纳米粒子原位杂化酚醛/炭纤维烧蚀防热研究

Studies on ablative and heat-resistant properties of in-situ nano-hybrid PF/CF composite

采用原位杂化方法分别制备了SiC、SiO2和Al2O3 3种纳米粒子杂化酚醛树脂,扫描电镜观察发现,纳米粒子均匀分散在酚醛树脂中,与酚醛树脂形成"海-岛"结构;热重分析结果显示,纳米粒子杂化酚醛树脂的降解过程分为3个阶段,通过Kissinger法对杂化酚醛树脂热分解活化能进行计算,发现纳米粒子能够降低树脂第1阶段的热分解活化能,而提高了树脂在第2阶段的热分解活化能;磨耗性能测试显示纳米粒子可提高酚醛树脂/炭纤维耐磨性能;氧-乙炔烧蚀法测试表明,纳米粒子能提高酚醛树脂/炭纤维复合材料的耐烧蚀性能。

SiC,SiO2 and Al2O3 three nano-hybrid phenol formaldehyde resin（PF） were prepared by in-situ hybridization method,respectively.Scanning electron microscopy（SEM） observation showed that nanoparticles dispersed well in the composite and formed the ＂sea-island＂ structure with PF.Thermal gravity analysis（TG-DTG） demonstrated three stages in the process of PF thermal degradation,and the calculated results by Kissinger method illustrated that nanoparticles can reduce the thermal decomposition activation energy at the first stage and increase it at the second stage.Wear tests explained that nanoparticles can increase PF reinforced carbon fiber（CF） composite wear property.Oxygen-acetylene ablation tests indicated that nanoparticles can increase the ablative resistance of PF/CF composite.