Yancheng Xiangsheng tell you what is the difference between carbon fiber and short carbon fiber?

Carbon fiber and short carbon fiber are mainly different in the following aspects:

1. Appearance

Carbon fiber: usually presented as a continuous filamentous fiber shape, its length is longer, is generally supplied in rolls, easy to follow the textile, winding and other processing operations, can be woven into various shapes of prepreg or fabric according to different process requirements, such as common carbon fiber cloth is woven from continuous carbon fiber.

Cut carbon fiber: It is the product of continuous carbon fiber cut in accordance with a certain length, the appearance of short fiber segments, the length is generally between a few millimeters and tens of millimeters, showing dispersed short fibers, like the cut fibers will be piled together, similar to powder or short filament-like aggregation.

Second, processing characteristics

Carbon fiber:

Due to its continuous characteristics, it is more suitable for some processing processes that need to maintain the continuity of fibers, such as carbon fiber reinforced pipes, pressure vessels and other structures can be made through the winding process, and the continuous fiber filament can be wound in the circular direction or longitudinal direction, which can give full play to the advantages of high strength and high modulus of mechanical properties of carbon fiber, and achieve the overall strength of the structure.

It can also be made into carbon fiber fabric by braiding process, and then combined with matrix materials such as resin to make large composite parts such as aircraft wing skin, providing good integrity and anisotropic mechanical properties for the parts.

Cut carbon fiber:

The shape of the short fiber makes it easier to evenly disperse in the matrix material, suitable for mixing with all kinds of matrix materials (such as resin, rubber, cement, etc.), through mixing and other ways, it can be better dispersed in the matrix, and then through the molding process (such as molding, injection molding, etc.) to make the corresponding composite material products.

However, during the processing, attention should be paid to avoid fiber aggregation, otherwise it will affect its performance in the composite material, and appropriate dispersion technology and process need to be used to ensure the uniform distribution of fibers.

Third, application scenarios focus

Carbon fiber:

In the aerospace field, it is often used to manufacture the main bearing structural components of aircraft, such as wings, fuselage, etc., using its continuous fiber characteristics to achieve high strength, high stiffness and lightweight design requirements to ensure the structural safety and stable performance of aircraft during flight.

In terms of high-end sporting goods, such as the production of high-end carbon fiber bicycle frame, through the continuous carbon fiber in accordance with a specific weaving and layering method and resin composite, so that the frame can withstand a variety of complex stresses during the riding process, showing excellent mechanical properties, and the appearance is more beautiful and exquisite.

short carbon fiber:

It is often used in scenarios where it is necessary to play a strengthening role in the base material and the fiber continuity is not required. For example, in the automotive industry, the short-cut carbon fiber is added to the composite material of the car body, chassis and other components through its short fiber in the matrix

To enhance the overall strength of the material, impact resistance, etc., to achieve lightweight while improving safety.

In the field of construction, added to concrete to make carbon fiber reinforced concrete, short carbon fiber can effectively improve the crack resistance of concrete, impermeability and other properties, help to improve the durability of building structures, suitable for all kinds of key parts of the building and some construction projects in harsh environments.

Fourth, the performance of the way

Carbon fiber: relying on the continuous fiber form, it can efficiently transfer stress along the fiber axis when stressed, maximize its high strength and high modulus mechanical properties, and realize the effective support and bearing of the structure, especially in the tensile, bending and other stress states, the synergy of continuous fibers makes the overall structure have good mechanical properties.

Short carbon fiber: mainly through the uniform dispersion in the matrix material, play a similar "skeleton" role, to hinder the expansion of cracks in the matrix, improve the toughness of the matrix and other ways to improve the comprehensive performance of the composite material, its performance depends more on the interaction between the matrix material and the dispersion state and volume content in the matrix and other factors.

5. Differences in production processes

Carbon fiber: The production process mainly focuses on the precursor preparation, carbonization and other links, through the organic fiber precursor (such as polyacrylonitrile precursor, etc.) through a series of complex processes such as high temperature carbonization, removing impurities, improving crystallinity, etc., and finally forming high-performance continuous carbon fiber products, focusing on ensuring the continuity and high quality of the fiber and achieving the required strength and modulus and other performance indicators.

short carbon fiber: Is a secondary processing on the basis of continuous carbon fiber, first to select the appropriate continuous carbon fiber as a raw material, and then the use of special fiber cutting equipment (such as rotary cutter or reciprocating fiber cutting machine in mechanical cutting method, etc.) according to the set length of the cut, the subsequent may also involve surface treatment, screening and grading processes, etc. The goal is to obtain short carbon fiber products that meet specific length requirements and can be well combined with other materials.

Yancheng Xiangsheng Carbon Fiber Technology Co., Ltd. Registered trademark "Xiangli", is committed to the research of carbon fiber, aramid fiber and other special fiber composite materials functionality and design diversity, It has developed 16 series products with independent intellectual property rights, such as rotorcraft shell, landing gear, aircraft plant protection spray system, seaplane float, swamp boat, aerodynamic boat, aviation communication helmet, carbon fiber for plastic reinforcement, carbon fiber powder for friction materials, short carbon fiber for braking system, as well as carbon fiber rope, carbon fiber cloth, carbon fiber filament special fiber cutting machine.