期刊
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
卷 114, 期 3-4, 页码 857-869出版社
SPRINGER LONDON LTD
DOI: 10.1007/s00170-021-06901-1
关键词
Femtosecond laser; Thermal barrier coatings (TBCs); Laser drilling; Self-focusing; Waveguide effect
资金
- National Natural Science Foundation of China [51775419, 51805420, 51575432]
This study focuses on the fabrication of micro-deep holes on thermal barrier coated alloys using millijoule femtosecond laser beam. The research investigates the self-focusing effect and waveguide effect of the laser beam inside the holes, finding that they can enhance the intensity and shorten the processing time. The section profile of the holes was analyzed, showing successful results with no delamination or recast layer found.
Ultra-short laser drilling of micro-holes with high quality and high processing efficiency in the aviation industry is urgently needed. This study reported the fabrication of micro-deep holes on thermal barrier coated alloys through millijoule femtosecond laser beam irradiation. The self-focusing effect (Kerr effect induced by the intense beam itself) and waveguide effect (reflections induced by the sidewall) on beam propagation behavior inside the micro-deep hole were investigated. The experimental results showed the number of spiral orbits required for through holes has little change within a certain defocus range. Combined with the simulation analyses, it reveals that self-focusing can reinforce the laser intensity in the deep of micro-holes, preventing the beam energy attenuation as the depth of hole increases. Additionally, the guidance and reflection of the sidewall will also make the beam self-converge and enhance its intensity. The enhancement of the laser intensity in the hole cavity can help shorten the processing time. Furthermore, as the aperture increases, the self-focusing still has the noteworthy effect on the intensity enhancement inside the cavity, while the waveguide effect of the sidewall on the intensity enhancement will be weakened. The section profile of holes was analyzed, delamination-free was achieved, and no recast layer was found.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据