二维C/C复合材料层叠板制备工艺及其性能的研究

研究通过浸渍—炭化法制备二维C／C复合材料层叠板的工艺参数，分析了不同基体前驱体和增密次数对材料的密度、厚度和收缩率、体积电阻率和层间剪切强度的影响，并用扫描电子显微镜进行断口分析。结果表明：选用残炭率较高的基体前驱体和适当的增密次数是制备低成本二维C／C复合材料层叠板的关键；相同纤维体积的层叠板基体炭含量越高，电阻率越小，导电性能越好；单位体积含有炭纤维越多，纤维受损几率就越大，产生结构缺陷几率越高，导致电阻率增加，导电性能下降；本实验中二维C／C复合材料层叠板制备工艺简单可行，层叠板的密度达到1．40g／cm^3以上，剪切强度为1．5MPa，断口呈脆性断裂特征。

STUDY OF FABRICATION PROCESS AND PROPERTIES OF 2D-C/C COMPOSITE LAMINATES

This paper studied processing parameters of 2D-carbon/carbon composite laminates by impregnating-carbonization route,and analyzed the effect of different precursors and densification times on density,thickness and shrinkage,volume resistance and interlaminar shear strength(ILSS);and fracture morphology was further analyzed by SEM.The results showed that:Precursor with the carbon yield ratio and reasonable densification times are the keys to produce low-cost,2D-carbon/carbon composite laminates;the more matrix carbon content with the same fiber content,the smaller resistance and the better conductivity;the more carbon fiber content,the more damage of fiber and the higher structure defects,which made resistance increase and conductivity decreased;in this experiment,the fabrication process of 2D-carbon/carbon composite is simple and feasible,but the ILSS is only 1.5MPa,and the laminates present brittleness fracture.