An accurate interface detection of TBCs coated blades by double pulse femtosecond laser-induced breakdown spectroscopy

TY - JOUR

T1 - An accurate interface detection of TBCs coated blades by double pulse femtosecond laser-induced breakdown spectroscopy

AU - Xu, Zhao

AU - Jiang, Lan

AU - Wang, Sumei

AU - Sun, Jiaxin

AU - Zhan, Jie

AU - Zhu, Weihua

N1 - Publisher Copyright: © 2024

PY - 2025/2

Y1 - 2025/2

N2 - To control the laser machining process of cooling holes on thermal barrier coatings (TBCs) deposited on turbine blades, we implemented interface detection in the depth direction by employing femtosecond-laser-induced breakdown spectroscopy (fs-LIBS). With the plasma reheating and reionization effects of double pulses, a maximum spectral enhancement factors of 12.5 was obtained. The signal-to-noise ratio of the spectrum was improved with decreasing the ablation volume. As a result, accurate detection of the interfaces between the yttria-stabilized zirconia (YSZ) coating, Ni-based superalloy substrate and glass slide was achieved. The comparison of the LIBS results with the energy-dispersive X-ray spectroscopy (EDS) confirmed the effectiveness of the detection method, which exhibited a minimum ablation rate of 255 nm per pulse. Furthermore, a practical online detection approach was proposed for depth profiling and breakdown detection during the machining process of multilayer materials with a maximum detection depth of 273 μm.

AB - To control the laser machining process of cooling holes on thermal barrier coatings (TBCs) deposited on turbine blades, we implemented interface detection in the depth direction by employing femtosecond-laser-induced breakdown spectroscopy (fs-LIBS). With the plasma reheating and reionization effects of double pulses, a maximum spectral enhancement factors of 12.5 was obtained. The signal-to-noise ratio of the spectrum was improved with decreasing the ablation volume. As a result, accurate detection of the interfaces between the yttria-stabilized zirconia (YSZ) coating, Ni-based superalloy substrate and glass slide was achieved. The comparison of the LIBS results with the energy-dispersive X-ray spectroscopy (EDS) confirmed the effectiveness of the detection method, which exhibited a minimum ablation rate of 255 nm per pulse. Furthermore, a practical online detection approach was proposed for depth profiling and breakdown detection during the machining process of multilayer materials with a maximum detection depth of 273 μm.

KW - Double pulse

KW - Femtosecond laser

KW - Interface detection

KW - Laser-induced breakdown spectroscopy

UR - https://www.scopus.com/pages/publications/85210632293

U2 - 10.1016/j.sab.2024.107088

DO - 10.1016/j.sab.2024.107088

M3 - Article

AN - SCOPUS:85210632293

SN - 0584-8547

VL - 224

JO - Spectrochimica Acta - Part B Atomic Spectroscopy

JF - Spectrochimica Acta - Part B Atomic Spectroscopy

M1 - 107088

ER -