三维中空复合材料的电性能研究

为研究三维中空复合材料电性能及力学性能,采用真空导流工艺制备了三种不同高度的三维中空复合材料,采用谐振腔法研究了三种复合材料的相对介电常数(εr)、损耗角正切值(tanδ),并测试了其在1~12 GHz频带下的透波性能,同时对三种复合材料的平压强度和平拉强度进行了研究测试。研究表明:三维中空复合材料随着厚度的增加,其相对介电常数和损耗角正切值不断减小,5 mm、6 mm和8 mm三维中空复合材料的相对介电常数分别为1.93、1.77和1.62,损耗角正切值分别为0.0083、0.0078和0.0065;透波测试表明,在1~12 GHz频带下,三种材料的透波性能均小于0.2 d B;并且三维中空复合材料平压强度和平拉强度随织物高度的增加而降低,5 mm、6 mm和8 mm试样平压强度分别为5.8 MPa、4.6 MPa和3.8 MPa,平拉强度分别为7.8 MPa、6.4 MPa和5.2 MPa。以上研究说明三维中空复合材料具有优异的电性能和力学性能。

THE STUDY OF ELECTRICAL AND MECHANICAL PROPERTIES OF 3D COMPOSITES

For studying the electrical and mechanical properties of 3D composites,three kinds of 3D composites were prepared via vacuum assistant resin infusion process (VARI).Their permittivity (εr) and loss angle tangent (tanδ) were tested by resonance cavity perturbation method.In addition,their transmission coefficient,flatwise tension strength and flatwise compression properties were investigated.The results of experiments have shown that with the increase of thickness,the εr and tanδ decrease.The permittivity of 5 mm,6 mm and 8 mm are 1.93,1.77 and 1.62,and the loss angle tangent of 5 mm,6 mm and 8 mm are 0.0083,0.0078 and 0.0065.Besides,their transmission coefficients are all below 0.2 dB between 1 GHz and 12 GHz.What's more,the results indicate that the compression strengths of the 5 mm,6 mm and 8 mm are 5.8 MPa,4.6 MPa and 3.8 MPa,respectively.The flatwise tension strengths of the 5 mm,6 mm and 8 mm are 7.8 MPa,6.4 MPa and 5.2 MPa,respectively,which indicates that the 3D composites have excellent mechanical properties.