碳纤维/环氧树脂复合材料微波固化试验

Experiment Microwave Curing of Carbon Fiber/Epoxy Resin Composites

采用微波固化技术,对碳纤维/环氧树脂复合材料NOL环试样进行固化试验研究。通过开展力学性能测试、电镜扫描及CT扫描,对比分析了热固化与微波固化试样宏观力学性能及微细观形态。结果表明:微波固化与热固化的固化机理不同,微波固化提高了固化反应速率,固化周期缩短了57%;微波固化试样的拉伸强度和层间剪切强度与热固化试样基本相当,但微波固化试样力学性能离散系数更小,碳纤维表面有更多的树脂基体粘附,这是由于微波固化的选择性加热造成的;微波固化试样孔隙率为0.78%～1.05%,稍低于热固化试样。

Curing experiment was carried out on NOL rings of carbon fiber/epoxy composites by using the microwave curing technology.The mechanical properties and micro morphology of specimens with different curing methods,were analyzed.The results show that the curing mechanism of microwave curing method is different from that of thermal curing method.Microwave curing increases the curing reaction rate and shortens the curing cycle by 57%. The mechanical tensile strength and interlaminar shear strength of microwave curing specimens are similar to those of thermal cured specimens.Due to the selective heating of microwave curing,there is more resin matrix adhesion on the surface of the carbon fiber of the microwave-cured sample,which is confirmed by SEM micrographs.CT scan analysis indicates that the void content of the microwave-cured sample is 0.78% to 1.05%,which is slightly lower than the thermal-cured sample.