航空学报2025，Vol.46Issue(10)：372-384,13.DOI:10.7527/S1000-6893.2025.31555
SiCf/SiC复合材料锥孔飞秒激光加工方法
Femtosecond laser processing method for conical holes in SiCf/SiC composites
摘要
Abstract
Ceramic matrix composites stand out for excellent mechanical properties and high temperature resistance,making them promising for hot-end components of aircraft engines.However,due to their high hardness,brittleness,and low conductivity,processing conical film cooling holes with small aperture,large aspect ratio,and variable cross section has become a challenge.Femtosecond laser processing is an effective solution to this problem.Based on the conical hole structure,both positive and negative helical path were designed,and a two-step rotary drilling method us-ing an inclined laser beam is adopted to achieve high-quality machining of positive and negative conical holes in SiCf/SiC composite materials.The dimensional error of the conical hole entrance and exit is≤10 μm,and the taper error is≤0.1°;the entrance edges were covered with a small amount of deposition,while the exit is free of deposition and has sharp edge.The wall morphology of both the positive and negative conical holes is uniform,with fibers and matrix structures uniformly removed.The surface roughness(Sa)of the hole walls is approximately 1.8 μm for the positive conical hole and 2.5 μm for the negative conical hole.The formation process of the conical holes is studied,and the evolution of the bottom morphology and entrance/exit dimensions is analyzed.The hole profile formation mechanism is clarified,providing a processing foundation and quality evaluation reference for high-quality machining of conical holes in SiCf/SiC composite hot-end components.关键词
陶瓷基复合材料/激光加工/锥孔/加工质量/创成机制Key words
ceramic matrix composites/laser processing/conical hole/processing quality/formation mechanism分类
航空航天引用本文复制引用
李兆基,董志刚,杨峰,鲍岩,康仁科,孙健淞..SiCf/SiC复合材料锥孔飞秒激光加工方法[J].航空学报,2025,46(10):372-384,13.基金项目
国家杰出青年科学基金(52325506) National Natural Science Foundation for Distinguished Young Scholars of China(52325506) （52325506）
