Twin gas jet-assisted laser drilling through thermal barrier-coated nickel alloy substrates
Twin gas jet-assisted laser drilling through thermal barrier-coated nickel alloy substrates
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DOI：
10.1016/j.ijmachtools.2009.07.002
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发表时间：
2009-11
影响因子：
14
通讯作者：
H. K. Sezer;Lin Li;S. Leigh
中科院分区：
文献类型：
--
作者：
H. K. Sezer;Lin Li;S. Leigh
在航空发动机部件的某些部件上激光制造冷却孔涉及与表面成锐角的冲击或环钻。这些部件通常覆盖有等离子喷涂陶瓷热障涂层 (TBC)，以防止它们在热发动机环境中达到过高温度。 TBC 分层是在涂层部件上激光钻锐角孔的主要问题。本研究研究了一种新技术，能够在不分层的情况下钻穿热障涂层材料。该技术基于利用二次气体射流控制熔体流动轨迹和孔壁上的冲击角度。已证明与工件表面成 30° 倾斜的无分层激光钻孔。开发了钻孔过程中熔体流动的基于有限体积的数值模型，以了解二次射流在防止分层方面的效果。
Laser fabrication of cooling holes in certain parts of the aero-engine components involves percussion or trepan drilling at acute angles to the surface. These parts are often covered with plasma sprayed ceramic thermal barrier coatings (TBC) to protect them from reaching excessive temperatures in hot engine environments. Delamination of the TBC is the main problem of laser drilling acute angled holes in the coated components. The present study investigates a novel technique enabling to drill through thermal barrier-coated materials without delamination. The technique is based on the control of the melt flow trajectories and impact angle on the hole walls utilizing a secondary gas jet. Delamination-free laser-drilled holes inclined at 30° to the workpiece surface have been demonstrated. Finite volume-based numerical modelling of melt flow during the drilling process was developed to understand the effect of secondary jet in the prevention of delamination.