一种碳纤维/环氧预浸料的微波固化特性及其层合板的微波固化工艺研究

Curing Behavior of a Carbon Fiber/Epoxy Prepreg and Curing Processing of Laminates with Microwave Radiation

采用差示扫描量热法(DSC)和傅里叶变换红外光谱法(FTIR)研究一种碳纤维/环氧预浸料在微波辐射下的固化特性,并对碳纤维/环氧预浸料层合板的微波固化-真空袋成型工艺中存在的真空袋易过热破损的问题进行研究。结果表明:与热固化相比,微波固化能够明显缩短固化时间,而且不会改变最终固化产物的分子结构;碳纤维/环氧预浸料的尺寸大小对其微波固化行为有一定的影响;通过控制微波功率,可以有效地解决在碳纤维/环氧复合材料微波固化过程中存在的真空袋过热破损的问题,且微波固化可获得固化时间控制在60min左右、固化度达95%以上的碳纤维/环氧复合材料层合板,微波固化时间比传统热固化(固化时间大于2h)缩短了一半以上。

The curing behavior of a carbon fiber/epoxy prepreg under microwave radiation was investi- gated using differential scanning calorimetry （DSC） and Fourier transform infrared spectroscopy （FTIR）, respectively. The carbon fiber/epoxy composite laminates were manufactured through microwave curing-vacuum bag molding process, and the existing overheating and broken issues of vacuum bags were studied. The results show that compared with thermal curing, microwave curing can significantly shorten curing time without altering molecular structure of the cured products. It seems that the size of the carbon fiber/epoxy prepreg influences its microwave curing characteristic. The problem of vacuum bag breakage, due to overheating in microwave curing of carbon fiber/epoxy composites, can be solved by controlling the microwave power, and the fabrication of the laminates with microwave radiation can be accomplished in about 60 minutes with more than 95 % curing degree, indicating that microwave processing is shortened by more than half of curing time than conventional thermal cu- ring （curing time more than 2h）.