Femtosecond laser high-quality drilling of film cooling holes in nickel-based single superalloy for turbine blades with a two-step helical drilling method

Li, Meng; Wang, Ping; Liu, Yu-xing; Li, Zhenwei; Yue, Zhufeng

doi:10.1016/j.jmatprotec.2022.117827

Cited by 20 publications

(3 citation statements)

References 34 publications

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“…The sharp edge is significantly affected by picosecond laser processing, resulting in a relatively uneven coating surface. (2) The microhardness of the coating on the obtuse-angle side of the hole perimeter is generally higher than that on the acute-angle side. This is attributed to the greater influence of molten material ejected from the substrate and accumulated on the surface of the thermal barrier coating on the acute-angle side.…”

Section: Discussionmentioning

confidence: 99%

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Investigation on Thermal Barrier Coating Damages for Ultrafast Laser Drilling of Cooling Holes

Wang,

Hu,

Zuo

et al. 2023

Materials

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To mitigate the challenges pertaining to coating damage and processing defects arising from the utilization of ultrafast laser drilling for microhole creation in thermal barrier coatings (TBCs), thereby exerting substantial influence on the long-term durability of these microholes, the investigation proposes a comprehensive methodology. It encompasses the design of a two-factor four-level full factorial experiment and the execution of experimental research on picosecond laser drilling of TBC microholes. By meticulously analyzing the morphology of the microholes and the coating interface, the damage mechanisms associated with picosecond laser drilling of TBC microholes, as well as the influence of laser process parameters on coating damage, are revealed. The findings reveal that the optimal microhole entrance quality and the lowest roughness along the hole perimeter are attained at a laser power of 12 W and a scanning speed of 320 mm/s. Moreover, at a laser power of 30 W and a scanning speed of 320 mm/s, the minimal crack length on the blunt angle side of the hole and the highest machining quality are observed.

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Section: Discussionmentioning

confidence: 99%

“…Currently, turbine blades widely employ thermal barrier coatings (TBCs) and incorporate composite film cooling techniques, utilizing single-crystal hollow blades. These advancements significantly bolster the blades' capacity to withstand elevated temperatures [1,2], as illustrated in Figure 1.…”

Section: Introductionmentioning

confidence: 96%

Investigation on Thermal Barrier Coating Damages for Ultrafast Laser Drilling of Cooling Holes

Wang,

Hu,

Zuo

et al. 2023

Materials

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“…The surface can be chemically cleaned (etched); however, this process results in an increase in the hole diameter. The spatter formed by machining cannot be completely discharged from the hole because it adheres to the hole wall, reducing the surface quality of the hole wall [28]. But this disadvantage becomes advantage in case making filter or adsorbtion sensor.…”

Section: Third Harmonic Drilling Gridmentioning

confidence: 99%

Picosecond laser drilling grids in aluminium foil at 532 and 355 nm wavelengths

Tojinazarov,

Sobirov,

Ibragimova

et al. 2024

Eng. Res. Express

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Ultra-short laser drilling technique enables production of filters, membranes, microfluidic, photonic, and biomedical devices. Micro-hole grids were drilled in aluminum foil using a 28 picosecond Nd:YAG laser operated at wavelength of 532 and 355 nm with energy up to 18 and 12 mJ, respectively. Varying pulse energy and number, micro-holes obtained at 355 nm and 3.6-9 mJ had the appropriate mean diameter of 36-86 μm. However, the circularity changed in 0.5-0.94. For the 2nd harmonic the mean diameter varied 15-61 μm at 0.36-9 mJ with the circularity of 0.81-0.92. The morphology of the area surrounding micro-holes investigated by scanning electron microscopy exhibited distribution of droplets dominated size 0.9-10 μm , which is feasible for filtration of contaminated liquids. Local elemental composition of the area determined by energy dispersive spectroscopy discovered significant increase in the concentration of C and O, and also emergency of F, depending on laser fluence under vapor-dominated ablation mode, where nuclear reactions are excited in hot plasma.

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Sustainable production of powder feedstock from machining waste using modulation-assisted drilling

Singh,

Dhiman,

Singh

et al. 2024

Int J Adv Manuf Technol

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Femtosecond laser high-quality drilling of film cooling holes in nickel-based single superalloy for turbine blades with a two-step helical drilling method

Cited by 20 publications

References 34 publications

Investigation on Thermal Barrier Coating Damages for Ultrafast Laser Drilling of Cooling Holes

Investigation on Thermal Barrier Coating Damages for Ultrafast Laser Drilling of Cooling Holes

Picosecond laser drilling grids in aluminium foil at 532 and 355 nm wavelengths

Sustainable production of powder feedstock from machining waste using modulation-assisted drilling

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