Antifriction Nanocomposite Coatings that Contain Magnesium Carbide

Babak, Vitalii; Щепетов, В. В.; Harchenko, S. D.

doi:10.3103/s1068366619060035

Cited by 29 publications

(12 citation statements)

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“…In the study of the microstructure of samples with plasma-diffusion coating after testing, it was found that cracks in the coating arise in the process of creep mostly at the interface between the plasma and diffusion layers of the coating [47][48][49][50][51]. Penetration of atmospheric oxygen occurs through a crack that has reached in its development of the coating surface, and causes the predominant oxidation of the diffusion silicide layer.…”

Section: Methodsmentioning

confidence: 99%

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Heat protective coatings on niobium alloys

Babak

Lyashenko

Щепетов

et al. 2020

Mechanics and Advanced Technologies

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The article shows that during plasma-diffusion deposition, a multilayer coating was formed on the surface of the niobium alloy. A highly porous plasma-sprayed layer of molybdenum silicide has a significant spread in thickness (h=100...350 μm, Hμ20=6880 MPa). When studying the microstructure of samples with a plasma-diffusion coating after testing, it was found that cracks in the coating originate in the process of creep, mostly at the interface between the plasma and diffusion layers of the coating. The source of their origin is individual discontinuities in the diffusion layer as delivered. Crack propagation occurs both into the plasma and diffusion layers of the coating. Crack growth in the plasma layer is inhibited due to the rounded nature of the pores and the increased plasticity of this layer. The growth of cracks deep into the sample is, as a rule, inhibited by a boride sublayer. The advantage of plasma-diffusion technology provided an increased plasticity of the coating, the presence of thin barrier sublayers, a discontinuous coating structure, the presence of low-melting compounds that contribute to the healing of defects in the coating, an increase in its corrosion resistance and resistance to thermal fatigue destruction. The combination of these properties made it possible to provide an increase in durability compared to silicide and borosilicide coatings under conditions of isothermal creep in air (1400 °C, 50 MPa) 1.9...3.7 times and under conditions of thermal cyclic creep (1400-250 °C, 50 MPa) in 6.8...8.5 times. It has been determined that the use of a discrete structure will increase the thickness of the coating layer and ensure an increase in their working properties.

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Section: Methodsmentioning

confidence: 99%

“…Thus, almost always this effect is manifested at low load levels (Fig. 1, c) and, most often, is absent at voltages above 50 MPa [47][48][49][50][51].…”

Section: Methodsmentioning

confidence: 99%

Heat protective coatings on niobium alloys

Babak

Lyashenko

Щепетов

et al. 2020

Mechanics and Advanced Technologies

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“…The development of antifriction nanostructured glasscomposite self-lubricating coatings meets the modern priorities of tribotechnical materials science aimed at increasing the wear resistance of friction-loaded movable interfaces and, on their basis, the development of scientific and applied solutions in the interests of improving the efficiency of using high-quality production technologies [5,6].…”

Section: Introductionmentioning

confidence: 99%

Detonation Self‐Lubricating Antifriction Glass Composition

Babak

Щепетов

Kharchenko

et al. 2022

Journal of Nanomaterials

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Antifriction self-lubricating glass composite coatings of the Sic-Ni-Cu-Al-Si-C type additionally contain an aluminoborosilicate glass phase and structurally free MgC2, which forms α-graphite during thermolysis, the synergistic effect of which causes modification of the friction surface due to the formation antifriction layer. The influence of the structural components of the coating on their contribution to the antifriction properties is considered. It was clarified that an increase in the adhesive strength of the coatings was achieved by preliminary application of a sublayer of vitreous sodium silicate. The developed coatings showed high performance properties, while the means of minimizing and stabilizing wear characteristics was the presence of a thin-film antifriction layer based on α-graphite, which shields unacceptable processes of molecular-adhesive interaction.

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“…The development of antifriction nanostructured glass-composite self-lubricating coatings meets the modern priorities of tribotechnical materials science aimed at increasing the wear resistance of friction-loaded movable interfaces and, on their basis, the development of scientific and applied solutions in the interests of improving the efficiency of using high-quality production technologies [5,6].…”

Section: Introductionmentioning

confidence: 99%

Nanostructural glass composite coatings

Kharchenko¹,

Kharchenko²

2022

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The results of the study of glass-composite nanostructured self-lubricating coatings are presented. The developed glass composite is an antifriction material with an ultrafine structure. The structural components of these coatings significantly affect the graphitization process and provide an antifriction surface layer of α-graphite. The formation of this layer makes it possible to significantly minimize the contact parameters in the friction region. The developed antifriction nanostructured glass-ceramic self-lubricating coatings containing magnesium carbide and structural components that promote surface graphitization do not contain expensive and scarce components, meet environmental safety requirements, and have high performance characteristics. A significant effect of aluminoborosilicate in the form of a glass phase on the tribological properties of coatings is noted. An increase in adhesive strength is achieved by forming a surface layer of glassy sodium silicate. Using X-ray phase analysis, it was found that the intercalating elements in the subsurface zone-graphite system at the initial stage of the process were Mg2+, Al3+, Cu2+ ions, which randomly penetrated into the interlayer space of the graphite matrix. At sliding speeds of more than 3.0 m/s, intercalates of binary molecular compounds of these elements with oxygen were found in the layered system of graphite. Their intercalation is accompanied by a sequence of repetitive stages, which are reversible with a change in tribological parameters and are characterized by a specific transformation of the structure and, above all, by an increase in the distance between layers due to the influence of various types of interlayer defects and the introduction of intercalants. The presence of near-surface particles in the graphite layer does not affect the tribotechnical characteristics of the coatings. The developed glass-composite nanostructured self-lubricating coatings have high antifriction characteristics throughout the entire load-speed range

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Antifriction Nanocomposite Coatings that Contain Magnesium Carbide

Cited by 29 publications

References 1 publication

Heat protective coatings on niobium alloys

Heat protective coatings on niobium alloys

Detonation Self‐Lubricating Antifriction Glass Composition

Nanostructural glass composite coatings

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