Is carbon fiber a composite and what is the composition

Carbon fiber is first and foremost a substance, made of carbon at a high temperature of more than 1,000 degrees in the same material as diamond.

Carbon fiber is a new type of non-metallic material, which and its composite materials have a series of excellent properties such as high specific strength, high specific mold, fatigue resistance, creep resistance, high temperature resistance, corrosion resistance, wear resistance, dimensional stability, electrical conductivity, thermal conductivity, small thermal expansion coefficient, self-lubrication and energy absorption and seismic resistance.

Another important property of carbon fiber is its low specific gravity. The specific gravity is generally around one-half, one-half of that of aluminum, and one-fifth of steel. Despite the light weight of carbon fiber, it has high strength, has a high "specific strength" (specific strength, the strength limit of the material, the unit weight of the material), its specific strength is 5 times that of steel, and the rigidity is very good.

The main use of carbon fiber is to compound with resins, metals, ceramics and other matrices to make structural materials. The comprehensive indexes of specific strength and specific modulus of carbon fiber reinforced epoxy resin composites are the highest among existing structural materials. In the field of density, stiffness, weight, fatigue characteristics and other strict requirements, in the occasion of high temperature and high chemical stability, carbon fiber composite materials are quite advantageous.

In view of the above excellent characteristics of carbon fiber, the application range of carbon fiber is becoming more and more extensive. From the 50s, it was mainly used in cutting-edge science such as rocketry, aerospace and aviation, and in the 80s, it was widely used in sports equipment, textiles, chemical machinery and medicine. At the same time, with the emergence of high-performance and ultra-high-performance carbon fiber, it is more and more widely used, such as A380, Boeing 777, and the new main battle tank of the United States, with the proportion of carbon fiber accounting for more than 15%.

At the same time, with the popularization of carbon fiber processing technology, its application scope has gradually involved civilian aspects since the 80s. So far, China's various applications account for 30% of the demand for carbon fiber rate, 10% for aviation, and 60% for industry.

Carbon fiber for sports is mainly used in golf clubs, tennis rackets, racing cars, bows and arrows, jumping poles, ice hockey sticks, yachts, rowing, gliders, human-powered aircraft, sailing masts, motorcycles and mountaineering supplies, such as trekking poles, ski poles, rock climbing helmets, etc.

In addition, it has a wide range of applications in the seismic reinforcement of buildings.

Carbon fiber itself is not a composite material, but a matrix of composite materials. Carbon fiber is a fiber made of chemical fiber and petroleum through a special process, in addition to having the same characteristics as general carbon materials, such as high temperature resistance, friction resistance, electrical conductivity, thermal conductivity, etc., it has higher strength, light weight and more corrosion resistance. Its density is less than 1 4 of steel, but its tensile strength is 7 9 of steel

The tensile elasticity is also higher than that of steel, and it is the only substance that does not lose strength in a high-temperature inert environment of more than 2000 years. It is insoluble or swollen in organic solvents, acids and alkalis, and has outstanding corrosion resistance. And it has a soft shape and can be processed into a variety of fabrics.

From the perspective of use, carbon fiber does not have the problem of corrosion and rust, and is more durable than ordinary metal. Under extreme climatic conditions, the properties of carbon fiber hardly change.

Carbon fiber is a microcrystalline graphite material obtained by carbonization and graphitization of organic fibers. The microstructure of carbon fiber is similar to artificial graphite, which is a chaotic graphite structure.

Carbon fiber is a composite material. Carbon fiber composite material is made of organic fiber through a series of heat treatment, carbon content higher than 90% inorganic high-performance fiber, is a new material with excellent mechanical properties, with the inherent characteristics of carbon materials, but also the soft processability of textile fibers, is a new generation of reinforced fiber.

Carbon fiber is soft on the outside and rigid on the inside, lighter in weight than aluminum, but higher in strength than steel, and has the characteristics of corrosion resistance and high modulus, which is an important material in the national defense and military industry and civilian use. It not only has the intrinsic properties of carbon materials, but also has the soft processability of textile fibers, and is a new generation of reinforced fibers.

Usage:

The main use of carbon fiber is to manufacture high-tech equipment such as aerospace and advanced composite materials. Carbon fiber refers to high-strength and high-modulus fibers with a carbon content of more than 90%, and its high temperature resistance ranks first among all chemical fibers. It is made of acrylic fiber and viscose fiber, which is oxidized and carbonized at high temperature, and has the characteristics of high temperature resistance, friction resistance, electrical conductivity, thermal conductivity and corrosion resistance.

Carbon fiber is a composite material.

Carbon fiber refers to high-strength and high-modulus fibers with a carbon content of more than 90%. High temperature resistance ranks first among all chemical fibers. It is made of acrylic fiber and viscose fiber, which is oxidized and carbonized at high temperature. It is an excellent material for the manufacture of high-tech equipment such as aerospace and other wild bushes.

It is mainly composed of carbon elements, with high temperature resistance, friction resistance, heat conductivity and corrosion resistance, and the shape is fibrous, soft, and can be processed into various fabrics. Carbon fiber has a low density and therefore has a high specific strength and specific modulus.

The main use of carbon fiber is as a reinforcing material to composite with resins, metals, ceramics and carbon to make advanced composite materials. The specific strength and specific modulus of carbon fiber reinforced epoxy resin composites are the highest among existing engineering materials.

Advantages and disadvantages of carbon fiber

Advantages of carbon fiber:

1. The specific gravity is light, and the density is generally, which is lighter than many metal materials.

2. High strength, can reach 1200MPa 7000MPa, which is 7-10 times that of steel with the same cross-section.

3. The elastic modulus is not usually good, reaching 200GPA 400GPA, which is similar to steel.

4. The coefficient of thermal expansion is close to zero, and can even be negative ( .

Carbon fiber disadvantages:

1. After being processed into carbon fiber products, it is brittle and easy to break. This disadvantage makes it more difficult in machining.

2. **High. Due to the complexity of his process, it generally cannot be mass-produced, so it will be more expensive.

Carbon fiber is a composite material. 。Carbon fiber is a composite material because it has both the inherent properties inherent in carbon materials and the softness and processability of textile fibers, and is a new generation of reinforcing fibers. Introduction:

1. Carbon fiber: Carbon fiber (CF for short) is a new type of fiber material with high strength and high modulus, with a carbon content of more than 95%. It is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite crystallites axially along the fibers and carbonizing and graphitizing them.

Carbon fiber is "soft on the outside and rigid on the inside", which is lighter than aluminum, but stronger than steel, and has the characteristics of corrosion resistance and high modulus. It is an important material for national defense, military industry, and civilian use. It has both the inherent properties inherent in carbon materials and the softness and processability of textile fibers, and is a new generation of reinforced fibers.

2. Composite materials: Composite materials are materials with new performance formed by combining two or more materials with different properties through physical or chemical methods. Various materials complement each other in terms of performance and produce synergistic effects, so that the comprehensive performance of composite materials is better than that of raw materials and meets various requirements.

The matrix materials of composite materials can be divided into two categories: metal and non-metal. Commonly used metal substrates are aluminum, magnesium, copper, titanium and their alloys. Non-metallic matrices mainly include synthetic resins, permeated rubber, ceramics, graphite, carbon, etc.

Reinforcement materials mainly include glass fiber, carbon fiber, boron fiber, aramid fiber, silicon carbide fiber, asbestos fiber, whisker, wire and hard particles.

Carbon fiber can be classified as a type of composite material. It is composed of carbon fiber and resin-based tan spike traces, often using epoxy as a matrix. The chemical bond strength and interaction between carbon fiber and the resin matrix are strong, so they have the characteristics of high strength, high stiffness and light weight.

In addition, the arrangement of carbon fibers allows them to be adjusted to improve their characteristics, making them widely used in high-load and high-density applications.

In the manufacturing process of carbon fiber, it weaves a group of filaments with a cross-sectional area of less than a composite cloth and wets and solidifies it with a resin matrix at high temperatures and pressures. Due to the better interlacing and easy handling of three-dimensional knitted carbon group modified fibers, they are widely used in some complex requirements of high strength and high stiffness.

Although carbon fiber is a composite material, it has a wider range of applications than other traditional composite materials. Due to its lightweight, high stiffness and high strength, carbon fiber is widely used in automobiles, aircraft, aerospace, ships, sports equipment and other fields, and has become one of the representatives of high-performance materials.