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

被引:0
作者
Xu, Zhao [1 ]
Jiang, Lan [1 ]
Wang, Sumei [1 ]
Sun, Jiaxin [1 ]
Zhan, Jie [1 ]
Zhu, Weihua [1 ]
机构
[1] Beijing Inst Technol, Sch Mech Engn, Laser Micro Nano Fabricat Lab, Beijing 100081, Peoples R China
关键词
Laser-induced breakdown spectroscopy; Femtosecond laser; Interface detection; Double pulse; REAL-TIME; ENHANCEMENT; PLASMA; LAYERS; EFFICIENCY; ABLATION; LIBS;
D O I
10.1016/j.sab.2024.107088
中图分类号
O433 [光谱学];
学科分类号
0703 ; 070302 ;
摘要
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 mu m.
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页数:10
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