Model experiment on reactive phase formation and solidification of B4C-BN composites via nanosecond pulse laser processing

Kharanzhevskiy, E. V.; Ipatov, A. G.; Krivilyov, M. D.; Makarov, A. V.

doi:10.1140/epjst/e2019-900076-1

Cited by 7 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A distinctive methodology known as “high-energy, short-pulse laser melting” 18 , 19 , was employed to integrate bismuth oxide into the steel matrix as nanoparticles. A distinguishing characteristic of this technology is the ultra-high rates of thermal cycling, capable of generating highly non-equilibrium states of materials, such as amorphous or nanocrystalline phases 30 , 31 . For instance, this technology can stabilize profoundly supersaturated solid solutions in equimolar Cu-Fe alloys 32 .…”

Section: Methodsmentioning

confidence: 99%

Towards eliminating friction and wear in plain bearings operating without lubrication

Kharanzhevskiy,

Ipatov,

Makarov

et al. 2023

Sci Rep

View full text Add to dashboard Cite

Plain bearings, renowned for their versatility and simplicity, are extensively utilized in engineering design across various industries involving moving parts. Lubrication is vital to the functioning of these bearings, yet their usage is inhibited under dynamic load conditions, or at elevated or reduced temperatures due to this dependency on lubrication. This study introduces an innovative method to significantly mitigate friction and wear in plain bearings operating without lubrication. The plain bearings were constructed from steel–bronze pairs, where the steel shafts were alloyed with bismuth oxide via short-pulse laser treatment. MnO2 was utilized as a carrier to incorporate the bismuth oxide into the surface layers of the steel. Insights from transmission electron microscopy and X-ray photoelectron spectroscopy revealed a highly non-equilibrium state of matter, unattainable through conventional engineering methods. The tribological performance of the modified steel disks was assessed via a block-on-ring sliding test, demonstrating superior wear and friction performance without lubrication, as well as an ultra-low coefficient of friction. Remarkably, the modified friction pairs remained functional after 200 km of linear sliding at a load of 250 N (12.5 MPa) and a sliding speed of 9 m/s. To substantiate the technique’s viability, we tested the performance of an internal combustion engine turbocharger fitted with a modified steel shaft. The turbocharger’s performance validated the long-term effectiveness of the steel–bronze coupling operating without lubrication at 75,000 rpm. The simplicity and resilience of this technique for modifying steel–bronze pairs offer a ground-breaking and promising approach for a wide range of applications.

show abstract

Section: Methodsmentioning

confidence: 99%

Towards eliminating friction and wear in plain bearings operating without lubrication

Kharanzhevskiy,

Ipatov,

Makarov

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…A distinctive methodology known as "high-energy, short-pulse laser melting" [13,14] was employed to integrate bismuth oxide into the steel matrix as nanoparticles. A distinguishing characteristic of this technology is the ultra-high rates of thermal cycling, capable of generating highly non-equilibrium states of materials, such as amorphous or nanocrystalline phases [25,26]. For instance, this technology can stabilize profoundly supersaturated solid solutions in equimolar Cu-Fe alloys [27].…”

Section: Methodsmentioning

confidence: 99%

Towards eliminating friction and wear in plain bearings operating without lubrication

Kharanzhevskiy,

Ipatov,

Makarov

et al. 2023

Preprint

View full text Add to dashboard Cite

Plain bearings, owing to their versatility and simplicity, are extensively utilized in engineering design across a variety of industries involving moving parts. Lubrication is vital to the functioning of these bearings so their usage is inhibited under dynamic load conditions or at elevated or reduced temperatures due to this dependency on lubrication. This study introduces an innovative method to significantly mitigate friction and wear in plain bearings operating without lubrication. The plain bearings were constructed from steel-bronze pairs, where the steel shafts were alloyed with bismuth oxide via short-pulse laser treatment. To incorporate the bismuth oxide into the surface layers of the steel, MnO2 was utilized as a carrier. Insights from transmission electron microscopy and X-ray photoelectron spectroscopy exposed a highly non-equilibrium state of matter, which is unattainable through conventional engineering methods. The tribological performance of the modified steel disks was assessed via a block-on-ring sliding test, demonstrating superior wear and friction performance without lubrication, and an ultra-low coefficient of friction. Remarkably, the modified friction pairs remained functional after 200 km of linear sliding at a load of 250 N (12.5 MPa) and a sliding speed of 9 m/s. To substantiate the technique's viability, we tested the performance of an internal combustion engine turbocharger fitted with a modified steel shaft. The turbocharger's performance validated the long-term effectiveness of the steel-bronze coupling operating without lubrication at 75,000 rpm. The simplicity and resilience of this technique for modifying steel-bronze pairs offer a ground-breaking and promising approach for a wide range of applications.

show abstract

“…The cubic form (c-BN) has the sphalerite (Zinc-Blende) crystal structure and hexagonal boron nitride (h-BN) has a layered structure similar to graphite. The transformation from h-BN into c-BN can occur only at high temperatures and pressures obtained during laser annealing or similar techniques like intensive energetic beam treatment of surfaces [27,29,30].…”

Section: Introductionmentioning

confidence: 99%

Structure diagram and dynamics of formation of hexagonal boron nitride in phase-field crystal model

Ankudinov

Galenko

2022

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

The phase-field crystal (PFC-model) is a powerful tool for modelling of the crystallization in colloidal and metallic systems. In the present work, the modified hyperbolic phase-field crystal model for binary systems is presented. This model takes into account slow and fast dynamics of moving interfaces for both concentration and relative atomic number density (which were taken as order parameters). The model also includes specific mobilities for each dynamical field and correlated noise terms. The dynamics of chemical segregation with origination of mixed pseudo-hexagonal binary phase (the so-called ‘triangle phase’) is used as a benchmark in two spatial dimensions for the developing model. Using the free energy functional and specific lattice vectors for hexagonal crystal, the structure diagram of co-existence of liquid and three-dimensional hexagonal phase for the binary PFC-model was carried out. Parameters of the crystal lattice correspond to the hexagonal boron nitride (BN) crystal, the values of which have been taken from the literature. The paper shows the qualitative agreement between the developed structure diagram of the PFC model and the previously known equilibrium diagram for BN constructed using thermodynamic functions. This article is part of the theme issue ‘Transport phenomena in complex systems (part 2)’.

show abstract

Model experiment on reactive phase formation and solidification of B4C-BN composites via nanosecond pulse laser processing

Cited by 7 publications

References 17 publications

Towards eliminating friction and wear in plain bearings operating without lubrication

Towards eliminating friction and wear in plain bearings operating without lubrication

Towards eliminating friction and wear in plain bearings operating without lubrication

Structure diagram and dynamics of formation of hexagonal boron nitride in phase-field crystal model

Contact Info

Product

Resources

About