摘要
本文以低密度C/C复合材料为坯体,有机锆聚合物为前驱体,采用聚合物浸渍裂解法(PIP)制备C/C-ZrC复合材料,并对其微观结构、力学性能、烧蚀性能以及烧蚀机理进行了研究。结果表明ZrC在材料内分布均匀,密度为2.05g·cm^(-3)的C/C-ZrC复合材料其弯曲强度为89.70MPa,呈脆性断裂。经氢-氧焰烧蚀150s后其线烧蚀率为-2.2×10^(-3)mm·s^(-1),质量烧蚀率为-1.0×10-3g·s^(-1),远低于密度为1.86g·cm^(-3)的C/C复合材料(线烧蚀率:4.4×10^(-3) mm·s^(-1),质量烧蚀率:7.5×10^(-4)g·s^(-1));在烧蚀的过程中,ZrC表现出优先氧化,同时生成的ZrO_2阻挡层能有效阻挡热量的传递和氧气的渗透,提高了材料的抗烧蚀性能。
C/C-ZrC composites were prepared by precursor infiltration and pyrolysis method （PIP） using organic zirconium as precursor, and low density carbon/carbon composites as performs. The microstructure, mechanical properties, ablation behavior and the anti-ablation mechanism were investigated. The results show that the ZrC phase is uniformly distributed in the materials, the flexural strength of the C/C-ZrC composites with a density of 2.05g·cm^-3 is 89.70MPa, and it belongs to the brittle fracture. The linear and mass ablation rates of C/C-ZrC composites after oxy-hydrogen flame ablation for 150s are -2.2×10^-3mm·s^-1 and -1.0×10-3g·s^-1, respectively, which is much lower than that of C/C composites （linear ablation rates： 4.4×10^-3 mm·s^-1 ; mass ablation rates： 7.5×10^-4g·s^-1 ）. ZrC exhibits preferential oxidation in the process of ablation. Meanwhile, the formation of the ZrO2 layer can effectively prohibit the heat transfer and infiltration of oxygen, and improve the anti-ablation performance of C/C.
作者
赵春晓
李红
任慕苏
张家宝
杨敏
孙晋良
ZHAO Chunxiao LI Hong YANG Min ZHANG Jiabao REN Musu SUN Jinliang(Composite Materials Research Center, Shanghai University, Shanghai 200072, Chin)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2017年第2期248-252,277,共6页
Journal of Materials Science and Engineering
