Recycling of Ferrous Metal Shavings

Ровин, С. Л.; Ровин, Л. Е.; Zayac, T. M.; Valickaya, O. M.

doi:10.21122/1683-6065-2017-4-94-101

Cited by 3 publications

(5 citation statements)

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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%

“…These operating conditions lead to the thermomechanical destruction of fuel and oil combustion products by forming free (external) hydrogen and its subsequent adsorption by the rubbing surfaces. The periodic occurrence of alternating stress waves (tension-compression) enhances the saturation of near-surface metal volumes by hydrogen during friction and cavitation [1][2][3][4][5][6][7], and these phenomena using experimental equipment [1,2].…”

Section: Introduction State Of the Art And Problem Formulationmentioning

confidence: 99%

“…The obtained results show that the piston rings of D-50, D-240, ZMZ-24, CC-10UD, and other engines are mainly subjected to both technological and operational hydrogen saturation, causing their embrittlement. 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%

“…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%

“…It is noted that the driving forces in the processes of hydrogen wear are temperature, pressure, deformation, structure, and crystal lattice defects. The physical and mechanical processes on the friction surface of the hydrogen wear of machine and equipment parts are investigated, and the reasons for the release of hydrogen-hydrogen absorption by rubbing surfaces and their destruction have been established [6][7][8][9][10].…”

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: Introduction State Of the Art And Problem Formulationmentioning

confidence: 99%

Section: Introduction State Of the Art And Problem Formulationmentioning

confidence: 99%

Section: Introduction State Of the Art And Problem Formulationmentioning

confidence: 99%

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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The impact of impurities on the Al–Fe–C system phase composition changes during sintering

Korosteleva,

Knyazeva,

Anisimova

et al. 2023

Izv. VUZ. Poroshk. Met.

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Manufacturing waste can be not only recycled but also utilized as a source of chemical elements and as a component of powder materials. Steel swarf are a complex multicomponent material with a high iron content, while impurities such as carbon can affect the diffusion interaction in the chip and metal powder mixture. In this study, we investigate the diffusion interaction between aluminum and steel swarf using temperature-controlled vacuum sintering. We analyzed the resulting mixture’s microstructure and phase composition, and observed that sintering creates a multiphase structure in which FeAl iron aluminide occupies at least 30 vol. %. Despite the high sintering temperature, we also observed residual aluminum and iron. Incomplete transformation may result form refractory products that inhibit diffusion or impurities that influence the magnitude and direction of the diffusion fluxes. To confirm the impurities’ role in the diffusion interaction kinetics, we developed simulation models of the intermetallic phase growth for a flat and spherical particle embedded in aluminum. The model consider cross-diffusion fluxes in the emerging phase regions and possible effects of impurities on the concentration limit for the new phase’s existence. We derived approximate analytical solutions to analyze the emerging phase growth trends under various model parameters.

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Technology of flame‑induction heating of ferrous metal shavings in hot briquetting installations

Dyakonov,

Sereda

2024

Litʹë metall.

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As a result of the study of flame‑induction heating of steel and cast iron shavings, optimal heating modes, dimensions of the furnace and the ratio of the sizes of its components (gas‑flame and induction heaters) were established, which served as the basis for the development of a new heating technology, which ensures minimization of dimensions in comparison with known analogues, increasing the productivity and efficiency of the furnace. It has been established that at the stage of evaporation and removal of water vapor and light oil fractions from the chips in the temperature range of 100–550 °C until the optimal oil concentration of 1.5–3.0 % is achieved, among all known methods of muffle heating, gas‑flame heating is the most economical and productive heating, and subsequently, when heating a dehydrated porous mass of metal with a density of 1100–1700 kg/m3 to 850 °C – induction heating in an atmosphere of products of thermal sublimation and destruction of coolant. It is advisable to carry out induction heating with a current frequency of 2.0–2.4 kHz with a ratio of the lengths of the gas‑flame and induction heating zones of 2.0–2.5 and the dimensions of the inductor (height to hole diameter) of 3.7–4.0. The degree of oxidation of hot‑pressed briquettes corresponds to the initial oxygen content in the chips: for steel – 1.3–1.7 %, for cast iron – 0.46–0.47 %. The data obtained made it possible to develop a technology for flame‑induction heating of ferrous metal shavings, as well as the design of a small‑sized furnace with a specific productivity of 6500–9500 kg/m2·h and an efficiency of 40–45 %.

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Recycling of Ferrous Metal Shavings

Cited by 3 publications

References 0 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

The impact of impurities on the Al–Fe–C system phase composition changes during sintering

Technology of flame‑induction heating of ferrous metal shavings in hot briquetting installations

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