In this blog post, we’ll take an in-depth look at the structure and properties of carbon fiber, the principles behind carbon fiber-reinforced plastic (CFRP), its applications across various industries, and its future prospects.
The Rise of Carbon Fiber-Reinforced Plastic
In the automotive industry, a new material is rapidly gaining traction as a replacement for steel, which has long been the primary material for vehicle bodies. While car bodies were traditionally made mostly of steel, various composite materials are now being used to reduce weight while maintaining high strength. A prime example of this is plastic. Conventional plastics are known to have lower strength than steel and to be vulnerable to impact, making them unsuitable for use in automotive bodies. However, plastics reinforced with carbon fiber (CF) exhibit properties entirely different from those of ordinary plastics. Plastics reinforced with carbon fiber possess extremely high strength and outstanding rigidity while significantly reducing weight, making them a core material in various high-tech industries such as the automotive and aerospace sectors. So, what kind of material is carbon fiber that delivers performance superior to that of steel?
What Is Carbon Fiber?
The potential of carbon fiber first came to light about 100 years ago when inventor Edison carbonized bamboo fibers to use as filaments in light bulbs. Subsequently, modern carbon fiber began to be widely utilized in industry in the latter half of the 20th century as manufacturing technologies advanced.
As the name suggests, carbon fiber is an extremely fine fiber composed mostly of carbon. While its appearance is similar to that of ordinary fibers, its internal structure is entirely different. Carbon atoms are arranged in a regular hexagonal lattice, giving the material extremely high strength and stiffness. Furthermore, because it is very lightweight yet possesses outstanding tensile strength, it is utilized in a wide range of high-tech industries.
Examining the structure of carbon fiber reveals that carbon atoms form a regular crystalline structure, which is the source of its excellent mechanical properties. Thanks to this unique structure, carbon fiber is recognized as a material that combines high strength with superior durability.
How does carbon fiber reinforce materials?
The most significant characteristic of carbon fiber is that it is incorporated into other materials to significantly increase their strength. This principle is very similar to that of reinforced concrete, which is widely used in construction.
Reinforced concrete compensates for the concrete’s weakness in tension by embedding steel reinforcing bars within it, as concrete is strong in compression but weak in tension. Carbon fiber operates on a similar principle, being incorporated into various materials to enhance their mechanical performance.
In the case of plastics, carbon fiber is arranged in a specific orientation or inserted in a woven form during the manufacturing process and then bonded with resin to create a composite material. The material produced in this way is called carbon fiber-reinforced plastic (CFRP). Since carbon fiber effectively distributes loads while compensating for the weaknesses of plastic, the resulting material possesses much higher strength and stiffness than ordinary plastic.
Applications of Carbon Fiber-Reinforced Plastics
A prime example is the automotive industry. Because carbon fiber-reinforced plastics are much lighter than steel yet maintain high strength, they significantly help improve a vehicle’s fuel efficiency and electric range while enhancing driving performance.
In fact, the German automaker BMW actively incorporated carbon fiber-reinforced plastic into the passenger compartment structure of its i3 electric vehicle. Since electric vehicles have heavy batteries, it is crucial to make the vehicle body as light as possible. At the same time, high-strength materials are necessary to ensure crash safety. Carbon fiber-reinforced plastic was the material that met these requirements.
Carbon fiber-reinforced plastic is used not only in the automotive industry but also in various other industrial sectors.
In the aerospace industry, carbon fiber composites are applied to various structural components—such as the fuselage, wings, and tail—contributing significantly to aircraft weight reduction and fuel savings. In many modern commercial aircraft, a significant portion of the airframe structure is now manufactured from composite materials.
In the wind power sector, it is used to manufacture the blades of large wind turbines. Because the blades are extremely long, they must be lightweight while maintaining high rigidity, and carbon fiber is a prime example of a material that meets these conditions.
In the aerospace industry, it is used as a structural material for rockets and satellites, helping to reduce weight while withstanding the immense loads generated during launch.
Carbon fiber-reinforced plastics can also be easily found in our daily lives. They are used in a wide range of recreational and sports equipment, such as bicycle frames, golf clubs, fishing rods, tennis rackets, skis, drones, and camera tripods, and their high strength and light weight significantly contribute to improved performance.
The Future of the Carbon Fiber Industry
Demand for carbon fiber-reinforced plastics is expected to continue growing steadily. This is because the demand for lightweight, strong materials continues to rise due to the expansion of electric and hydrogen vehicles, the growth of the aerospace industry, the expansion of renewable energy infrastructure, Urban Air Mobility (UAM), and the development of next-generation mobility industries.
South Korea is also fostering the carbon materials industry as one of its future growth sectors, and various research and development initiatives and corporate support policies are being implemented, including the carbon materials industry cluster centered in Jeonju, Jeonbuk Special Self-Governing Province. Furthermore, efforts to localize carbon fiber production and develop composite materials technology are ongoing.
However, carbon fiber-reinforced plastics face challenges such as high manufacturing costs, complex processing, and recycling technologies that have not yet fully matured. Recently, efforts to streamline manufacturing processes and develop recycling technologies have been actively underway, and as these technologies advance, the range of applications is expected to expand further.
Lighter than steel and possessing superior strength, carbon fiber-reinforced plastics are no longer specialized materials used only in select high-tech industries. Their scope of application is rapidly expanding across all aspects of our daily lives and industries—including automobiles, aircraft, wind power generation, aerospace, and sports equipment—and they are establishing themselves as a core material that will lead the future of eco-friendly mobility and advanced manufacturing industries.
