Specific features of controlling laser systems for micromachining of moving carriers

Bessmeltsev, V. P.; Goloshevsky, N. V.; Smirnov, K. K.

doi:10.3103/s8756699010010103

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…The surface of the unsintered pellet was treated with a CO 2 laser operating at a wavelength of 10.6 µm, using the experimental unit developed by the Institute of Automation and Electrometry SB RAS (Novosibirsk, Russia) [30]. The samples were irradiated by raster scanning of the surface with a focused laser beam in the program control mode with the following parameters: size of laser spot-0.2 mm, scan-line pitch-0.05 mm, scanning speed-500 or 200 mm/s, and laser power-4 W. During the experiments, a white glowing spot was observed on the surface of the exposed sample.…”

Section: Methodsmentioning

confidence: 99%

A Study of Thermal Stability of Hydroxyapatite

et al. 2021

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High-temperature powder sintering is an integral part of the dense ceramic manufacturing process. In order to find the optimal conditions for producing a ceramic product, the information about its behavior at high temperatures is required. However, the data available in the literature are very contradictory. In this work, the thermal stability of hydroxyapatite prepared by a solid-state mechanochemical method and structural changes occurring during sintering were studied. Stoichiometric hydroxyapatite was found to remain as a single-phase apatite structure with the space group P63/m up to 1300 °C inclusively. A further increase in the sintering temperature leads to its partial decomposition, a decrease in the crystallite size of the apatite phase, and the appearance of significant structural strains. It was shown that small deviations from stoichiometry in the Ca/P ratio upward or downward during the hydroxyapatite synthesis lead to a significant decrease in the thermal stability of hydroxyapatite. An apatite containing almost no hydroxyl groups, which is close to the composition of oxyapatite, was prepared. It was shown that the congruent melting of stoichiometric hydroxyapatite upon slow heating in a high-temperature furnace does not occur. At the same time, the fast heating of hydroxyapatite by laser radiation allows, under certain conditions, its congruent melting with the formation of a recrystallized monolayer of oxyhydroxyapatite. The data obtained in this study can be used when choosing sintering conditions to produce hydroxyapatite-based ceramics.

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Section: Methodsmentioning

confidence: 99%

A Study of Thermal Stability of Hydroxyapatite

et al. 2021

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“…The HA pellet surface was irradiated with a CO 2 laser operating at a wavelength of 10.6 μm, using the experimental unit developed by the Institute of Automation and Electrometry SB RAS (Novosibirsk, Russia). An optical-mechanical 2D scanner with Fθ lens was used to scan and focus the laser beam [ 20 ]. During laser treatment, the sample was placed on a Z-axis motion platform made from aluminum and moved in the vertical direction.…”

Section: Methodsmentioning

confidence: 99%

Selective Laser Melting of Hydroxyapatite: Perspectives for 3D Printing of Bioresorbable Ceramic Implants

et al. 2021

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Hydroxyapatite, being the major mineral component of tooth enamel and natural bones, is a good candidate for bone tissue engineering applications. One of the promising approaches for manufacturing of three-dimensional objects is selective laser sintering/melting which enables the creation of a dense structure directly during 3D printing by adding material layer-by-layer. The effect of laser irradiation with a wavelength of 10.6 μm on the behavior of mechanochemically synthesized hydroxyapatite under different treatment conditions was studied for the first time in this work. It was shown that, in contrast to laser treatment, the congruent melting is impossible under conditions of a relatively slow rate of heating in a furnace. Depending on the mode of laser treatment, hydroxyapatite can be sintered or melted, or partially decomposed into the more resorbable calcium phosphates. It was found that the congruent selective laser melting of hydroxyapatite can be achieved by treating the dense powder layer with a 0.2 mm laser spot at a power of 4 W and at a scanning speed of 700 mm/s. Melting was shown to be accompanied by the crystallization of a dense monolayer of oxyhydroxyapatite while preserving the initial apatite crystal lattice. The thickness of the melted layer, the presence of micron-sized pores, and the phase composition can be controlled by varying the scanning speed and laser power. This set of parameters permits the use of selective laser melting technology for the production of oxyhydroxyapatite biodegradable implants with acceptable properties by 3D printing.

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“…Traditionally, lasers are used to form holes in the conductive layer up to hundreds of micrometers in diameter. The most suitable for this task are nanosecond lasers, in view of the ratio of relatively low cost with high average power, low radiation fluctuations [4][5][6][7]. Nanosecond radiation refers to pulses of long duration, as a result of which the effect on the treated surfaces is of a thermal nature.…”

Section: Introductionmentioning

confidence: 99%

High-Precision PCB Topologies Formation by Selective Laser Micromachining

Chkalov

Chkalova

2023

MSF

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The paper considers possibility of using laser radiation to form and correct printed circuit topology boards through micromachining. Processes arising from the interaction of ultrashort laser pulses with processed thin-film coatings are considered. The dependence of the effect of a variable sequence of laser pulses on the quality of the formed holes in coating is presented. Experimental data on the selection of optimal exposure modes of femtosecond radiation on a multilayer coating for selective ablation are presented. Femtosecond laser micromachining allows the precision formation of topological contours, regardless of treated coating type, its thermal and electric conductive properties.

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Specific features of controlling laser systems for micromachining of moving carriers

Cited by 6 publications

References 3 publications

A Study of Thermal Stability of Hydroxyapatite

A Study of Thermal Stability of Hydroxyapatite

Selective Laser Melting of Hydroxyapatite: Perspectives for 3D Printing of Bioresorbable Ceramic Implants

High-Precision PCB Topologies Formation by Selective Laser Micromachining

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