A new method of laser-plasma synthesis of nanomaterials: first results and prospects

Багаев, С. Н.; Grachev, G. N.; Ponomarenko, A. G.; Смирнов, А. Л.; Demin, V. N.; Okotrub, A. V.; Baklanov, A.; Onischuk, A. A.

doi:10.1117/12.751881

Cited by 6 publications

(5 citation statements)

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“…Malov, A.M. Orishich the direction of gas motion. The spot diameter in the focal plane of the lens was 100 - 150 mm, which provided the pulsed radiation intensity under optimal operation of (7 - 15) ´ 10 8 W cm -2 and an optical breakdown in a supersonic air flow ( 3 ). The laser radiation at the output of the flow and flame zone was measured by a NOVA 2 calorimetric power meter with the limiting measured power of 5 kW ( 6 ).…”

Section: Methodsmentioning

confidence: 99%

Influence of an optical pulsed discharge on the structure of a supersonic air flow

Malov¹,

Orishich²

2014

Quantum Electron.

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Section: Methodsmentioning

confidence: 99%

Influence of an optical pulsed discharge on the structure of a supersonic air flow

Malov¹,

Orishich²

2014

Quantum Electron.

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“…POPD is obtained in the gas under the impact of the laser pulse-periodic radiation of 10 -120 kHz and the laser pulse peak power of 500 kW. In the plasma-chemical synthesis of coatings, the radiation is focused in high-speed gas fluxes of 100 -300 m•s −1 , providing a high gas phase cooling rate after the laser pulse, reduced size of the nucleation centers of solid-phase nuclei and a fast delivery of the decomposition products of reagents to the treated surface [2].…”

Section: Introductionmentioning

confidence: 99%

Laser-Plasma Deposition of Silicon Carbonitride Films by the HMDS Vapor Gas Flow Activation after a Laser Beam Focus

Demin¹,

Borisov²,

Grachev³

et al. 2021

AMPC

Self Cite

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A new laser-plasma deposition method has been developed for the plasma chemical deposition of hard silicon carbonitride coatings on stainless steel substrates from the hexamethyldisilazane (HMDS) Si 2 NH(CH 3 ) 6 vapor in a high-speed Ar and Ar + 10 vol.% He gas stream at the HMDS gas flow activation after the laser beam focus. The method allows depositing silicon carbonitride coatings at the rate of 0.4 -1.2 μm•min −1 , i.e. ~2 times higher than that at introducing HMDS in the laser beam focus zone. The properties of the prepared coatings have been studied by the methods of IR and Raman spectroscopy, atomic force microscopy, nanoindentation and X-ray diffraction (XRD) analysis. Studying the film structure with the use of XRD showed that the prepared silicon carbonitride coatings are X-ray amorphous. It has been found that the coating deposition rate and the structure of coatings depend on the process parameters: HMDS flow rate and plasma-generating gas (argon or (Ar + He). The method allows depositing SiCN films at a high speed and a hardness of 20 -22 GPa.

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“…The present work implements a rigorous but less time-consuming computation model where the interface region of the Knudsen layer is considered explicitly [15]. It concerns modeling the sequences of CO 2 -laser pulses with 10.7 µm wavelength, the duration of 300 ns, and inter-pulse separation of 10 µs, which are promising for high-efficiency surface heat treatment [28]. Estimation of the ionization degree [27] and especially modeling the optical breakdown [4,16] require strong assumptions.…”

Section: Introductionmentioning

confidence: 99%

Sequences of Sub-Microsecond Laser Pulses for Material Processing: Modeling of Coupled Gas Dynamics and Heat Transfer

Gusarov

Ковалев

2019

Applied Sciences

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Multipulse laser processing of materials is promising because of the additional possibilities to control the thickness of the treated and the heat-affected zones and the energy efficiency. To study the physics of mutual interaction of pulses at high repetition rate, a model is proposed where heat transfer in the target and gas-dynamics of vapor and ambient gas are coupled by the gas-dynamic boundary conditions of evaporation/condensation. Numerical calculations are accomplished for a substrate of an austenitic steel subjected to a 300 ns single pulse of CO2 laser and a sequence of the similar pulses with lower intensity and 10 μs inter-pulse separation assuring approximately the same thermal impact on the target. It is revealed that the pulses of the sequence interact due to heat accumulation in the target but they cannot interact through the gas phase. Evaporation is considerably more intensive at the single-pulse processing. The vapor is slightly ionized and absorbs the infrared laser radiation by inverse bremsstrahlung. The estimated absorption coefficient and the optical thickness of the vapor domain are considerably greater for the single-pulse regime. The absorption initiates optical breakdown and the ignition of plasma shielding the target from laser radiation. The multipulse laser processing can be applied to avoid plasma ignition.

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A new method of laser-plasma synthesis of nanomaterials: first results and prospects

Cited by 6 publications

References 0 publications

Influence of an optical pulsed discharge on the structure of a supersonic air flow

Influence of an optical pulsed discharge on the structure of a supersonic air flow

Laser-Plasma Deposition of Silicon Carbonitride Films by the HMDS Vapor Gas Flow Activation after a Laser Beam Focus

Sequences of Sub-Microsecond Laser Pulses for Material Processing: Modeling of Coupled Gas Dynamics and Heat Transfer

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