摘要
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 （CFNR） was prepared by binding short carbon fiber （SCF） with phenolic resin （PF） and carbonizing at high temperature. The CFNR was impregnated with epoxy resin （EP） in vacuum to form high rigid CFNR/epoxy resin （EP） composites. The study was performed to explore the influences of different carbonization temperatures on the mechanical behavior of composite materials. The microstructures of CFNR and CFNR/EP were observed using scanning electron microscope, and the electrical conductivity and mechanical properties of the composites were evaluated by resistance meter and universal testing machine. The content of PyC in CFNR was analyzed by a thermogravimetric analyzer. It was found that SCF is bonded into three-dimensional net-work by PyC from the carbonization of PF. CFNR/EP composites exhibit superior performance than the short carbon fiber （SCF）/EP composite materials. With an increase of carbonization temperature, the amount of residual PyC reduced, leading to a decrease in the quantity of binding nodes in the CFNR. The bending strength, compression strength and electric conductivity were thus reduced. The bending strength of CFNR1/EP is 25% higher than that of CFNR3/EP, while the compression strength is 10% higher. The electrical conductivity of CFNR1/EP increased by four times compared with that of CFNR3/EP.
出处
《炭素技术》
北大核心
2017年第4期11-15,共5页
Carbon Techniques
基金
湖南大学汽车车身先进设计与制造国家重点实验室课题(734215002)
关键词
炭纤维网络增强体
环氧树脂
炭化温度
力学性能
导电性
Carbon fiber network reinforcement
epoxy resin
carbonization temperature
mechanical properties
electrical properties
作者简介
杨丹（1989-），女，硕士，主要从事炭纤维复合材料研究．E-mail：15700771365@139．com。
通讯作者：费又庆，博士，教授，博士生导师，研究方向为炭纤维及复合材料。E—mail：yfei@hnu．edu．cn。
