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用酚醛树脂(PF)黏结短切炭纤维(SCF)炭化得到炭纤维网络增强体(CFNR),真空浸胶后得到高刚性的CFNR/环氧树脂(EP)复合材料,在此基础上进一步研究了不同炭化温度对复合材料力学性能的影响。利用扫描电镜观察CFNR微观结构,用电阻仪及万能材料试验机对CFNR/EP复合材料的导电性能和力学性能进行表征,借助热重分析仪对CFNR中PF的含量进行了分析。研究发现,炭化后的PF把SCF黏结成三维网络,炭纤维网络增强体中存在明显的炭质黏结点;CFNR/EP复合材料的性能都优于短切炭纤维(SCF)/EP复合材料;随着炭化温度的升高,PF的残炭量依次递减,使得CFNR中炭质结点的量减小,弯曲和压缩强度及导电性能也随之依次下降,其中弯曲强度CFNR1/EP比CFNR3/EP高出25%,压缩强度高出10%,导电性能提高了4倍。
Carbon fiber network reinforcements (CFNR) were obtained by the carbonization of phenolic resin (PF) bonded chopped carbon fibers (SCF), and the CFNR / epoxy resin composites with high rigidity were obtained after vacuum dipped. Effect of Different Carbonization Temperatures on Mechanical Properties of Composites. The microstructure of CFNR was observed by scanning electron microscopy. The electrical conductivity and mechanical properties of CFNR / EP composites were characterized by resistance meter and universal material testing machine. The content of PF in CFNR was analyzed by thermogravimetric analyzer. The results show that the carbonized PF bonds the SCF into a three-dimensional network, and the carbon fiber network reinforcements have obvious carbonaceous bonding points. The properties of the CFNR / EP composite are better than that of the SCF / EP composite. With the increase of carbonization temperature, the amount of carbon residue in PF gradually decreases, so that the amount of carbonaceous nodes in CFNR decreases, the bending and compressive strength and conductivity decrease. The bending strength CFNR1 / EP is higher than that of CFNR3 / EP 25% higher, higher compressive strength of 10%, conductive properties increased by 4 times.