碳纤维三维网络体增强环氧树脂复合材料的性能

Properties of Carbon Fiber 3D Network Reinforced Epoxy Resin Composites

以酚醛树脂粘结短切碳纤维(SCF)并炭化制得碳纤维三维网络增强体(CFNR),再采用真空袋成型法浸入环氧树脂(EP)制得新型EP/CFNR复合材料。通过显微镜观察CFNR和复合材料的微观结构,采用万能试验机测试力学性能,以及用电阻仪测定导电性能等方法对复合材料进行了评价。结果表明,炭化后的酚醛树脂将SCF粘结成连续的三维网络结构,EP/CFNR复合材料中SCF间有明显可见的炭质粘结点;当SCF质量分数为7.3%时,EP/CFNR复合材料较纯EP,EP/SCF复合材料的弯曲强度分别提高33%,29%,压缩强度分别提高23%,10%,同时,其体积电阻率是EP/SCF复合材料的1/45。

3D carbon fiber network reinforcement (CFNR) was fabricated based on short carbon fibers (SCF) bonded and carbonizedwith phenolic resin. The original epoxy resin (EP)/CFNR composites were prepared by vacuum bag molding. The microstructuresof CFNR and EP/CFNR composites were examined by optical and electron microscopy. The mechanical properties andelectrical properties of the composites were evaluated by universal testing machine and DC resistance tester,respectively. The resultsindicate that the SCF are bonded into continuous 3D network by carbonised phenolic resin,and there are obvious network nodes ofcarbon-based adhesive points between SCF in EP/CFNR composites. When the SCF mass fraction is 7.3%,the bending strength ofEP/CFNR composite increase by 33% and 29% than EP/SCF composite and pure EP,the compression strength increase by 23%and 10%. Additionally,the volume electrical resistivity of EP/CFNR composite is 1/45 of the EP/SCF composite.