Improvement of performance of machine parts by electrocontact welding of composite materials

Saifullin, R.N.

doi:10.3103/s1068366607020122

Cited by 5 publications

(8 citation statements)

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“…The mathematical model of electric contact surfacing of "shaft" type parts is developed on the basis of the numerical recurrence solution of the finite-difference form of static equilibrium conditions of selected elementary volumes [15][16][17][18]. The plastic deformation zone 1 1 2 2 is divided on the finite set of elementary volumes ( Figure 1).…”

Section: Theoretical Studiesmentioning

confidence: 99%

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Investigation of Thermostressed State of Coating Formation at Electric Contact Surfacing of “Shaft” Type Parts

Berezshnaya

Gribkov

Kuznetsov

2016

Advances in Materials Science and Engineering

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The forming of coating at electric contact surfacing is considered. The mathematical model of the coating formation is developed. The method of numerical recurrent solution of the finite-difference form of static equilibrium conditions of the selected elementary volume of coating is used. This model considers distribution of thermal properties and geometric parameters along the thermal deformation zone during the process of electric contact surfacing by compact material. It is found that the change of value of speed asymmetry factor leads to increasing of the friction coefficient in zone of surfacing. This provides the forming of the coating of higher quality. The limitation of the technological capabilities of equipment for electric contact surfacing is related to the size of recoverable parts and application of high electromechanical powers. The regulation of the speed asymmetry factor allows for expanding the technological capabilities of equipment for electric contact surfacing. The nomograms for determination of the stress on the roller electrode and the finite thickness of the coating as the function of the initial thickness of the compact material and the deformation degree are shown.

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Section: Theoretical Studiesmentioning

confidence: 99%

“…where and are constants, defined from boundary conditions (15) and (16). According to symmetry condition (15),…”

Section: Theoretical Studiesmentioning

confidence: 99%

Investigation of Thermostressed State of Coating Formation at Electric Contact Surfacing of “Shaft” Type Parts

Berezshnaya

Gribkov

Kuznetsov

2016

Advances in Materials Science and Engineering

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“…Investigations have shown (Fig. 8) that a powder coating with 10 % tin in its composition has the minimum wear, and a coating containing tin (5 %) and copper (5 %) has the maximum wear [29].…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, it is known from the powder metallurgy that the powder body is unstable because of abundant free energy. This is primarily caused by the presence of an extremely advanced internal phase interface between the solid body and pores [27][28][29][30][31]. Besides, the problems of wear resistance when using the fillers of powder compositions are underexplored, which allow to control the structure and physical mechanical properties of deposited reconditioning and / or hardening coating [24,[32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Coatings Obtained with Electrocontact Welding of Metal Powder Materials

Saifullin¹,

Islamov²,

Kuznetsov³

et al. 2020

Tribol. Ind.

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The investigations of tribo mechanical properties of coatings obtained with electrocontact welding of sintered powder materials and powderpolymer fillers of Russian manufacture are presented. It is proved that the introduction of antifriction components (powders of copper or tin) into filler material at a rate of 5-10 % increases the time to joints seizure by 1.5-2 and decreases by 1.5 the friction ratio. The application of powderpolymer and sintered fillers reinforced with metal grid produces a relief on the operating surface of the coating with the areas possessing minimum hardness. They are worn out more intensely and the forming herewith grooves help to keep lubricating oil on the friction surface. For the friction pair operating in abrasive wear conditions with adhesive wear elements, at welding it is recommended to use powder compositions (by weight): 80-90 % -PG-FBX6-2, 10-20 % of copper powder friction ratio

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“…Dissolution of powders in electrolyte solutions leads to deterioration of the electrolysis conditions which imposes significant process limitation on the use of each specific material for the CEP obtaining [4, 5, 7]. Analysis of available data shows [8] that a number of studies in which no dissolution of hardening phases (borides) were taken into account contain inaccuracies, and the neglecting of this fact by the author of [6] led to excessively wide advertising of dispersion hardening processes realized in chroming electrolytes containing zirconium diboride.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of Nanopowders of Borides and Carbides of IV–VIB Group Metals in the Nickeling Electrolytes

Shakhnin¹,

Малышев²,

Kuschevskaya³

et al. 2017

Nanoscale Res Lett

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The corrosion resistance of nanopowders of borides and carbides of metals of IV–VIB groups, as well as of silicon carbide, was studied in the standard nickeling electrolytes. As objects of study, nanopowders with the content of the main phase 91.8–97.6% and with the average particle size 32–78 nm were used. Their corrosion resistance was evaluated depending on the acidity of the electrolyte, temperature, and duration of the interaction. It was found that, by the corrosion resistance in the electrolytes solutions, nanopowders of borides and carbides within each group of compounds are similar and characterized by unlimited period of induction in alkaline media. An exception is the nanopowder of silicon carbide which is resistant to the solution of any acidity.

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Improvement of performance of machine parts by electrocontact welding of composite materials

Cited by 5 publications

References 0 publications

Investigation of Thermostressed State of Coating Formation at Electric Contact Surfacing of “Shaft” Type Parts

Investigation of Thermostressed State of Coating Formation at Electric Contact Surfacing of “Shaft” Type Parts

Tribological Properties of Coatings Obtained with Electrocontact Welding of Metal Powder Materials

Corrosion Resistance of Nanopowders of Borides and Carbides of IV–VIB Group Metals in the Nickeling Electrolytes

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