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2009-04-25 08:00:00

Is carbon fiber a composite material

Carbon fiber is a composite material.

Carbon fiber is a composite material.

Because carbon fiber not only has the inherent intrinsic characteristics of carbon materials, but also the soft processability of textile fibers, it is a new generation of reinforced fibers, so it is a composite material.


First, carbon fiber:

Carbon fiber (abbreviated as CF) is a new type of fiber material containing high-strength and high-modulus fibers with a carbon content of 95% or more. It is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite microcrystals along the axial direction of the fiber, and carbonization and graphitization. Carbon fiber "soft inside and outside" is lighter than metal aluminum, but its strength is higher than that of steel, and it is characterized by corrosion resistance and high modulus. It is an important material in the defense industry and civilian use. It not only has the inherent intrinsic characteristics of carbon materials, but also has the soft processability of textile fibers. It is a new generation of reinforcing fibers.

Second, composite materials:

Composite materials are materials that have new properties on the macroscopic (microscopic) surface by two or more different materials, either physically or chemically. The various materials complement each other in performance, resulting in a synergistic effect, so that the overall performance of the composite material is better than the original composition material to meet a variety of different requirements. The matrix material of composite materials is divided into two major categories, metal and non-metal. Aluminum, magnesium, copper, titanium and their alloys are commonly used for metal substrates. Non-metallic substrates include synthetic resins, rubber, ceramics, graphite, and carbon. Reinforcing materials include glass fibers, carbon fibers, boron fibers, aramid fibers, silicon carbide fibers, asbestos fibers, whiskers, metal wires, and hard fine particles.

Carbon fiber has many excellent properties, carbon fiber has high axial strength and modulus, low density, high specific performance, no creep, high temperature resistance in non-oxidizing environment, good fatigue resistance, specific heat and conductivity between non-metallic and Metals have small thermal expansion coefficient and anisotropy, good corrosion resistance, and good X-ray transmission. Good electrical and thermal conductivity, good electromagnetic shielding, etc.

Compared with traditional glass fiber, Young's modulus is more than three times that of carbon fiber. Compared with Kevlar fiber, Young's modulus is about twice that of carbon fiber, and it is insoluble in organic solvents, acids, and alkalis. Excellent corrosion resistance.


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