飞秒激光带热障涂层叶片气膜孔加工技术研究进展

Development of Gas Film Holes Machining on Turbine Blades with Thermal Barrier Coating by Femtosecond Laser

航空发动机涡轮叶片采用热障涂层技术和气膜孔冷却技术可以大大提升叶片的耐温能力,因此可以显著提高发动机的工作温度使其具有更高的推重比和效率。而在带有热障涂层叶片上实现高品质和高精度冷却气膜孔的加工是发动机制造技术的难点。由于飞秒激光加工具有材料无选择性、无热影响区及加工精度高等特点,因此飞秒激光成为加工带热障涂层叶片气膜孔的研究热点。阐述了飞秒激光与叶片涂层和基体材料的作用原理和飞秒激光微孔加工的技术特点,介绍了飞秒激光带热障涂层叶片气膜孔加工技术的研究过程和发展现状,展望了该技术在高精度带热障涂层叶片气膜孔制造中的应用前景。

The gas film holes machining on turbine blades with thermal barrier coating can greatly increase me operating temperature of the engine, which has higher thrust weight ratio and efficiency. However, the gas film holes which have the characteristics of high quality and high precision machining on turbine blades with thermal barrier coating is the difficult problem in the field of aviation manufacturing. Femtosecond laser micro-hole machining has the characteristics of no selective material, no heat affected zone and high machining precision. So it is the research hotspots in the field of gas film holes processing on turbine blades with thermal barrier coating. In this paper, the principle of femtosecond laser micromachining material was described. And the technical characteristics of femtosecond laser micro-hole machining were introduced. Then, the research process and development status of femtosecond laser machining of gas film holes on thermal barrier coatings were introduced. Finally, the prospect of the application of this technology in the manufacturing of high thermal barrier coating was prospected. precision gas film holes machining on turbine blades with