碳纤维导电复合材料的电学性能研究

A Study of the Electrical Properties of Carbon Fiber Conductive Composite

研究了 FR- 4溴化环氧树脂玻璃布和碳纤维导电纸层压复合面状发热板的电学性能 ,结果表明 :溴化环氧树脂固化过程对其电性能产生影响 ,对于不同规格的导电纸 ,其电阻下降率不同。面状发热板的电阻在升温和降温过程中存在不同程度的偏离 ,呈现 PTC或 NTC效应 ,数次热循环后 ,可以使室温电阻保持恒定。发热板的电阻随通电时间的延长而逐渐下降并趋于稳定 ,通断电次数对其电阻影响不大 ,在长期通电使用下能保持其功率稳定性 ,发热板的功率密度与表面温度呈现良好的线性关系。

The electrical properties of carbon fiber facial heating sheet made of carbon fiber conductive paper laminated with FR 4 brominated epoxy prepreg glass cloth have been studied The results show that the curing of FR 4 prepreg influences the changes of electrical properties Different kinds of conductive paper samples have different decrease ratios The resistance and temperature (R T) relationship of facial heating sheet during the heating and cooling recycling process present some difference between the heating curve and the cooling curve The samples exhibit PTC or NTC effect, but the resistance at room temperature keeps stable after several times of heat treatment Resistance of facial heating sheet decreases slightly and keeps stable after use for several hours This kind of facial heating sheet has constant power under long use Power density and surface temperature curve show linear behavior