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18th December 2017, Leudelange

Strong aluminium composite with carbon nanotubes

Professor Hansang Kwon, from Pukyong National University in South Korea, said he has developed an economically viable technology for reinforcing metal matrix composites with single wall carbon nanotubes. For this new composite material, Prof Kwon used Tuball nanotubes produced by OCSiAl, an international nanotechnology company.

He uniformly dispersed the nanotubes in aluminium, using a grinding and mixing technique to get the raw materials down to the nano scale. Tests have revealed that, compared with conventional aluminium, the composite obtained has a tensile strength four times higher and a hardness 20 times higher.

Professor Hansang Kwon, from Pukyong National University in South Korea. © OCSiAl

One of the primary applications of this nano-augmented aluminium is in high-voltage electricity cables, he explains. “The existing approach in reinforcing aluminium high-voltage electricity cables is to insert a steel cable inside of it. This dramatically increases the cable’s weight and leads to additional effort and requirements in the installation of transmission towers. Our new technology enables the number of transmission towers to be reduced, lowers the environmental damage and cuts costs,” said Prof Kwon.

The technology has already been acquired by the Korean company Total Aluminum Service, which plans to apply it in the production of high-voltage electricity cables and wires for electric vehicles.

Tuball contents, hardness and density. © OCSiAl

“The carbon nanotube-aluminium composite cable has sufficient tensile strength and weighs only one-third that of the copper used in general cables,” added Prof Kwon. The possibility to reduce the weight of metal by introducing nanotubes is blazing a trial for this technology to boost its use in mainstream engineering, such as aviation, automotive, electronics and energy. For instance, by applying single wall carbon nanotubes, Prof Kwon has also been able to reduce the weight and prolong the cycle life of steel cylinders.

Reinforcing metal composites with single wall carbon nanotubes is pushing the boundaries of metal composite applications and meets all the requirements for genuine mass technology, including simplicity of processing and economic viability. Prof Kwon has also already obtained promising results in replacing LED and HID lighting with carbon nanotube-containing metal–ceramic for rechargeable laser lighting.

www.ocsial.com

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