A study of the structure and properties of material based on an iron – copper composite powder

Minitsky, A. V.; Byba, Ievgen; Minitska, Nataliya; Radchuk, S. V.

doi:10.15587/1729-4061.2019.164017

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…Carbon fibres were previously coated with Ni by chemical deposition (reducing nickel chloride with hypophosphite in an aqueous solution). This method is relatively inexpensive and does not require special expensive equipment, while it allows obtaining high-quality coatings from various materials with high adhesion between the substrate and the coating [10].…”

Section: Experimental Techniques and Resultsmentioning

confidence: 99%

Effect of Plating of Carbon Fibres with Ni on Properties of Fe-Based Materials

2022

Nanosistemi, Nanomateriali, Nanotehnologii

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The structure and properties of the material based on carbonyl iron reinforced with carbon fibres, which are previously plated with nickel, are studied. Uncoated carbon fibres are used for the first group of samples, and nickel-plated carbon fibres are used for the second group. Nickel plating is found to provide better adhesive interaction between carbon fibres and iron. As shown, the reinforcement with nickel-plated carbon fibres allows increasing both the strength limit and the plasticity of materials. At the same time, for samples sintered at 900C, the strength does not increase fundamentally (from 661 MPa to 697 MPa), but the relative elongation doubles from 22.7% to 45.1%. Using the method of fractographic analysis, the viscous nature of the destruction of the samples is established, and it is shown that the microrelief of the surface is characterized by oblique fractures, which is due to the formation of viscous dimples under the action of tangential stresses. An increase in the sintering temperature to 1000C provides an increase in the compressive strength of the samples to 1002-1185 MPa, while the samples containing clad fibres have strength of 180-185 MPa higher than the strength of samples with carbon fibres not plated with nickel.У роботі досліджено формування структури та властивості матеріялу на основі карбонільного заліза, армованого вуглецевими волокнами, попередньо плакованими ніклем. Для першої партії зразків було застосовано неплаковані вуглецеві волокна, а для другої -вуглецеві волокна, плаковані ніклем. Встановлено, що плакування ніклем забезпечує кращу адгезійну взаємодію між вуглецевими волокнами та залізом. Показано, що армування вуглецевими волокнами, плакованими нік-

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Section: Experimental Techniques and Resultsmentioning

confidence: 99%

Effect of Plating of Carbon Fibres with Ni on Properties of Fe-Based Materials

2022

Nanosistemi, Nanomateriali, Nanotehnologii

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“…For example, commercially pure Cu featuring exceptional electric conductivity is advantageously applied in conductors [2,3]; Cu-based alloys and compounds are primarily used for their high resistance to corrosion in multiple solutions [4]; and modern Cu composites, which can be advantageously combined with polymers or other elements and alloys, provide a combination of light weight and reasonable strength and conductivity (e.g., styrene-ethylene/butylene-styrene, aluminium, iron, etc. [5][6][7][8][9][10][11][12]).…”

Section: Introductionmentioning

confidence: 99%

Structural Factors Inducing Cracking of Brass Fittings

et al. 2021

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Cu–Zn–Pb brasses are popular materials, from which numerous industrially and commercially used components are fabricated. These alloys are typically subjected to multiple-step processing—involving casting, extrusion, hot forming, and machining—which can introduce various defects to the final product. The present study focuses on the detailed characterization of the structure of a brass fitting—i.e., a pre-shaped medical gas valve, produced by hot die forging—and attempts to assess the factors beyond local cracking occurring during processing. The analyses involved characterization of plastic flow via optical microscopy, and investigations of the phenomena in the vicinity of the crack, for which we used scanning and transmission electron microscopy. Numerical simulation was implemented not only to characterize the plastic flow more in detail, but primarily to investigate the probability of the occurrence of cracking based on the presence of stress. Last, but not least, microhardness in specific locations of the fitting were examined. The results reveal that the cracking occurring in the location with the highest probability of the occurrence of defects was most likely induced by differences in the chemical composition; the location the crack in which developed exhibited local changes not only in chemical composition—which manifested as the presence of brittle precipitates—but also in beta phase depletion. Moreover, as a result of the presence of oxidic precipitates and the hard and brittle alpha phase, the vicinity of the crack exhibited an increase in microhardness, which contributed to local brittleness.

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Analysis of the compaction process of copper clad tungsten powders

Polishchuk,

Minitskyi

2024

Metalozn. obrobka met.

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The paper analyzes the pressing process of a composite powder of the tungsten-copper system using the basic mathematical equations describing the deformation processes of a porous body as a function of density and pressing pressure. Several theoretical dependences describing different pressing mechanisms are considered, taking into account modern approaches, namely the discrete-contact model and the continuum model of a continuous medium. The most well-known equations, including those of Balshin M.Y., Zhdanovich G.M., and Shtern M.B., are analyzed. It is established that most of them have limited applicability, remaining valid for individual stages of the pressing process and significantly depend on the mechanical properties of the material that determine the predominance of elastic or plastic deformation. At the same time, most equations are focused on single-component powders, which does not correspond to the practice of powdered parts production processes. To test the theoretical dependencies, copper-clad tungsten powder was obtained by chemical vapor deposition from solution. The technological parameters of the cladding process (composition, solution concentration, and deposition time) that determine the quality of the resulting coatings were determined. The morphology of the particles of clad powders and the structure of tungsten-copper pressings were investigated. It is shown that tungsten powder forms a relatively dense framework with a copper layer, respectively, the structure of composite powder pressings is as close as possible to a continuous continuum and is correctly described by an equation based on the theory of continuity of the medium, It has been established that the compaction character of copper-clad tungsten powder differs from that of single-component tungsten powder, which is due to the fact that plastic deformation mechanisms prevail for tungsten-copper composite powders.

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A study of the structure and properties of material based on an iron – copper composite powder

Cited by 3 publications

References 9 publications

Effect of Plating of Carbon Fibres with Ni on Properties of Fe-Based Materials

Effect of Plating of Carbon Fibres with Ni on Properties of Fe-Based Materials

Structural Factors Inducing Cracking of Brass Fittings

Analysis of the compaction process of copper clad tungsten powders

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