Microstructural evolution of carbon fiber reinforced SiC-based matrix composites during laser ablation process

Xiaolin Dang¹，Xiaowei Yin¹，Xiaomeng Fan¹，Yuzhao Ma¹，Jiangtao Wang²，Panfei Ju¹，Hongwei Song²

1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University2. Key Laboratory for Mechanics in Fluid-Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences

摘 要：In this work, four different carbon fiber reinforced SiC-based matrix composites（C/SiC） were prepared,and microstructure evolution during laser ablation process was characterized. Laser irradiation provided a special high-temperature environment up to 3500?C. For all four composites, different morphologies can be obtained in the transition region due to the oxidation of different matrices. While only needle-shaped carbon fiber and nanolayered carbon without any matrix remained in the central region, indicating that graphitization process occurred in the center, resulting from the high-temperature and low-oxygen environment in the laser process. Therefore, the laser ablation of C/SiC composites is controlled by chemical and physical erosion, and mainly by the physical erosion in the center.

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