竹炭/石墨/环氧树脂电磁屏蔽复合材料性能研究  

Properties of bamboo charcoal/graphite/epoxy resin electromagnetic interference shielding composite

作　　者：杨文斌[1] 文月琴[1] 宋剑斌[1] 

机构地区：[1]福建农林大学材料工程学院,福州350000

出　　处：《林业工程学报》2018年第1期65-70,共6页Journal of Forestry Engineering

基　　金：国家自然科学基金(31170535)

摘　　要：为研究天然石墨和合成石墨在不同竹炭质量分数条件下复合材料的电磁屏蔽效果,制备屏蔽效能优异的竹炭/石墨/环氧树脂电磁屏蔽复合材料,在两种石墨中分别加入不同质量分数的竹炭,通过模压固化成型制成竹炭/石墨电磁屏蔽复合材料,并对其进行力学性能、动态热机械性能、电阻率性能和电磁屏蔽效能测试及扫描电子显微镜分析。结果表明:随着竹炭质量分数的增加,逐步形成竹炭-石墨网状结构,两种复合材料的玻璃化转变温度均上升;电阻率均降低;30~1 500 MHz频率下电磁屏蔽效能均增大,竹炭质量分数为40%时,合成石墨复合材料电磁屏蔽效能最大,约为30 d B;但由于填料的团聚作用,两种复合材料的弯曲模量下降。扫描电子显微镜分析表明,合成石墨复合材料的界面结合力更好。综合分析可知,当竹炭质量分数为30%时,合成石墨复合材料的力学性能较好;竹炭质量分数增加,石墨复合材料的电磁屏蔽效能增大。bThis study investigated graphite composites with different contents of bamboo charcoal（ BC） through curing molding,and fabricated BC/graphite electromagnetic interference（ EMI） shielding composites by adding different contents of BC to the natural graphite and synthetic graphite,respectively. The mechanical performance,dynamic thermal mechanical properties,electrical resistivity,SEM,and EMI shielding effectiveness were studied. The results showed that the Tgof both natural and synthetic graphite composites increased when the BC contents increased; the electrical resistivity declined; and the EMI shielding effectiveness increased all the time. The maximum EMI shielding effectiveness reached about 30 d B when the BC content was 40 wt% of the synthetic graphene composite. However,due to the aggregation between particles,the flexural modulus of both graphene composites decreased. The results of SEManalyses showed better interface property of the synthetic graphene composites. It can be concluded that synthetic graphene composites had the better mechanical properties when the BC content was 30 wt%,and that with the increase of BC content,the EMI shielding effectiveness of graphene composites enhanced.

关 键 词：电磁屏蔽复合材料 竹炭 弯曲性能 电阻率 电磁屏蔽效能 

分 类 号：TB34[一般工业技术—材料科学与工程]