中国激光, 2013, 40 (8): 0803001, 网络出版: 2013-07-26   

采用532 nm纳秒光纤激光对金属和热障涂层的激光微加工

Micromachining of Metals and Thermal Barrier Coatings Using a 532 nm Nanosecond Fiber Laser
作者单位
上海交通大学密西根学院,上海 200240
摘要
涡轮叶片上气膜冷却孔的精密制造是一项复杂的技术,特别覆有热障涂层的金属叶片的加工尤为困难。实验采用532 nm的镱离子光纤纳秒脉冲激光研究脉冲激光束和陶瓷涂层或金属基材料之间的物理相互作用。通过半经验模型和有限元模型研究了激光与材料的相互作用,并预测了材料消融表面的几何形状。通过建模和实验数据之间的比较,进一步优化加工参数以获得最大的去除效率,并保证最少的由热效应引起的缺陷,如重铸层、边缘突起和微裂纹等。通过改变焦深、扫描模式、光斑半径和功率密度来研究激光与不锈钢、铜、镍铬铁合金718和氧化锆热障涂层等材料的相互作用。实验获得了激光能量密度阈值和材料最佳去除效率,并且验证了模拟的结果。
Abstract
Precision manufacturing of the shaped film cooling holes on turbine blades is a challenge, especially when the metal blades are coated with thermal barrier coatings (TBC). A 532 nm nanosecond pulsed ytterbium fiber laser is used to study the physical interactions between pulsed laser beam and metal or ceramic materials. Using a semi-empirical model and finite element model, we study the interaction of laser and material, and predict laser ablation surface geometry. Results are compared between modelling and experimental data. Optimized machining parameters are recommended with the aim of maximum process efficiency and minimum thermal effects such as recast layer, edge protrusions and microcracks. By varying depth of focus, scanning mode, beam diameter and power density, the interaction between laser and stainless steel, copper, TBC and IN718 are investigated. Laser ablation energy density threshold values and the best material removal rate are obtained, and the result of simulation is verified.

赖宏坤, 齐欢. 采用532 nm纳秒光纤激光对金属和热障涂层的激光微加工[J]. 中国激光, 2013, 40(8): 0803001. 赖宏坤, 齐欢. Micromachining of Metals and Thermal Barrier Coatings Using a 532 nm Nanosecond Fiber Laser[J]. Chinese Journal of Lasers, 2013, 40(8): 0803001.

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