涂层层数对镍粉/石墨基复合材料介电性能和吸波性能的影响  

Effect of coating layer number on dielectric properties and wave absorptionproperties of Ni powder graphite matrix composites

作　　者：师琅 姜茸凡 SHI Lang;JIANG Rongfan(Editorial Department,Xi'an Polytechnic University,Xi'an 710048,China;Apparel&Art Design College,Xi'an Polytechnic University,Xi'an 710048,China)

机构地区：[1]西安工程大学学报编辑部,西安710048 [2]西安工程大学服装与艺术设计学院,西安710048

出　　处：《现代纺织技术》2024年第3期38-44,共7页Advanced Textile Technology

基　　金：陕西省教育厅专项科研计划项目(22JK0405)。

摘　　要：为了解制备工艺对涂覆型吸波材料性能的影响,实验研究涂层层数对镍粉/石墨基复合材料的介电性能及吸波性能的影响机制。选用PU2540型聚氨酯为黏结剂,镍粉、石墨为功能粒子,涤/棉平纹织物为基布,采用纺织涂层(刮涂法)工艺制备了涂层层数不同的镍粉/石墨基涂层复合材料。测试该复合材料的介电常数(实部、虚部、损耗角正切值)和反射损耗,分析涂层层数对复合材料介电性能和吸波性能的影响。结果表明:在测试频率1^(1)000 MHz范围内,3层的镍粉/石墨基复合材料对电磁波的极化能力、损耗能力及耦合能力最强;在测试频率10~3000 MHz范围内,涂层层数2层的复合材料的吸波性能最好,反射损耗最小峰值为-26.460 dB;3种涂层层数不同的复合材料在不同频段表现出不同的吸波特性。所得结果可为开发经济实用的吸波材料提供理论参考。Graphite has good electrical conductivity,thermal conductivity and corrosion resistance,and is widely used in graphite electrodes,electromagnetic protection materials,superconducting materials and so on.To improve the wave absorbing properties of graphite-matrix composites,and analyze the effect of the coating layer number on the dielectric properties and wave absorbing properties of composites,the nickel powder graphite matrix composites were prepared and researched.The nickel powder graphite functional particles were prepared by mixing nickel powder and graphite according to the mass ratio of 1:4.By using PU2540 polyurethane as the substrate and adding appropriate thickener,the nickel powder graphite coating sizing was prepared.The mass fraction of functional particles in the coating sizing is 40%of the total mass,and the viscosity of the coating sizing is 30,000 mPa·s.With the common polyester cotton plain fabric in the market as the coating material base cloth,by adopting the textile coating process(scraping coating method)and using the automatic coating machine(coating machine speed of 60 cm min),the nickel powder graphite base coating sizing was evenly coated on the base cloth and dried in the oven at 80℃for 10 min.Nickel powder graphite based coating composites with 1,2 and 3 layers were prepared,respectively.The dielectric constant of the composite was measured by BDS50 dielectric impedance spectrometer,and the reflection loss was measured by ZNB40 vector network analyzer.The effects of the layer number on dielectric properties and wave absorption properties of the composite were analyzed.The results show that the layer number has a certain influence on the electromagnetic shielding properties of Ni powder graphite coating composites.In the applied electric field frequency range of 30~1,000 MHz,the real part of the dielectric constant of the composites with different coating layers decreases.When the frequency is 30 MHz,the real part of the dielectric constant of the samples is the largest,and the comp

关 键 词：镍粉 石墨 涂层 复合材料 介电性能 吸波性能 

分 类 号：TS101.3[轻工技术与工程—纺织工程]