An investigation into delamination mechanisms in inclined laser drilling of thermal barrier coated aerospace superalloys

2005 ◽  
Vol 17 (4) ◽  
pp. 225-234 ◽  
Author(s):  
H. K. Sezer ◽  
A. J. Pinkerton ◽  
Lin Li ◽  
P. Byrd
Keyword(s):  
Laser Drilling ◽  
Thermal Barrier

Delamination-free millisecond laser drilling of thermal barrier coated aerospace alloys

2019 ◽  
Vol 31 (4) ◽  
pp. 042001 ◽  
Author(s):  
Sundar Marimuthu ◽  
Bethan Smith ◽  
Aislinn Kiely ◽  
Yijun Liu
Keyword(s):  
Laser Drilling ◽  
Thermal Barrier ◽  
Aerospace Alloys ◽  
Millisecond Laser

scholarly journals Enhanced Molten Salt Resistance by Sidewall Pores Repair during Fs Laser Drilling of a Thermal Barrier-Coated Superalloy

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1905
Author(s):  
Zhengjie Fan ◽  
Xiaomao Sun ◽  
Xuesong Mei ◽  
Rujia Wang
Keyword(s):  
Molten Salt ◽  
Low Frequency ◽  
Salt Resistance ◽  
Laser Drilling ◽  
Thermal Barrier ◽  
Transient Pressure ◽  
Cooling Hole ◽  
Fs Laser ◽  
Transformation Stress ◽  
Plasma Sprayed

In this study, a novel laser-modified drilling method was used to manufacture cooling holes through thermal barrier coatings (TBCs). Due to the “cooling processing” properties during low-frequency femtosecond (LF-fs) laser drilling, the exposure of the sidewall pores, and the interlayer clearance, the inherent characteristics of plasma-sprayed coatings induced sidewall defects in the drilled holes. After drilling, a high-frequency fs (HF-fs) laser was used to repair the sidewall pores and interlayer clearance of the drilled ceramic holes. Then, the pores and microcracks were healed by local melting using the laser. Moreover, instead of obtaining laser-induced periodic surface structures (LIPSSs), refined and homogeneous grains were produced by the HF-fs laser repair treatment at high transient pressure and temperature. The results from a high-temperature corrosion test showed that healing of the open pores and microstructural improvement in the ceramic hole walls prevented the out-diffusion of Y2O3 stabilizers and the penetration of molten salt, resulting in less corrosive products and producing corresponding phase-transformation stress. Thus, reducing the stabilizer consumption can moderate corrosion fatigue and prolong the lifetime of a cooling hole and TBCs under service.

Computational and experimental study on hole evolution and delamination in laser drilling of thermal barrier coated nickel superalloy

2018 ◽  
Vol 107 ◽  
pp. 161-175 ◽  
Author(s):  
Rujia Wang ◽  
Wenqiang Duan ◽  
Kedian Wang ◽  
Xia Dong ◽  
Zhengjie Fan ◽  
...  
Keyword(s):  
Experimental Study ◽  
Nickel Superalloy ◽  
Laser Drilling ◽  
Thermal Barrier
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