Graphite felt is widely used as a composite conductive layer, suitable for the use of vacuum assisted resin transfer molding, infiltration resistance change process and the curing process of the system is small, in the design and forming the surface of the conductive layer, fiber layer can predict the electrical conductivity of composites. The electrical conductivity of the composite material can be changed to a specific circuit, and there is a layer sensitive area and a pressure sensitive area.
Due to the excellent mechanical properties and good electrical conductivity, graphite felt is widely used as conductive materials, electromagnetic shielding materials, fuel cell electrode materials and so on.
It can improve the connection between the resin and the fiber by using the surface felt with low surface density, and the vacuum assisted resin transfer molding can make the connection between the layers closer, which is beneficial to improve the performance of the products, with the different carbon fiber content, the trend of the current voltage curve is also different.
The graphite felt is composed of short carbon fiber and binder, which is an ordered planar structure on the macro. Because of the existence of overlapping and stacking of short cut fibers, and certain radial bending, the carbon fiber felt can be compressed. Can predict the multilayer overlap, compared with single-layer network more dense, under the pressure of (plane structure, not destroy the carbon fiber can prevent fiber breakage or fracture), network structure intensity will increase further.
The electrical conductivity of CFV/EP composites formed by VARTM is related to the density of CFV and the limit of resistivity.