Lightweight Metal Foams Become Bone Hard and Explosion Proof after Being Nanocoated
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Strong enough not only for use in impact protection systems in cars, but able to absorb the shock waves produced by a detonation. Those are just some of the properties shown by the metallic foams developed by materials scientists Stefan Diebels and Anne Jung at Saarland University. Their super lightweight and extremely strong metal foams can be customized for a wide range of applications. The inspiration for the new foam system came from nature: bones. Using a patented coating process, the Saarbrücken team is able to manufacture highly stable, porous metallic foams that can be used, for example, in lightweight construction projects. The initial lattice substrate is either an aluminium or polymer foam, not dissimilar to a kitchen sponge.
The research team and the start-up company that their work has spawned (Mac Panther Materials GmbH, Bremen, Germany) will be at Hannover Messe where they will be showcasing their process from the 1st to the 5th of April at the Saarland Research and Innovation Stand (Hall 2, Stand B46)
.Material researchers Stefan Diebels (l.) And Anne Jung (r.) Are able to tailor extremely durable and airy lightweight metal foams for versatile applications. Nature’s model is the structure of bones.
His research team has found a way to significantly strengthen the lattice structure of the metal foams, producing a lightweight, extremely stable and versatile material. Diebels and materials scientist Dr. Anne Jung have developed a patented procedure for coating the individual struts that make up the open-cell interior lattice. As a result, the exterior of the foam is stronger and more stable and the structure is now able to withstand extreme loads. However, the treated foam remains amazingly light.
They are so strong that they protect not only as impact protection in the car, but also against shock waves during blasting: the material researchers Stefan Diebels (r.) And Anne Jung (l.) From the University of the Saarland are extremely resilient yet airy lightweight metal foams tailor for versatile applications.
Photo: Oliver Dietze
‘Most of the applications we focus on are generally less spectacular, such as the use of our foams in lightweight construction,’ explains Dr. Anne Jung, a senior research scientist in Diebels’ group. Dr. Jung actually completed two doctoral theses. She was awarded the German Thesis Award from the Körber Foundation for ‘the most important dissertation of the year with significant relevance for society’ for her first doctoral theses on the subject of metal foams. Many products can be made lighter and more stable by drawing inspiration from nature’s design ingenuity.
Strong enough not only for use in impact protection systems in cars, but able to absorb shock waves produced by a detonation. Stefan Diebels (right) and Anne Jung (left) at Saarland University. Their super lightweight and extremely strong metal foams can be customized for a wide range of applications.
The coating is applied in an electroplating bath. The most challenging aspect of the electroplating process was achieving a uniform coating of the ultrathin layer throughout the entire interior of the foam structure. ‘The problem’, explains Anne Jung, ‘is that the metallic foam acts as a Faraday cage.’ As the interior of the foam is surrounded by electrically conducting material, electric current and thus the coating is diverted to the exterior of the foam body and does not travel through the interior of the foam – it’s similar to what happens when lightning strikes a car. The breakthrough came when Anne Jung decided to use a special anode cage, which allows her to apply a uniform, nanocrystalline coating throughout the entire lattice network. ‘The patented method also functions on the industrial scale with foams with very large surface areas,’ adds Jung.
The Saarbrücken team has authored numerous important scientific papers in the field and is now regarded as one of the world’s leading research groups in the micromechanical characterization of these porous metal lattices. Using an array of experiments, simulations, tension and compression testing, optical microscopy and x-ray computed tomography, the research team have examined the structure, pore geometry and curvature of the struts and have shown how varying the thickness of the nanocoating can impart different properties to the foam materials.
Background
In order to facilitate the commercial and industrial application of their research results, the Saarbrücken researchers have entered into a technology transfer pilot project together with Saarland University’s Knowledge and Technology Transfer Office (KWT) and the external start-up partners Dr. Andreas Kleine and Michael Kleine, and have established the company Mac Panther Materials GmbH with headquarters in Bremen. Both Dr. Jung and Professor Diebels have a stake in the new company as does Saarland University’s knowledge and technology transfer company WuT.
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Contacts and sources:
Professor Stefan Diebels: /Anne Jung: /
Saarland University
Dr. Andreas Kleine
Source: http://www.ineffableisland.com/2019/03/lightweight-metal-foams-become-bone.html
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