Nanosecond laser ablation of AlN ceramic

Nedyalkov, N.N.; Dikovska, A.; Александров, Л. Н.; Terakawa, Mitsuhiro

doi:10.1007/s00339-021-05106-3

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…In this way the laser fluences used in the experiments are: 20 J/cm 2 for ns experiments; 2 J/cm 2 for ps experiments, and 0.7 J/cm 2 for fs experiments. Note that at higher fluences at nanosecond laser processing, a decrease of the ablation rate is observed [13], due to interaction of the laser radiation with the ablated material. The ablation depth of the ablated area is estimated by pre-focusing of the samples surface and the ablation spot bottom, using optical microscope (OPTICA B-150).…”

Section: Methodsmentioning

confidence: 97%

“…Considering the ablation rate, one can consider also the laser absorption mechanisms that can depend on the laser pulse duration. For application of ns pulses, linear absorption dominates as the absorption coefficient for AlN and Si3N4 is in order of 10 2 cm -1 [13,14]. At this value the laser radiation propagates into the material at depth of tens of micrometers.…”

Section: Figurementioning

confidence: 99%

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Influence of the pulse duration at the laser processing of nitride ceramics

Nedyalkov,

Dikovska,

Dilova

et al. 2024

J. Phys.: Conf. Ser.

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This paper presents results on laser ablation of AlN and Si3N4 ceramics by laser pulses with different duration. Three types of laser systems, a Nd:YAG one, operated at wavelength of 1064 nm and pulse duration of 15 ns, a Nd:YAG, operated at wavelength of 1064 nm and pulse duration of 10 ps, and a femtosecond laser system, operated at 800 nm, with a pulse duration of 75 fs, are used for experiments. Details on the ablation efficiency, surface morphology, and the chemical composition of the irradiated zones as a function of the pulse duration are given and discussed. It is demonstrated that the ablation rate (ablation depth per pulse) is highest for processing with nanosecond pulses and it is lowest for the femtosecond regime. The laser ablation results in significant change of the surface morphology, as its characteristics are influenced by the pulse duration. For all pulse durations conditions for formation of ripples structures are found. The ablation process is realized by decomposition of the ceramics and the composition of the remaining surface layer is governed by oxidation and carbonization.

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Section: Methodsmentioning

confidence: 97%

Section: Figurementioning

confidence: 99%

Influence of the pulse duration at the laser processing of nitride ceramics

Nedyalkov,

Dikovska,

Dilova

et al. 2024

J. Phys.: Conf. Ser.

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“…Nanosecond pulsed laser ablation (NPLA) has the advantages of high processing accuracy and environmental protection compared with traditional processing [1][2][3]. Meanwhile, compared with picosecond and femtosecond lasers, nanosecond lasers have a lower cost [4]. So, a nanosecond laser can achieve the efficient and low-cost manufacturing of the microgroove that is the basic unit of the ridge surface used to reduce frictional resistance in spacecraft walls [2,5].…”

Section: Introductionmentioning

confidence: 99%

Prediction method of radial heat affected zone width in nanosecond pulsed laser ablation of TC4

Wang¹,

Zhang²,

et al. 2022

Preprint

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Nanosecond pulsed laser ablation (NPLA) is widely used in micromachining. However, during the machining process, the radial heat-affected zone (RHAZ) will deteriorate the machining quality and accuracy of the microgroove, which is the basic unit of the ridge surface used to reduce frictional resistance in spacecraft walls. Its effective prediction is crucial for the processing precision control of microgrooves to ensure the drag reduction performance of the ridge surface. For this reason, this paper proposes an effective method to predict the RHAZ width. TC4, commonly used in aerospace, is the target material in this work. By comprehensively considering the thermal accumulation effect of laser pulses and the superimposability of the temperature field, and based on the point heat source method, a dynamic temperature distribution model in NPLA is established. Then, the RHAZ width is initially predicted by combining the graphical method and the RHAZ definition. Finally, to improve the prediction accuracy of the RHAZ width. A correction factor is obtained by the NPLA of microgrooves on TC4. The relative error between the predicted RHAZ width and observed values is less than 7% after introducing the correction factor, which verifies the reliability and validity of the proposed prediction method for the RHAZ width. Furthermore, the RHAZ width in NPLA of TC4 is on the order of hundreds of microns, which should be considered to ensure its processing quality when the ridge surface is designed on TC4. The research method in this paper will guide the design of high-density functional patterns and their high-precision preparation and has significant engineering practical value.

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Prediction method of radial heat-affected zone width in nanosecond pulsed laser ablation of TC4 titanium alloy

Wang

Zhang

et al. 2022

Int J Adv Manuf Technol

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Nanosecond laser ablation of AlN ceramic

Cited by 6 publications

References 19 publications

Influence of the pulse duration at the laser processing of nitride ceramics

Influence of the pulse duration at the laser processing of nitride ceramics

Prediction method of radial heat affected zone width in nanosecond pulsed laser ablation of TC4

Prediction method of radial heat-affected zone width in nanosecond pulsed laser ablation of TC4 titanium alloy

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