Frictional Strength of Electric Spark Coatings from Powder Wires under Friction without Lubrication

Holubets, V. M.; Pashechko, М. І.; Dzedzic, K.; Borc, J.; Тіsov, Oleksandr

doi:10.3103/s1068366620050128

Cited by 11 publications

(9 citation statements)

References 4 publications

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“…During engine operation, uneven wear of the piston rings occurs due to the different work of friction, specific loads, and energy loading caused by exposure to hot exhaust gases. Hydrogen in the fuel and lubricant contributes to the piston rings' wear due to atomic hydrogen [1][2][3][4][5][6]16].…”

Section: Interaction Of External and Internal Hydrogen In "Cylinder-p...mentioning

confidence: 99%

“…The characteristic cross-sectional size L for bodies can be determined from the parameters of the crystal lattice, taking into account the fact that the piston rings are made of high-strength nodular cast iron (Figure 1) with inclusions of graphite (which belong together with molybdenum disulfides and diselenides, and gallium and indium monoselenides) to the family of 2D layered materials with their unique properties [24][25][26][27][28][29][30][31][32]. On the lattice scale, the distance between graphite layers intercalated by hydrogen (up to 75 ppm and possibly by short-length hydrocarbons) [33] is equal to 0.335 nm, can be taken as the characteristic size of the section, and is the ideal gap (due to low van der Waals interaction between the layers) for the hydrogen intercalation process and the formation of the hydrogen nanocontainer [16]. In the hydrogen-containing (up to 12 ppm) and hydrogenaccumulated (in a nanocontainer) (up to 600 ppm) lubricant-cooling (liquid, solid, gaseous) environment application, hydrogen enters the near crack initiation contact zone before fracture.…”

Section: Interaction Of External and Internal Hydrogen In "Cylinder-p...mentioning

confidence: 99%

“…This process contributes to intensive wear [2][3][4][5][6][7][8][9][10]. Authors [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] have analyzed the features of hydrogen wear of construction machine parts.…”

Section: Introduction State Of the Art And Problem Formulationmentioning

confidence: 99%

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Wear Resistance of Spark Ignition Engine Piston Rings in Hydrogen-Containing Environments

et al. 2021

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We describe the external and internal hydrogen iInteraction on contacting surfaces in the “cylinder–piston rings” friction coupling. Under the influence of high temperatures and pressure, the oil in the combustion chamber at a temperature up to 1473 K decomposes and forms small amounts of water. External hydrogen (H2) is subsequently formed. Hydrogen removal from the piston rings reduces the heterogeneity of the structure, residual stresses, and uneven physical and chemical properties of the near-surface layers, which reduces the stress concentration and, as a consequence, results in an improvement in the performance characteristics of the surface layers of the friction couple “cylinder-piston rings” of the spark ignition engine.

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Section: Interaction Of External and Internal Hydrogen In "Cylinder-p...mentioning

confidence: 99%

Section: Interaction Of External and Internal Hydrogen In "Cylinder-p...mentioning

confidence: 99%

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Wear Resistance of Spark Ignition Engine Piston Rings in Hydrogen-Containing Environments

et al. 2021

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“…are developing quite intensively. Combined methods make it possible to form surface layers with the required mechanical properties and significantly increase the contact strength and wear resistance of components in friction couples [9][10][11][12][13][14][15][16][17][18]. Therefore, it is relevant to determine the effectiveness of improving the wear resistance of heavy-loaded parts in tribomechanical systems by a combined laser-thermochemical treatment method.…”

Section: Introductionmentioning

confidence: 99%

Improving the wear resistance of heavy-duty elements in tribomechanical systems by a combined laser-thermochemical processing method

Киндрачук

Духота

Тіsov

et al. 2021

EEJET

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This paper reports an analysis of the state of tribological support in the aviation industry. The use of surface strengthening technologies to extend the resource of friction node parts has been prioritized. Modern combined technologies of nitriding and laser treatment of steel surfaces have been reviewed. The mechanism has been elucidated that damages steel 30H2NVFA in the jackscrew actuator of transport aircraft flaps, which occurs due to insufficient surface hardness of the material after a generally accepted heat treatment. Auger electron spectroscopy analysis revealed a high concentration of oxygen on the surface: up to 41.4 at. %; the friction surface carbonation has been detected, especially significant at the surface of the pitting damage. A comprehensive technology of surface strengthening by nitriding+laser selective hardening has been suggested. The radiation power was 1 KW, the diameter of the focus spot was 2.5 mm, and the pitch between the focus spot centers was 2.5 mm. The total area of laser processing was 70 %. The steel temperature exceeded Ас3 and corresponded to the hardening temperature range. The depth of the nitrided layer increased to 400 µm, the maximum hardness on the surface was 1,350–1,380 HV0.2. The formation of a solid nitrided layer with a thickness of 200‒250 µm was observed, as well as a transition zone composed of column-shaped iron nitrides, which are introduced into the matrix material. As a result, a sharp gradient in the mechanical properties disappears. The tests confirmed that the wear resistance of the comprehensively treated surface was 2.1 times higher under dry friction conditions, and 4.5 times higher when lubricated with the "Era" grease (RF), compared with the 30H2NVFA steel nitrided by the conventional technology. In addition, there was no fragile destruction of the surface; the interaction with oxygen reduced significantly

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“…Elements of machines and mechanisms operating under significant mechanical loading must have sufficient service life, which is limited mainly by their wear resistance. In order to improve the durability of friction units, it is of scientific and practical interest to study the wear process and wear mechanisms of composite materials, alloys and coatings based on iron, nickel, cobalt and aluminum and which contain carbon, boron, silicon and other elements [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Wear Resistance of Borided Steel C45

2020

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The wear resistance of diffusion coatings in conditions of specific pressures of 3, 7 and 10 MPa was studied. The boride coatings were prepared by means of diffusion methods using C45 steel as the substrate material. Research on the microstructure and redistribution of chemical elements on wear surface of a borided layer was carried out. It was found that the boride coatings should be used under a specific pressure of 7 MPa. It was found that the wear of friction couple coating of steel C45 under specific pressure of 3 MPa proceeds according to the oxidation wear mechanism, while under specific pressures of 7 and 10 MPa the abrasive wear prevails. The wear-induced segregation of atoms in coatings was studied using secondary mass-spectroscopy method (SIMS). Increased C, O, and B concentrations were noticed at the wear surface on depth from 50 to 2000 Å. The secondary wear-induced structure formation on the wear surface resulted in high wear resistance of diffusion borided coatings.

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Frictional Strength of Electric Spark Coatings from Powder Wires under Friction without Lubrication

Cited by 11 publications

References 4 publications

Wear Resistance of Spark Ignition Engine Piston Rings in Hydrogen-Containing Environments

Wear Resistance of Spark Ignition Engine Piston Rings in Hydrogen-Containing Environments

Improving the wear resistance of heavy-duty elements in tribomechanical systems by a combined laser-thermochemical processing method

Analysis of Wear Resistance of Borided Steel C45

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