Research On Continuous Metallization Modification Of Carbon Fiber And The Performance Of Electromagnetic Shielding Of Composite Materials

Electromagnetic waves are an important way of transmitting information to humans.With the rise of electronic communication,electromagnetic waves are an irreplaceable part of modern society.In the aerospace and military fields,electromagnetic interference has always been a problem for researchers to solve,and in life,prolonged radiation can also affect people’s health,so electromagnetic shielding materials play a pivotal role.Compared with traditional electromagnetic shielding materials such as heavy metals,flexible electromagnetic shielding materials have excellent mechanical properties,flexibility,high strength,light weight,high elastic modulus and other advantages,including flexible carbon fiber-based composite materials are ideal for electromagnetic shielding materials.Flexible carbon fibers are usually combined with materials with high magnetic and electrical permeability,and complemented by polymers with enhanced mechanical strength and multifunctional properties to produce high-performance carbon fiber composites;they not only make full use of the excellent mechanical properties of carbon fibers,but also overcome the shortcomings of poor electromagnetic performance of carbon fibers when used alone;and through the synergistic mechanism of electromagnetic wave reflection and absorption,carbon fiber composites It is expected to be an efficient and"green"electromagnetic shielding material.This paper addresses the issues of the high cost of commercial shielding materials,the lack of industrial application of short fiber metallization due to its complexity and high cost,and the environmental hazards of secondary radiation caused by the electromagnetic wave reflection mechanism.This paper is based on the design of surface modification of carbon fibers and hopes to solve the problem of industrial application of metallized carbon fibers through the design of continuous fiber metallization;the preparation of carbon fiber composites with mainly absorption properties to achieve the shielding of electromagnetic waves.The paper focuses on the following:(1)Overcome the problem of poor interfacial properties and weak electrical conductivity of the original carbon fibers,which makes it difficult to achieve functional composite materials,and construct a metallic plating layer on the surface of the fibers.electrical conductivity.(2)Based on the study of monometallic plating,the metal plating was further investigated,and an alloy plating was successfully constructed on the surface of the carbon fiber,further improving the mechanical properties(tensile properties up to 3.75 GPa)and electrical properties(conductivity up to 3.87 x 10~6 S/m),enabling a wider range of applications.(3)By constructing continuous equipment,the continuous preparation of metallized fibers was achieved,solving the problems of high cost and narrow application of metallized carbon fibers,improving the uniformity and stability of the plating layer on the surface of continuous carbon fibers,and providing a basis for continuous multi-dimensional modification of the surface of carbon fibers.A continuous production rate of 50 m/day can be achieved while maintaining good plating quality during the preparation process.(4)In this paper,we have successfully prepared carbon fiber composites by weaving metallized carbon fiber fabrics on the basis of continuous metallization through a two-dimensional weaving technique to achieve homogeneous metallization of the fiber fabrics,which has improved the mechanical properties(tensile strength of 445 MPa and bending strength of551 MPa)and electromagnetic shielding properties(45 d B)of the composites and ensured the stability of the electromagnetic shielding properties.