【摘要】 针对碳纤维复合材料层间性能较差、易发生分层损伤的问题，提出一种采用SiC粒子和热塑性共聚酰胺（PA）无纺布对碳纤维/环氧树脂基复合材料（CFRP）进行增韧改性的技术，在层间构筑一种“无机颗粒/热塑性纤维/树脂基体”多组分多尺度增韧相体系，对比分析改性前后复合材料的Ⅰ型、Ⅱ型层间断裂韧性和耐热性，借助扫描电子显微镜（SEM）和动态热机械分析仪揭示其增韧和耐热性机制。结果表明，与未改性的CFRP材料相比，当SiC填充量（质量分数）为1%、PA无纺布面密度为25 g/m²时，改性CFRP材料Ⅰ型层间断裂韧性(G_ⅠC)和Ⅱ型层间断裂韧性(G_ⅡC)分别提高了52.7%和222.6%。无机粒子的阻滞效应、纤维的桥连效应和基体树脂的塑性变形是其主要增韧机制。更多还原

【Abstract】 In response to the issues of poor interlaminar properties and susceptibility to delamination damage in carbon fiber composites, a technology for toughening and modifying carbon fiber/epoxy resin matrix composites(CFRP) using SiC particles and thermoplastic copolyamide(PA) non-woven fabric was proposed. It constructed a multi-component and multi-scale toughening system of inorganic particles/thermoplastic fiber/resin matrix within the interlayers. The interlaminar fracture toughness as well as the thermal resistance of the composite materials before and after modification of Mode-I and Mode-II were compared and analyzed. The mechanisms of toughening and heat resistance were revealed with the help of scanning electron microscopy(SEM) and dynamic thermomechanical analysis. The results showed that compared with the unmodified CFRP materials, when the SiC filling content(by mass fraction) was 1% and the PA non-woven fabric areal density was 25 g/m2, the Mode-I interlaminar fracture toughness(GIC) and Mode-II interlaminar fracture toughness(GIIC) of the modified CFRP material increased by 52.7% and 222.6%, respectively. The retardation effect of inorganic particles, the bridging effect of fibers and the plastic deformation of matrix resins are the main toughening mechanisms.更多还原