SiCf/SiC复合材料具有轻质、耐高温和高损伤容限等优异性能，已成为新一代航空发动机热端部件的首选材料。本项目基于热端部件切边工艺需求和SiCf/SiC复合材料的热-力-化学特性，提出一种激光辅助超声铣削加工方法。通过研究高温和超声能场辅助的SiCf/SiC复合材料裂纹形成机制和激光辅助SiCf/SiC复合材料高温氧化行为与微裂纹自愈合机理，为确定激光辅助超声铣削工艺参数提供理论依据；通过研究SiCf/SiC复合材料激光辅助超声铣削加工机理以及表面完整性与疲劳性能评价，建立SiCf/SiC复合材料激光辅助超声铣削抗疲劳加工工艺模型，解决加工中存在的缺陷控制、加工精度难以保证和加工效率低等工艺难题，突破SiCf/SiC复合材料构件抗疲劳加工的关键技术。本项目研究成果可为实现SiCf/SiC复合材料高效低损伤加工提供理论和技术指导，推动SiCf/SiC复合材料在国产先进航空发动机上的应用。

SiCf/SiC composites have excellent properties such as light weight, high temperature resistance and high damage tolerance, and have become the preferred materials for hot-section components of new generation aeroengine. In this project, a laser-assisted ultrasonic milling method is proposed based on the requirement of the trimming process of hot-section components and the thermo-mechanical-chemical characteristics of SiCf/SiC composites. By studying the mechanism of crack formation in SiCf/SiC composites assisted with high temperature and ultrasonic energy field and the mechanism of high-temperature oxidation and micro-crack self-healing in laser-assisted SiCf/SiC composites, the theoretical basis for determining the parameters of laser-assisted ultrasonic milling will be provided. And by studying the mechanism of laser-assisted ultrasonic milling of SiCf/SiC composites and the evaluation of surface integrity and fatigue performance, a process model for laser-assisted ultrasonic milling of SiCf/SiC composites will be established to solve the problems of defect control, difficulty in ensuring processing accuracy and low processing efficiency in the processing of SiCf/SiC composites and to break through the key technology of anti-fatigue processing of SiCf/SiC composite components. The research results of this project will provide theoretical and technical guidance for high-efficiency and low-damage processing of SiCf/SiC composites, and promote the application of SiCf/SiC composites in domestic advanced aero-engines.