Yang Tingli, Dong Chuang, Rong Yiyang, Deng Zongyi, Li Pengfei, Han Pengkun, Shi Minxian, Huang Zhixiong
Key Lab of Advanced Technology for Specially Functional Materials, Ministry of Education, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Polymers (Basel). 2022 Jul 7;14(14):2785. doi: 10.3390/polym14142785.
Carbon fiber fabric-reinforced phenolic resin composites are widely used as thermal protection materials for thermal protection systems in hypersonic vehicles and capsules. In this work, carbon fiber fabric-reinforced boron phenolic resin composites modified with MoSi and BC were prepared via a compression molding technique. The high-temperature performance of the composites as well as the oxidation behavior of the carbon fibers was studied. The results indicate that the incorporation of BC improves the performance of composites at high temperatures. The residual weight rate of composites with 15 phr BC (BP-15) sufficiently increased from 23.03% to 32.91% compared with the composites without BC (BP-0). After being treated at 1400 °C for 15 min, the flexural strength of BP-15 increased by 17.79% compared with BP-0. Compared with BP-0, the line ablation rate and mass ablation rate of BP-15 were reduced by 53.96% and 1.56%, respectively. In addition, MoSi and BC particles had a positive effect on the oxidation of carbon fibers in the composites. After treatment at 1400 °C, the diameter of the as-received carbon fiber was reduced by 31.68%, while the diameter of the carbon fiber in BP-0 and BP-15 decreased by 15.12% and 6.14%, respectively. At high temperatures, the liquid BO from BC and MoSi-derived complex-phase ceramics (MoB, MoB, MoC, MoSiC) acted as an oxygen barrier, effectively mitigating the oxidation degree of the carbon fibers.
碳纤维织物增强酚醛树脂复合材料被广泛用作高超声速飞行器和太空舱热防护系统的热防护材料。在本工作中,通过模压成型技术制备了用MoSi和BC改性的碳纤维织物增强硼酚醛树脂复合材料。研究了复合材料的高温性能以及碳纤维的氧化行为。结果表明,BC的加入提高了复合材料在高温下的性能。与不含BC的复合材料(BP-0)相比,含15 phr BC的复合材料(BP-15)的残重率从23.03%充分提高到32.91%。在1400℃下处理15分钟后,BP-15的弯曲强度比BP-0提高了17.79%。与BP-0相比,BP-15的线烧蚀率和质量烧蚀率分别降低了53.96%和1.56%。此外,MoSi和BC颗粒对复合材料中碳纤维的氧化有积极影响。在1400℃处理后,原始碳纤维的直径减小了31.68%,而BP-0和BP-15中碳纤维的直径分别减小了15.12%和6.14%。在高温下,BC产生的液态BO和MoSi衍生的复相陶瓷(MoB、MoB、MoC、MoSiC)起到了氧阻隔层的作用,有效减轻了碳纤维的氧化程度。