Mechanism of Femtosecond Laser Polishing of YSZ Coating Under Grazing Incidence

Liang Wang; Hanqi Wu; Zhenhe Yu; Yi Han; Yaxing Wang; Yunpeng Wang; Panpan Zhang; Jianhua Yao

doi:10.3788/CJL240610

Chinese Journal of Lasers, Volume. 51, Issue 24, 2402201(2024)

Mechanism of Femtosecond Laser Polishing of YSZ Coating Under Grazing Incidence

Liang Wang^1,2,3, Hanqi Wu^1,2,3, Zhenhe Yu⁴, Yi Han^1,2,3, Yaxing Wang^1,2,3, Yunpeng Wang^1,2,3, Panpan Zhang^1,2,3, and Jianhua Yao^1,2,3、*

Author Affiliations

¹Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310023, Zhejiang , China

²Ministry of Education/Zhejiang Provincial Key Laboratory of Special Equipment Manufacturing and Advanced Processing Technology, Hangzhou 310015, Zhejiang , China

³College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, Zhejiang , China

⁴AECC Shenyang Liming Aero-Engine Co., Ltd., Shenyang 110043, Liaoning ,China

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Figures & Tables(12)

Fig. 1. Schematics of processing system and Rayleigh length. (a) Schematic of grazing incidence femtosecond laser polishing system;

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Fig. 2. Surface morphology and profile structures after single-spot continuous ablation. (a) Three dimensional morphology after single-spot continuous ablation; (b) cross-sectional profiles at ablation position

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Fig. 3. Three dimensional morphology and profile structure after single-layer ablation. (a) Three dimensional morphology after single-layer ablation; (b) cross-sectional profile

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Fig. 4. Schematic of scanning path for femtosecond laser grazing incidence polishing and surface morphology after polishing.

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Fig. 5. Surface morphologies under different $φ_{X}$ . (a) $φ_{X}$ =0%; (b) $φ_{X}$ =10%; (c) $φ_{X}$ =20%; (d) $φ_{X}$ =30%; (e) $φ_{X}$ =40%; (f) $φ_{X}$ =50%; (g) $φ_{X}$ =60%; (h) $φ_{X}$ =70%; (i) $φ_{X}$ =80%; (j) $φ_{X}$ =90%

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Fig. 6. Analysis results of coating surface roughness. (a) Comparison of coating surface roughness under different overlap rates; (b) SEM image of original surface; (c) SEM image at 0% overlap rate; (d) SEM image at 20% overlap rate; (e) SEM image at 80% overlap rate

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Fig. 7. Spectrum analysis results of surface profiles after grazing incidence polishing. (a) Surface profile curves; (b) spectra after FFT

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Fig. 8. Cross-section morphologies of YSZ coating. (a) Metallographic image of cross section; (b) SEM image of cross section; (c) laser focused image of longitudinal section

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Fig. 9. Ablation mechanism diagrams under different overlap rates. (a) 80% overlap rate; (b) 20% overlap rate

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Table 1. Chemical compositions of NiCrAIY powder
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Table 1. Chemical compositions of NiCrAIY powder
Element Ni Cr Al Y
Mass fraction /% Bal. 21.0‒23.0 2.0‒4.0 0‒0.4

Table 2. Chemical compositions of YSZ powder
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Table 2. Chemical compositions of YSZ powder
Element Zr Y O
Mass fraction /% Bal. 2.0‒3.0 5.1

Table 3. Process parameters under different overlap rates

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Table 3. Process parameters under different overlap rates

No.	$φ_{X}$ /%	Pulse energy /μJ	Scanning speed / （mm·s^-1）	Scanning time
1	0	250	4000	4000
2	10	250	3600	3600
3	20	250	3200	3200
4	30	250	2800	2800
5	40	250	2400	2400
6	50	250	2000	2000
7	60	250	1600	1600
8	70	250	1200	1200
9	80	250	800	800
10	90	250	400	400

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Liang Wang, Hanqi Wu, Zhenhe Yu, Yi Han, Yaxing Wang, Yunpeng Wang, Panpan Zhang, Jianhua Yao. Mechanism of Femtosecond Laser Polishing of YSZ Coating Under Grazing Incidence[J]. Chinese Journal of Lasers, 2024, 51(24): 2402201

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