Optical and thermal properties of metals, ceramics, and CVD diamond films upon high-temperature laser heating

Tsarkova, O. G.

doi:10.3103/s1541308x07010025

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…It is, therefore, worth mentioning that the simulation time when using our model was of 10 min only, significantly inferior to Shukla and Lawrence's simulation of about 2 h [15]. Moreover, our model can be considered a very powerful one but also a very friendly to use: for writing the software one may need 20 min and on the other hand the run time of a complete simulation is down than 10 min on a commercial PC (which is much lower than the usual time for numerical models [15,[27][28][29][30]).…”

Section: Resultsmentioning

confidence: 76%

Laser Additive Manufacturing of Bulk Silicon Nitride Ceramic: Modeling versus Integral Transform Technique with Experimental Correlation

et al. 2022

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A semi-analytical-numerical solution is theorized to describe the laser additive manufacturing via laser-bulk ceramic interaction modeling. The Fourier heat equation was used to infer the thermal distribution within the ceramic sample. Appropriate boundary conditions, including convection and radiation, were applied to the bulk sample. It was irradiated with a Gaussian spatial continuous mode fiber laser (λ = 1.075 µm) while a Lambert-Beer law was assumed to describe the laser beam absorption. A close correlation between computational predictions versus experimental results was validated in the case of laser additive manufacturing of silicon nitride bulk ceramics. The thermal field value rises but stays confined within the irradiated zone due to heat propagation with an infinite speed, a characteristic of the Fourier heat equation. An inverse correlation was observed between the laser beam scanning speed and thermal distribution intensity. Whenever the laser scanning speed increases, photons interact with and transfer less energy to the sample, resulting in a lower thermal distribution intensity. This model could prove useful for the description and monitoring of low-intensity laser beam-ceramic processing.

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Section: Resultsmentioning

confidence: 76%

Laser Additive Manufacturing of Bulk Silicon Nitride Ceramic: Modeling versus Integral Transform Technique with Experimental Correlation

et al. 2022

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“…This efficiency is determined by the product of the efficiency η t of single-mode laser radiation transport in the waveguide regime, coefficient η a of radiation absorption by the metal surface (η a = 30-45% for λ ~1 μm) (Tsar'kova, 2004), and the fraction ε of heat losses in the cut zone. These thermal losses are mostly related to thermal conduction in four directions over a characteristic distance of √4⋅<χ с >⋅τ rad ≈350 μm.…”

Section: Analysis Of Experimental Results and Construction Of A Modelmentioning

confidence: 99%

Investigation of Precision Large-Caliber Slot Cutting of Sheet Steel Using Single-Mode Fiber Laser Radiation

Soroka¹,

Panchenko²,

Vitshas³

et al. 2014

APR

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We present results of the experimental and theoretical investigation of the characteristics and features of precision large-caliber slot cutting of low-carbon steel sheets with thicknesses up to 10 mm by radiation of 1-kW single-mode fiber laser. Using periodic-pulsed single-mode laser radiation and oxygen as the cutting gas, slots with calibers from 20 to 60 (in some cases -up to 100) and widths up to about 60 microns have been obtained. The cutting speed (50-100 mm/min) was measured and the efficiency of precision cutting (≈3%) and efficiency of laser radiation transport in the waveguide mode (≈25%) were estimated. The morphology and roughness parameters of the cut surface were determined. Variation of the hardness and phase structure of steel in the direction of normal to the slot wall were studied. A qualitative model of laser oxygen precision slot cutting with deep channeling is proposed.

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Laser hardening process optimization using FEM

Martinovs

Polukoshko

Zaicevs

et al. 2020

Engineering for Rural Development

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Optical and thermal properties of metals, ceramics, and CVD diamond films upon high-temperature laser heating

Cited by 5 publications

References 11 publications

Laser Additive Manufacturing of Bulk Silicon Nitride Ceramic: Modeling versus Integral Transform Technique with Experimental Correlation

Laser Additive Manufacturing of Bulk Silicon Nitride Ceramic: Modeling versus Integral Transform Technique with Experimental Correlation

Investigation of Precision Large-Caliber Slot Cutting of Sheet Steel Using Single-Mode Fiber Laser Radiation

Laser hardening process optimization using FEM

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