摘要
以有机ZrC、ZrB2前驱体和聚碳硅烷的混合溶液为浸渍前驱体,利用聚合物浸渍裂解法(PIP)制备了C/C-ZrC-SiC-ZrB2复合材料,并对材料的微观形貌、弯曲和烧蚀性能进行了研究。研究结果表明:利用该方法可制备出陶瓷相填充充分且分布均匀的C/C-ZrC-SiC-ZrB2复合材料。材料的弯曲强度为126.31 MPa,断面有大量的纤维束拔出,表现出良好的假塑性断裂模式。经过120 s氧–乙炔烧蚀,材料无明显烧蚀,其线烧蚀率和质量烧蚀率分别为–2.50×10-4mm/s和–1.33×10-4g/s。在材料表面不同区域形成不同的保护层,不仅能够降低氧气和热流向材料内部扩散,还具有弥补缺陷的作用,使材料表现出优异的抗烧蚀性能。
C/C-ZrC-SiC-ZrB2 composites were prepared by precursor infiltration and pyrolysis （PIP） process using a mixture solution of organic ZrC, ZrB2 precursor and polycarbosilane as precursor. Microstructure, flexural property and ablation behavior of the composites were studied. The results show that the composites produced by PIP have a homogeneity distribution of ceramic phase. The flexural strength of the composites is 126.31 MPa. There are a large number of carbon fiber bundles pulled-out, and the composites exhibit a pseudo-plastic fracture behavior. After ablated for 120 s by oxyacetylene flame, the composites show no significant ablation, and their linear and mass ablation rates are-2.50×10^（-4） mm/s and-1.33×10^（-4） g/s, respectively. Different kinds of protective coatings form on the different regions of ablated surface, which can not only reduce the diffusion of oxygen and heat but also remedy defects effectively, and thereby greatly improves the ablation resistance of the composites.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第6期605-610,共6页
Journal of Inorganic Materials
基金
国家自然科学基金(910160029
50902111)~~
