碳纤维/氮化硅复合陶瓷的制备及其电磁屏蔽性能研究  

Preparation and Electromagnetic Shielding Properties of Carbon Fiber/Silicon Nitride Composite Ceramics

作　　者：黄浩 王鲁杰[1,3,4] 齐倩 汤华国 李彤阳 于源 孙海清[2] 乔竹辉 HUANG Hao;WANG Lujie;QI Qian;TANG Huaguo;LI Tongyang;YU Yuan;SUN Haiqing;QIAO Zhuhui(State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China;School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,Shandong,China;Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing,Yantai 264006,Shandong,China;Qingdao Center of Resource Chemistry&New Materials,Qingdao 266000,Shandong,China)

机构地区：[1]中国科学院兰州化学物理研究所,甘肃兰州73000 [2]山东科技大学,山东青岛266590 [3]烟台先进材料与绿色制造山东省实验室,山东烟台264006 [4]青岛资源化学与新材料研究中心,山东青岛266000

出　　处：《陶瓷学报》2024年第4期750-759,共10页Journal of Ceramics

基　　金：国家重点研发计划(2022YFB3706204);山东省自然科学基金(ZR2020ZD29,ZR2021JQ20);山东省实验室(SYS202204);甘肃省青年科学基金(23JRRA598);山东省泰山学者计划。

摘　　要：优异的电磁屏蔽材料是保护人体健康和仪器设备正常工作必不可少的选择。通过放电等离子烧结制备含碳纤维的氮化硅基陶瓷,具备着良好电磁屏蔽性能的同时,也保持着一定的机械强度。首先,碳纤维的引入导致复合陶瓷的介电常数增加,样品表面阻抗失配增强,大部分电磁波被反射。其次,高含量碳纤维的加入,在氮化硅基体中形成完整的三维导电网络骨架,复合陶瓷的电导率最高达到2.15 S·m^(-1)。入射至样品内部的电磁波被导电骨架形成的介电损耗所吸收。最后,加入7 wt.%碳纤维后,复合陶瓷的维氏硬度、断裂韧性和电磁屏蔽效能分别达到11.90 GPa、6.05 MPa·m^(1/2)和46 dB。Excellent electromagnetic shielding materials is the best choice to protect human health and maintain the normal operation of instruments and equipment.Silicon nitride-based ceramics containing carbon fibers,with high electrical conductivity and strong electromagnetic shielding performance,were prepared by using spark plasma sintering(SPS).Firstly,the introduction of carbon fiber led to an increase in the dielectric constant of the composite ceramics,the impedance mismatch of the sample surface was increased,so that more the electromagnetic waves were reflected.Secondly,since high content carbon fiber was introduced,a relatively complete three-dimensional conductive network was formed in the silicon nitride matrix,leading to a conductivity of 2.15 S·m^(-1).The incident electromagnetic wave is absorbed due to the dielectric loss of the materials.Finally,when 7 wt.%carbon fiber was introduced,Vickers hardness,fracture toughness and electromagnetic shielding effectiveness of the composite ceramics reached 11.90 GPa,6.05 MPa·m^(1/2)and 46 dB,respectively.

关 键 词：碳纤维 氮化硅 电导率 电磁屏蔽 

分 类 号：TQ174.75[化学工程—陶瓷工业]