C/YAG复合材料的抗烧蚀性能研究

目的对C/YAG复合材料的烧蚀性能和烧蚀机理进行研究。方法以高固相含量Y_2O_3-Al_2O_3溶胶为原料,低成本的碳纤维针刺毡为增强体,通过浸渍-干燥-热处理工艺制备C/YAG复合材料,利用SEM和XRD对烧蚀后材料的微观结构和物相组成进行分析。结果复合材料的质量烧蚀率和线烧蚀率分别为0.05g/s和0.12 mm/s。结论 C/YAG复合材料高的质量烧蚀率和线烧蚀率主要归因于氧乙炔焰高热流和强剪切力作用。烧蚀后材料的微观形貌可以分为中心区、过渡区和边缘区三个区域。其中烧蚀中心区主要受到热化学腐蚀和机械剥蚀的作用,而过渡区和边缘区主要受到热化学腐蚀和热物理侵蚀的作用。

Anti-ablation Properties of C/YAG Composite

Objective To investigate theablation properties and mechanism of C/YAG composite Methods The composite was prepared through impregnation-drying-heat treatment route with Y2O3-Al2O3 sols of high solid content as precursor and low-cost 3D carbon fiber needled felt as reinforcement. The composition and microstructure of the ablated sample were characterized with XRD and SEM, respectively. Results The linear and mass ablation rate of C/YAG composites were 0.05 g/s and 0.12 mm/s, respectively. Conclusion The high linear and mass ablation rate of C/YAG composites are mainly ascribed to the powerful shearing scouring of oxyacetylene torch in high heat flux. The microstructure of the ablated sample can be divided into three regions which are center region, transition region and border region. Thermo-chemical erosion and mechanical erosion are the main ablation behaviors in the center region; while thermo-chemical erosion and thermo-physical erosion are the main ablation behaviors in the transition region and the border region.