SiCf/SiC材料是新一代发动机热结构件的首选材料。但该材料的各向异性、非均质性、高硬度致使气膜冷却孔超精细加工成为制约航空航天飞行器热防护部件方向发展的瓶颈。本项目提出采用非接触式超短脉冲激光加工技术的新思路，研究SiCf/SiC复合材料与超短脉冲激光的相互作用机理，揭示SiCf/SiC复合材料的非线性非平衡去除机制。并通过开展加工损伤行为研究，建立损伤示踪确定分析方法、损伤显示及内部损伤与力学性能的关联，揭示SiCf/SiC复合材料的结构损伤演化与控制机理。系统研究加工后纤维、界面与基体的残余变形，阐明界面与纤维、界面与基体之间的热应力匹配关系，揭示SiCf/SiC复合材料加工过程的双向梯度变形机制。基于上述研究，建立“超短脉冲激光加工工艺-加工行为-力学性能”的关系模型，揭示超短脉冲激光后SiCf/SiC复合材料的力学性能响应机制，丰富我国陶瓷基复合材料的制备体系。

SiCf/SiC is known as corn material for new generation engines of thermal structural parts. However, the anisotropy, inhomogeneity and high hardness of the material cause the processing of film cooling holes as a bottleneck problem, restricting the development of thermal protection system for aerospace vehicles. A new idea of processing technology which based on the ultra-short pulse laser is proposed in this project. The interaction mechanism between SiCf/SiC composites and ultrashort pulsed laser will be studied. The nonlinear and non-equilibrium mechanism of SiCf/SiC composites will be revealed. And through the research of the processing damage behavior, the analysis method, damage display and correlation between the internal damage and mechanical properties will be established according to the damage tracer. Then, the damage evolution mechanism of SiCf/SiC composites fabricated will be revealed by ultrashort pulse laser. The residual deformation of fiber, interface and matrix after processing will be studied systematically. The thermal-stress relationship between interface and fiber, interface and matrix will be clarified. The deformation mechanism of bidirectional gradient on SiCf/SiC composites will be revealed during the machining process. Based on the above research, a synergistic relationship between “ultra-short pulse laser processing technology, processing behavior and mechanical properties” will be established. The mechanism of the effect of ultrashort pulse laser on the mechanical properties of SiCf/SiC composites will be revealed. Ultimately, these studies will contribute to enrich the preparation system of ceramic matrix composite.