ Ìåæäóíàðîäíûé íàó÷íûé æóðíàë Èçäàòåëü: Èíñòèòóò ìåõàíèêè ìåòàëëîïîëèìåðíûõ ñèñòåì èì. Â.À. Áåëîãî ÍÀÍ Áåëàðóñè, Ãîìåëü, Áåëàðóñü |
Davis J. A., Wilbur P. J.
Boron ion implantation for tribological applications. pp. 722--729
Summary: Boron implantation at an elevated temperature is proposed as an attractive alternative to conventional diffusion processing (bonding). It is shown that independent, precise control of implantation current density and temperature enables production of the preferred Fe2B phase and elimination of the brittle FeB phase in thick layers on pure a-Fe. An implantation temperature near 750 °C is preferred. Iron discs implanted with B wear much more slowly than ones implanted with N under corresponding conditions and slightly more slowly than ones implanted with an order of magnitude more N. Implantation of quenched and tempered M2 steel as temperature below 800 °C yields layers that are harder but less wear resistant than the untreated steel. A boron implantation temperature over 900 °C induces austenitization of M2 tool steel and in vacuo cooling from this state can produce a thick: Fe23B6-rich layer on a hard martensitic base. Implantation above this temperature should enable simultaneous bulk heat treatment and creation of a wear-resistant surface layer on the mill-annealed steel.
Kleis I., Pappel T., Hussainova I., Shcheglov I.
Investigation of particle impact process. pp. 730--735
Summary: Interaction of glass spheres and irregular shape panicles with plane targets of different materials was studied experimentally, using a special Laser Doppler Anemometer (LDA) and the corresponding measuring technique. The mathematical models expressing the coefficient of restitution was analyzed. Total and residual indentation depth and the normal force component applied to target material surface, maximum pressure on target material, the radius of the impact crater and radial stresses were calculated.
Pogosyan A. K., Arustamyan Yu. S., Gevorkyan G. R., Saroyan W. V.
New chlorine-phosphorus-containing compositions as additives. pp. 736--738
Summary: Two new compositions belonging to the class of chlorine-containing ethers of phosphor acid are suggested as highly effective additives. The action mechanism of additives is described.
Sheludko E. V., Kovtun G. A., Tsypina O. N., Nesterov A. V.
Fluorocontaining solid lubricating coatings. pp. 739--743
Summary: The properties of fluorocontaining polyamide modified by epoxide oligomer are investigated. The compatibility of the components, their proportions in the compositions, the time and the temperature of solidification, thermomechanical and tribological features have been investigated. The composition have been created lo produce solid lubricating coatings (SLC) with the solidification temperature from 80 to 180 °C. The data of tests of the SLC as internal coating of pneumatic cylinders of industrial robots are demostrated.
Burya A. I., Il'yushenok V. V., Nachovnyi I. I., Okhotnikov E. I., Kholodilov O. V., Pankina O. P.
Study of stuffing box packing from chemical fibers. pp. 744--749
Summary: Experimental results on thermophysical and tribological behaviour of stuffing box packing from polyoxadiazole and polyvinylchloride fibers, both original and impregnated with machine oil and polytetrafluoroethylene are presented.
Kovalev V. D.
Calculation algorithm and study of fluid film bearings. pp. 750--760
Summary: The present paper deals with calculation procedure and study of fluid film bearings used in machine building. This approach is independent of bearings' type, like hydrostatic, hybrid or hydrodynamic ones. Results of the study is compared with data of other authors.
Kulkov S. N.
Fractal approach in tribology. pp. 761--765
Summary: The fractal theory is applied to analysis of metallic surfaces subjected to abrasive wear. It is shown that the worn surfaces can be described by both fractal and multifractal model. The fractal and multifractal dimensions differ essentially from integer. The latter is effected by scale level on which the study is conducted.
Yevtushenko A. A., Ivanyk E. G.
On the determination of the maximal temperature of frictional clutches and brakes. pp. 766--771
Summary: A mathematical model for determination of the maximum contact temperature during braking is proposed. The solution is found of the axis-symmetric nonstationary heat-conduction problem for the half-space heated in the circle region on the surface by the frictional heat flow. The obtained result is compared with the corresponding results for the plate with one surface heated due to heat flow and second one thermoinsulated.
Starostin N. P., Kondakov A. S., Morov V. A.
Analysis of transient thermal contact in cylindrical sliding bearings with thin coating. pp. 772--782
Summary: Based on the early modified model of the Winkler thermoelastic foundation, an algorithm is developed for solving a transient thermal contact problem. The solution makes possible a prompt choice of best tribological parameters for successful operation of sliding bearings. A transcendental equation is derived for determining the contact area. The thermal model as a superposition of one- and two-dimensional constituents is proposed for calculating the transient temperature field in the sliding bearing. Solution of a model problem is analyzed.
Voyachek I. I.
Contact of components assembled with interference fit. pp. 783--789
Summary: Contact formation is examined of components assembled with interference fit. A technique is proposed to calculate the real contact area and friction force with consideration for quality parameters of mating surfaces. The parameters arc demonstrated to effect the connection performance. The calculation is supported by experimental results.
Kolubaev A. V., Fadin V. V., Panin V. E.
Friction and wear of composite materials with multilevel damping structures. pp. 790--797
Summary: The accomplished studies have revealed the mechanical and tribological behavior of composite heterogeneous materials containing titanium carbide as a solid phase. It is demonstrated that wear becomes controllable by engineering a multilevel damping structure and by achieving the structural level of deformation of the surface layer most suitable for given friction conditions.
Kulkov S. N., Savchenko N. L., Tarasov S. Yu., Melnikov A. G.
Tribotechnical properties of Y-TZP in ceramic--steel couple. pp. 798--804
Summary: The wear characteristics of an yttria-stabilized zirconia (Y-TZP) are represented by set of three-dimensional wear maps. Sliding tests were conducted, in air, of Y-TZP ceramic pins prepared according to different methods against steel disc. Different wear regions were identified as a function of applied stress and sliding speed. Sudden increases in wear, identified as wear transitions, were found at certain stresses and speeds. Below the wear transitions, the wear was mild and the wear mechanism was predominantly plastic deformation and microfracture. Above the wear transitions, the wear was severe, dominated by brittle fracture. Under high speed, transfer film on ceramic pins provides protection against wear.
Kovalchenko A. M.
Effect of nitride ceramics grain size and size of fixed diamond particles on abrasive wear. pp. 805--811
Summary: Materials studied were ceramics of the system Si3N4 -- 5% (Al2O3 + Y2O3) -- TiN with TiN content from 0 to 80% and Si3N4 -- (Al2O3 + Y2O3) with content s (Al2O3 + Y2O3) from 5 to 60%. Tribotests were conducted on specially designed apparatus including longitudinally travelling loading device which presses a ceramic specimen to a rotating diamond-bearing shaft. Tribotests discovered a correlation between ceramics strength and wear resistance. A ratio of volumetric wear of ceramics during friction against shaft with bigger diamonds to volumetric wear during friction against shaft with smaller diamonds is significant. Given ratio decreases with increasing average ceramic grain size and it is approximately equal to 4 when ceramics has 0.25 µm average grain size, while this ratio is from 1 to 2.5 with the biggest studied ceramic grain size. Practical recommendations for diamond wheels choice for machining of ceramics with different grain size could be elaborated on the base of results obtained.
Sizova O. V., Seifullina T. Z.
Abrasive wear of carbide steels an hard coatings. pp. 812--817
Summary: The effect of abrasive medium on the mechanism of surface layers wear has been considered for high-alloy steel and for various hardfacing techniques of medium-carbon steel. It has been shown that combined wear mechanisms occur according to the structure and surface layer properties of steel.
Popov V. L., Kolubaev A. V.
Analysis of the mechanisms of formation of surface layers in friction. pp. 818--826
Summary: The problem is investigated what causes the localization of deformation and temperature, the nature of evolution of a surface layer in friction when its thickness is fundamentally essential for controlling the process of friction and wear. It is demonstrated that this phenomenon is caused by dynamic effects due to stochastic interactions between surface microirregularities or due to adhesion governing the scale level of deformation and failure processes.
Vereshchagin M. N., Goranskii G. G.
Aspects of structure transformation of wear-resistant ferrous amorphous coatings. pp. 827--831
Summary: The influence of high-rate quenching regimes of ferrous amorphous coatings on their structure, phase composition, adhesion strength and wear resistance has been investigated. It was shown that wear resistance of Fe--Cr--B--Si based coatings can be increased up to 1.6--1.8 times due to amorphization.
Krasnov A. P., Vinogradova O. V., Bazhenova V. B., Makarova T. N.
Studies of mixtures of poly(phenylenesulfide)-polytetrafluoroethylene. pp. 832--838
Summary: The active part is shown of polytetrafluoroethylene in acceleration of degradation-structurization transformation in poly(phenylenesulfide). Materials on the base of mixtures of polymers are more wear-resistant at 250 °C than the materials on the base of poly(phenylenesulfide) or polytetrafluoroethylene.
Kharlamov V. V., Lokshin B. E., Permyakova T. A., Sheveleva Ye. N., Pavlyshko S. V., Pozdeev A. I.
Studies in antifriction and technological properties of Fecon and lubricant-coolants. pp. 839--843
Summary: Tribological, physical-chemical, and bactericidal properties are studied of Fecon, pigsty waste used for lubricant-coolants production.
Obituary for Edward V. Ryzhov. p. 849
Contents of volume 18 (January--December 1997). pp. 850--853
Authors index of volume 18, No 1--6. p. 854