Micromachining of Metals, Alloys, and Ceramics by Picosecond Laser Ablation

Wei, Hu; Shin, Yung C.; King, Galen B.

doi:10.1115/1.4000836

Cited by 41 publications

(14 citation statements)

References 36 publications

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“…Hu et al [83] reported micro-hole drilling and micro-structure machining in metals, alloys and ceramics using ps laser. Holes of below 50 mm diameter in steel, Si 3 N 4 and SiC/SiC were fabricated with percussion drilling technique by using laser of wavelength 532 nm or 1064 nm.…”

Section: Lbmm Using Ps Lasersmentioning

confidence: 99%

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Laser Beam MicroMachining (LBMM) – A review

Mishra¹,

Yadava

2015

Optics and Lasers in Engineering

227

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Section: Lbmm Using Ps Lasersmentioning

confidence: 99%

“…The electronic properties may be obtained from a modified ThomasFermi statistical model and the ionic properties are calculated by Cowan model [83].…”

Section: Initial Conditionsmentioning

confidence: 99%

Laser Beam MicroMachining (LBMM) – A review

Mishra¹,

Yadava

2015

Optics and Lasers in Engineering

227

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“…Ultra-short laser pulses have a broad range of industrial applications and have been used for surface modifications of solid materials and precise micromachining [1][2][3] . In order to further optimize the laser process a deep understanding of the dynamics behind the laser ablation is essential.…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent determination of electron heat capacity and electron-phonon coupling factor forFe0.72Cr0.18Ni0.1

et al. 2016

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A theoretical approach using ab initio calculations has been applied to study the interaction of an ultra-short laser pulse with the metal alloy Fe0.72Cr0.18Ni0.1 (AISI 304). The electronic structure is simulated by taking into account the chemical and magnetic disorder of the alloy by the coherent potential approximation implemented in a fully relativistic Korringa-Kohn-Rostoker-formalism in the framework of spin density functional theory. Utilizing these predictions we determined the electron heat capacity and the electron-phonon coupling factor of Fe0.72Cr0.18Ni0.1 in dependence on the electron temperature for two-temperature model applications. Compared with pure Fe a maximum deviation of 5 % for the electron heat capacity and 25 % for the electron-phonon coupling factor is found.

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“…However, the formation of recast layer and the thermal damage to the workpiece has caused much attention when using these lasers [18]. It has been suggested that a reduction in pulse duration down to picosecond and femtosecond scale could probably overcome these issues, and therefore, many researchers have investigated laser drilling with ultra-short pulses on the basis of percussion or trepanning regime [19,20]. In spite of the positive advocation of femtosecond laser in micro-machining, it was pointed out by Dausinger et al [21] that when the pulse duration was below 10 picoseconds, a further reduction would produce no remarkable advantage for material removal, at least for metals.…”

Section: Discussionmentioning

confidence: 99%

An investigation on the hole quality during picosecond laser helical drilling of stainless steel 304

Zhang

Zhou

et al. 2015

Appl. Phys. A

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Precision drilling with ultra-short pulse lasers (e.g., picosecond and femtosecond) has been advocated to significantly improve the quality of the micro-holes with reduced recast layer thickness and no heat-affected zone. However, a combination of high-power picosecond laser with helical drilling strategy in laser drilling has rarely been reported in previous studies. In the present study, a series of micro-holes with circular, triangular, rectangular, and rhombic shapes (diameter 0.6 mm) were manufactured on stainless steel 304 using a newly developed laser drilling system which incorporated a picosecond laser and a high-speed laser beam rotation apparatus into a five-axis positioning platform. The quality of the helical drilled holes, e.g., recast layer, micro-crack, circularity, and conicity, were evaluated using an optical microscope, an optical interferometer, and a scanning electron microscope. In addition, the microstructure of the samples was investigated following etching treatment. It was demonstrated that the entrance ends, the exit ends, and the side walls of the micro-holes were quite smooth without accumulation of spattering material and formation of recast layer and micro-crack. No tapering phenomenon was observed, and the circularity of the holes was fairly good. There was no distinctive difference with regard to the microstructure between the edges of the holes and the bulk material. Picosecond laser helical drilling can be an effective technique for manufacturing of micro-holes with very high quality. The development of high-power picosecond laser would promote picosecond laser drilling to be more industrial relevance in the future.

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Micromachining of Metals, Alloys, and Ceramics by Picosecond Laser Ablation

Cited by 41 publications

References 36 publications

Laser Beam MicroMachining (LBMM) – A review

Laser Beam MicroMachining (LBMM) – A review

Temperature-dependent determination of electron heat capacity and electron-phonon coupling factor forFe0.72Cr0.18Ni0.1

An investigation on the hole quality during picosecond laser helical drilling of stainless steel 304

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