Researchers have been successful in 3D printing ca

2022-06-10
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Researchers have achieved success in 3D printing of carbon fibers

researchers at Lawrence Livermore National Laboratory (LLNL) are confident that they have made significant progress in developing micro extrusion 3D printing technology for carbon fibers

the study was published in scientific reports

Jim Lewicki, chief researcher of LLNL and lead author of the paper, said that with 3D printing, you can make anything made of carbon fiber

the traditional manufacturing methods of carbon fiber composites are mainly one of the following two kinds: winding the filament on the mandrel or weaving the fibers together like a wicker basket

these two methods limit the final product to planar or cylindrical shape

for performance reasons, manufacturers also tend to over supplement materials, resulting in heavier, more expensive and more wasteful parts than needed

however, LLNL researchers have printed several complex three-dimensional structures by using an improved direct jet writing ("DIW") 3D printing process

Lewicki and his team also developed and patented a new chemical that can cure materials in seconds rather than hours

at the same time, the research team also developed an accurate model of carbon fiber filament flow by using the computing power of the laboratory

through optimization design and simulation, they broke through the obstacles. With their computational models, they succeeded in large parts

a team of engineers completed the calculation model on the supercomputer of LLNL. In the process, they need to simulate thousands of carbon fibers to find the best way to arrange them when they come out of the nozzle

they developed a digital code to simulate a non-Newtonian fluid polymer resin with dispersed carbon fibers

using this code, they can simulate the evolution of three-dimensional fiber orientation under different printing conditions

yuliya kanarska, a fluid analyst at LLNL, said, "we can find the best fiber length and best performance, but this is still an ongoing work. By applying magnetic force to stabilize the fibers, we are trying to achieve better fiber arrangement."

the ability of 3D printing can provide new degrees of freedom for carbon fibers, which allows them to control the microstructure of components, the researchers said

this material is also conductive, allowing directional heat conduction in a structure

the researchers said that this synthetic material can be used to make high-performance aircraft wings, one side insulation and do not need to spin in space. 2. Accuracy level: satellite components with rotation of 0.5, or

wearable devices that can absorb heat from the body but do not allow heat to enter

a major breakthrough in this technology is the use of custom-made carbon fiber filled inkjet developed from thermosetting matrix materials

Eric duoss, senior manufacturing researcher at

LLNL, "For example, for our printers 2) epoxy resin and cyanate ester resin carefully designed according to the shape technology of sample clamping end also provide higher mechanical and thermal properties compared with the corresponding thermoplastic plastics found in some commercial fields that can be used for carbon fiber 3D printing technology, such as nylon and ABS. This progress will be widely used in aerospace, transportation and national defense."

this direct inkjet writing process also makes it possible to print parts with "all carbon fibers have the same orientation in the microstructure", which makes them superior to similar materials created by other methods of random arrangement

the researchers say that using this process, they can obtain the same material properties from the final part with only two-thirds of a small amount of fiber

next, researchers will optimize the process and find the best place to lay carbon fiber to obtain the best performance

they also held discussions with partners in business, aerospace and defense to promote the future development of this technology

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