Carbon fiber, a.k.a. graphite fiber or carbon graphite, has become a firm favorite in several sectors, and for good reason. But we won’t give it all away in the intro: read on to find out what this material is, its different types, and what it’s used for.
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Carbon fiber is a fabric mat made of woven fibers and is classed as both a composite and fiber-reinforced plastic. It’s 90% polyacrylonitrile (the carbon precursor) and 10% other precursors, like pitch or cellulose. This material is made by carbonization, oxidation, or graphitization. It’s first cut into the required shape, impregnated with resin, then processed in one of the aforementioned methods. When cured, the result is a lightweight and incredibly strong material with an impressive strength-to-weight ratio.
This type of fiber’s high heat tolerance was what inspired Sir Joseph Wilson Swan to use it for an incandescent lightbulb in . Back then, carbon fiber filaments weren’t as strong as they are now, so when tungsten came onto the scene, it pretty much took over in the lightbulb-making department. More than 50 years went by without carbon fiber being really used for anything, but a stronger version was brought out in the s, and Rolls-Royce snapped it up for its jet engines—despite the brittleness thing.
The carbon fiber that’s used in manufacturing today has a tensile strength of around 4,000 MPa and a high modulus of 400 GPa, making it useful for a whole host of things (not just bulbs). It’s resistant to creep, fatigue, chemicals, and corrosion, as well as nonflammable and nontoxic. With the right treatment, it can be electrically conductive.
This material is infamously expensive. It’s both lighter and stronger than steel, but its high cost puts manufacturers off from using it unless absolutely necessary (kind of like that pricey fragrance you’re saving for special occasions). But now the price of carbon fiber has gone down, and its usage up! Carbon fiber’s days of waiting for high-profile tasks are over; it’s now made into tools and fixings, springs and wires, and can even be used to reinforce tires.
Carbon fiber can also be referred to as graphite fiber or carbon graphite. It may be referred to under the umbrella terms composite or fiber-reinforced plastic. The term composite is used to describe a material that has a matrix and reinforcement. In the case of carbon fiber, the fiber is the reinforcement and the resin is the matrix. Fiber-reinforced plastic is used to describe glass fiber and aramid composites as well as carbon fiber.
Carbon fibers were first created in by Sir Joseph Wilson Swan for use in an incandescent lightbulb as these fibers had a very high heat tolerance. However, carbon fiber filaments at the time were not very strong. So when tungsten started being used in lightbulbs, carbon fiber had no use for over 50 years. Then, in the s, stronger carbon fibers could be produced for use in jet engines by Rolls-Royce. However, due to the brittle properties of carbon fiber, its use was limited for a long time. Since then, carbon fiber production has become much more effective. Carbon fiber today has a tensile strength in the range of 4,000 MPa and a modulus of 400 GPa which has opened up many more applications for its use.
The oxidization, carbonization, and graphitization of the carbon precursor polyacrylonitrile make up 90% of carbon fiber material. The other 10% of precursors used are either from pitch or cellulose.
The non-mechanical properties of carbon fiber are:
The mechanical properties of carbon fiber include:
The number of times a fiber goes over and under other fibers is known as the crimp, and the higher the crimp, generally, the higher its stability. But high-crimp carbon fiber means the material won’t be very flexible (known as its drapability) to form intricate shapes or geometry.
Carbon fiber is categorized into: standard, intermediate, high, and ultra-high modulus quality and ranges from 3.55 GPa of tensile strength.
No, carbon fiber is not heavy. Carbon fiber is very lightweight which is one of its two most desired properties, the other being its strength. The weight of carbon fiber will depend on the number of fibers per cm2 and the resin used to bind it. As an example, a plain twill weave of carbon fiber without resin will weigh 210 g/m2, with a thickness of only 0.28 mm. For comparison, steel has a weight of 4 kg/m2 for a thickness of 0.5 mm.
The chemical properties of carbon fiber are:
Because of its high price tag, carbon fiber is currently only used in high-performance applications, a few of which we list below.
Its low weight makes carbon fiber suitable for aircraft fuselage, empennage, nose cones, and rotor blades. When these parts are made from this material, aircraft weight can be reduced by up to 20%, something that saves millions of dollars in fuel.
It’s used to make lighter, stronger, and faster-moving tennis rackets, skis, snowboards, bikes, and golf clubs. Just be prepared to pay a lot more for carbon fiber sports equipment.
X-ray devices and implants are made from carbon fiber mainly because it is radiolucent (X-rays can pass through it easily). It’s also wear-resistant and has a similar stiffness to human bone. Unlike the metal used in some implants, carbon fiber is brittle and could shatter.
Plans for carbon fiber battery storage systems are in the works, which could greatly reduce the weight of electric cars.
Carbon fiber is becoming increasingly popular in bridges and concrete structures where strength is more important than weight. Because it can be up to ten times stronger than steel, it’s preferred, but as we’ve established, it’s much more expensive to use.
As carbon fiber’s price is on the decline, it’s starting to replace the use of fiberglass in yachts and small boats.
Drones, helicopters, jets, and transport aircraft can all be made using this material. The design of helmets has become much more complex over the years—something that also makes them heavier. Carbon fiber is here to save the day (but there’s still the issue of difficulty detecting damage).
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One downside, though, is something called Barely Visible Impact Damage. Basically, it’s hard to spot damage on this material with the naked eye, so checking for faults needs extensive training and testing. This factor affects most of the above industries, but especially aerospace, energy, marine, and military.
Carbon fiber is compatible with 3D printing. It can either be used as a continuous fiber layer or printed as short strands in the filament of an FDM (Fused Deposition Modeling) printer. The printer will need two printheads if you are to print with a continuous fiber: one for the plastic filament and one for the carbon fiber. If you choose to embed chopped strands within the filament, you can improve the strength and stiffness of printed parts without going bankrupt. Using this material in 3D printing means you can make parts that can be used for structural purposes because they’re way stronger than the typical PLA and ABS used in 3D printing. With carbon fiber, parts can be compared in strength to materials like aluminum.
The aerospace industry is using 3D-printed carbon fiber parts to some extent. Because of safety regulations, any new technology or materials need to undergo extensive testing and qualification before being used in aerospace, but for now, it’s not uncommon to find parts for brackets and specialized tooling made from 3D-printed carbon fiber. Companies don’t have to deal with huge lead times, either.
Did you know carbon fiber is five times stronger than steel? Carbon fibers make up more than 90% carbon content. It is mainly known for its’ high tensile strength, high stiffness, and low density.
Due to its high strength and density, carbon fiber sheets have a wide variety of uses in the manufacturing world. It’s an ideal manufacturing product. So, what are some of the carbon fiber applications that utilize these properties?
Keep reading to learn five major manufacturing uses of carbon fibers.
Carbon fiber’s strength and durability make them valuable in the automotive industry. Therefore, car manufacturers use it in the construction of vehicle frames.
Mostly used on luxury cars such as the Mercedes-Benz. For instance, carbon fiber reduces vehicle weight by removing unnecessary metal pieces. This reduces fuel consumption and CO2 emissions.
Carbon fiber also makes vehicle manufacturing cheaper. Other materials like aluminum would significantly increase the production costs.
Designers can create new shapes and models using carbon fiber. This allows them to make innovative and functional decor items like watches.
Its strength makes it ideal for kitchen utensils and furniture elements.
Carbon fiber sheets are commonly used for making picture frames and light fixtures. The material has a unique look compared to other materials. It gives a modern, futuristic feel to rooms, without the harshness metal or glass brings.
Many professional athletes use carbon fiber sheet in their sporting equipment. This includes helmets, golf clubs, bicycle frames, bicycle wheels, and others.
Carbon fiber application in sports is due to its lightweight.
It is lighter than metal, plastic, and wood. This makes it easier for athletes to carry their equipment. Athletes can therefore run faster, and swim farther.
Powered by carbon fiber, faster and stronger tennis racquets were made in .
Carbon fiber is widely used in the aircraft industry. The first successful use of carbon fiber in an aircraft was in . This was done by Lockheed Corporation, who created a new model of the P-38 fighter plane.
In recent years, carbon fiber has reduced the weight of airplanes.
Military-grade armor such as ballistic shields and armor use carbon fiber for production. They reinforce high-strength parts such as struts, doors, and cabins.
The US Department of Defense (DOD) has been using it for decades. When creating guns or knifes out of carbon fiber, they cut the desired shape out of the carbon sheet. The edges are then smoothed down to ensure safety and fit together nicely.
Finally, pieces are placed into the oven and baked at high temperatures until cured. Therefore, resulting with strong, lightweight pieces of equipment ready to be used.
Manufacturers and entrepreneurs continue to research resourceful ways to use carbon fiber sheets. Rapid technological advancements will make it possible.
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