What is Carbon Fiber Material
I. The Concept of Carbon Fiber
Carbon fiber materials mainly refer to high-modulus and high-strength fibers with a carbon content of over 90%.
Carbon fiber is primarily composed of carbon elements. Its density is extremely low, while its strength and modulus are very high. With a diameter of only 5 microns, its strength exceeds that of aluminum alloy by more than four times.
II. The Development History of Carbon Fiber Materials
The development history of carbon fiber materials can be traced back to 1897 when Edison first produced carbon fiber, marking the initial development of carbon fiber.
By 1969, Japan’s Koryo Corporation launched high-performance carbon fiber products to the market, achieving a breakthrough. In 1982, companies in many countries successively produced carbon fiber products with high performance, high strength, and high modulus, advancing carbon fiber into a new high-level development stage.
III. The Characteristics of Carbon Fiber Materials
Physical Properties:
Carbon fiber is much lighter—about half the weight of aluminum or just one-fifth that of steel—so it helps you save a lot of weight.
High Strength: The tensile strength of carbon fiber is 5 to 10 times that of steel, making it the preferred material for load-bearing structures.
High Modulus: The elastic modulus of carbon fiber is relatively high, which can increase the joint stiffness of a robotic arm by 200%.
Chemical Properties:
Heat Resistance and Thermal Stability: It maintains good stability within the range of -180°C to 350°C, allowing aerospace components to withstand space environments.
Corrosion Resistance: Carbon fiber is inert to chemical substances such as alkalis, acids, and salts.
Carbon Fiber Material Characteristics Parameter Table
I. Physical Performance Parameters
| Parameter Category | Specific Index | Application Advantages |
| Density | 1.7-1.9 g/cm³ (approximately 1/2 of aluminum, 1/5 of steel) | Lightweight design, significantly reducing structural weight, suitable for aerospace, automotive manufacturing, and other weight-sensitive fields. |
| Tensile Strength | 3000-7000 MPa (5-10 times that of steel) | High-strength load-bearing capacity, commonly used in manufacturing load-bearing structures (e.g., aerospace composite components, sports equipment). |
| Elastic Modulus | 230-700 GPa (can increase the joint stiffness of robotic arms by 200%) | High stiffness, enhancing structural stability, suitable for precision machinery, robotics, and high-end equipment manufacturing. |
II. Chemical Performance Parameters
III. Comparison of Typical Parameters for Common Carbon Fiber Types in the Industry
| Carbon Fiber Type | Tensile Strength (MPa) | Elastic Modulus (GPa) | Density (g/cm³) | Main Application Fields |
| T300 Grade | ≥3530 | ≥230 | 1.76 | Common composites, sports goods (e.g., bicycle frames) |
| T700 Grade | ≥4900 | ≥230 | 1.80 | Aerospace structural components, high-end automotive parts |
| T800 Grade | ≥5490 | ≥290 | 1.81 | Advanced composites, lightweight components for spacecraft |
| M40 Grade (High Modulus) | ≥2940 | ≥400 | 1.84 | High-precision components such as satellite antennas and radar domes |
IV. Components of Carbon Fiber
Carbon fiber is mainly composed of pure carbon elements.
Its raw materials are primarily three types of organic fibers: asphalt-based fibers, polyacrylonitrile-based fibers, and viscose-based fibers, formed through high-temperature oxidation and carbonization.
It is an excellent material for manufacturing high-tech equipment such as aerospace components.
V. The Uses of Carbon Fiber
With its characteristics of high strength, high performance, high modulus, and low density, carbon fiber has been widely applied in multiple fields and shows great potential in emerging industries like robotics, including:
Aerospace Field: Used to make components such as aircraft fuselages and wings.
Medical Field: Carbon fiber medical plates and testing equipment.
New Energy Vehicle Field: Car bodies, bicycle frames, and battery casings.
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