炭纤维预制体的微波加热性能及其加热机理探讨

Microwave Heating Effect and Mechanism for Carbon Fiber Preforms

通过研究微波功率、炭纤维预制体的密度和叠层层数对预制体微波加热效果的影响,分析了微波电场在预制体中的分布特点,提出了炭纤维预制体的微波加热模型,并对其损耗机制进行了探讨.结果表明:在(2450±50)MHz的微波波段,炭纤维预制体能吸收微波而加热,其损耗机制主要为偶极子极化、界面极化及电导损耗.

Carbon fiber felts with different surface characteristics, stacking numbers, bulk density were heated by microwave irradiation to study the influence of these physical properties on microwave heating effect, analyzing the electric field distributions in the microwave oven. It indicates that carbon fiber preforms can be heated by microwave in （2450±50）MHz frequency. Furthermore, models of microwave heating were developed, and mechanisms of microwave energy loss were discussed. It is deduced that there are three kinds of heating mechanisms, which are doublet polarization, interface polarization and electrical conduction dissipation, respectively.