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HANNOVER MESSE 2020, 20. - 24. April

Aussteller-Pressemitteilungen

Christian-Albrechts-Universität

Welding and gluing techniques are still the main methods for permanently joining metals together. But this elaborate procedure at high temperatures pushes plastics and sensitive metals to their limits. A research team from Kiel University (CAU) and Phi-Stone AG is working on a gentle joining technique. They have used a special etching process to permanently join aluminium and plastic together, among others. Combinations with steel, light alloys such as magnesium or light composites from fibreglass reinforced or carbon-fibre reinforced plastics are now also possible. At the CAU booth at the Hannover Messe (Hall 2, booth C07), they are presenting the portable application of the process as well as how it can be integrated into existing plant technology. Potential areas of application include the automobile industry, ship-building, aviation or trade/craft. Not all metals can be welded together or glued to a plastic. Thin materials often cannot withstand the high temperatures, coatings are destroyed or other materials close to the welded seam are damaged. The method, which Professor Rainer Adelung’s CAU working group developed together with the university’s start-up Phi-Stone, can be used to permanently join both metals to metals as well as metals to plastics, at room temperature and in just a few minutes via micro-inter-locking. “There are masses of rivets in an aeroplane’s window frames, for example. Altogether they are quite heavy. But the materials used in the plane’s body cannot be joined by welding. Using our technique, you could join the metals and plastics together without needing rivets - saving up weight and also fuel,” emphasised Professor Rainer Adelung, head of the Functional Nanomaterials working group to describe the method’s potential. Interlocking structured surface With so-called “nanoscale sculpturing”, the surface of a metal is precisely roughened using an electro-chemical etching process, so that a fine, rectangular hook structure is created at the micrometre level. When two of these treated surfaces are inter-locked, a strong bond is created which is very difficult to break. Whereas the glue needs to be applied to quite a large area with adhesive techniques, the sculpturing process only requires a comparably small area for a firm hold. The process is particularly suitable for adding parts to existing constructions or in hard to reach places, such as bodywork in the car, ship or plane building industry. The etching process can also be used to remove surface coatings. Expanding the applications The potential applications should in future be expanded to include additional materials and shapes. Examples from fundamental research into ultra-lightweight materials with record densities of less than 1 mg/cm³ enable functional applications in aeronautics and space. Processing wires, curved surfaces and pipes are also conceivable. “This type of surface treatment acts like corrosion protection. The fine network of hooks doesn’t let any water through. Screws treated in this way, for example, wouldn’t rust solid,” explained Hartmut Schmidt-Niepenberg, from the Board of Directors at the cooperating partner, Phi-Stone AG. They are currently also conducting tests with galvanised steel sheets, like the ones used in roofing. The high temperatures cause the galvanised coating to vaporise if you weld the sheets to other metals. This is why it normally has to be removed first and then re-coated again afterwards. The Kiel research team’s etching process could significantly speed this job up. Mobile use or integrated into plants The prototype of a mobile joining unit developed by Phi-Stone AG makes the process flexible to use, too. Its modular structure also enables it to be integrated into existing plant technology and it can be individually adapted to meet industrial needs. Using etching cells produced via 3D printing, metal surfaces can be precisely processed. Together with their first customers, they want to incorporate customer requirements and develop the prototype to market-readiness. Two patents have already been registered in this regard. Key facts: What? Presentation: “Light made easy. Innovative Composites for quick joining between metals, fiber composites and functional carbon materials” Who? Prof. Dr Rainer Adelung, Functional Nanomaterials working group When? The lecture will be held in English on Monday 3 April at 11.30am and 1.30pm. In addition, demonstrators of the mobile joining unit and metal and plastic connections will be shown throughout the week. Where? CAU booth C07 in Hall 2 “Research & Technology”, exhibition grounds (Nord 2 entrance), 30521 Hanover For more information about the "Nanoscale Sculpturing" etching process: M. Baytekin?Gerngross, M.D. Gerngross, J. Carstensen and R. Adelung: Making metal surfaces strong, resistant, and multifunctional by nanoscale?sculpturing. Nanoscale Horizons. DOI: 10.1039/C6NH00140H http://pubs.rsc.org/en/content/articlelanding/2016/nh/c6nh00140h#!divAbstract Video of the joining process: https://www.youtube.com/watch?v=B3XO4RGvHqI Photosare available to download:www.uni-kiel.de/de/pressemitteilungen/2019/099-fuegetechnik-1.jpgThe Kiel University research group and its partner, the Kiel start-up Phi-Stone AG, presented their mobile joining unit at the Hannover Messe. Photo: Siekmann, CAUwww.uni-kiel.de/de/pressemitteilungen/2019/099-fuegetechnik-2.jpgThe etching cell is mounted on an aluminium surface with a vacuum-based holder, and then structured electro-chemically there in a targeted process.Photo: Siekmann, CAUwww.uni-kiel.de/de/pressemitteilungen/2019/099-fuegetechnik-3.jpgUnder the microscope, the fine barbed structure of the roughened metal surface is visible. This enables various materials to be "inter-locked" and connected with each other permanently. Photo: Mark-Daniel Gerngroß www.uni-kiel.de/de/pressemitteilungen/2019/099-fuegetechnik-4.jpgThe flange made of aluminium is firmly attached to the aluminium wall. Photo: Siekmann, CAU www.uni-kiel.de/de/pressemitteilungen/2019/099-fuegetechnik-5.jpgIn the front: the treatment with the etching process roughens the surface of the aluminium. Then it is easy tojoin it to other metals or plastics. Photo: Siekmann, CAUContact:Kiel University Professor Rainer Adelung Functional Nanomaterials Working Group Tel.: +49 (0)431/880 6116E-mail: ra@tf.uni-kiel.deWeb: www.tf.uni-kiel.de/matwis/fnanoPhi-Stone AG Hartmut Schmidt-Niepenberg, Chairman of the BoardScientific HeadTel.:+49-431-7054186E-mail:hsn@phi-stone.de>www.phi-stone.deJulia SiekmannScience communicationPriority research area Kiel Nano, Surface and Interface Science (KiNSIS)0431/880-4855jsiekmann@uv.uni-kiel.dewww.kinsis.uni-kiel.deCAU@Hannover MesseIn 2019, Kiel University (CAU) will once again present its excellent research at the Hannover Messe. Under the motto "Ways to Solutions" the state university demonstrates: science affects society in many different ways. It contributes to exchanges, solves tricky problems and creates new scenarios. All this awaits guests in Hall 2 (Research & Technology). This time, together with our partners: State of Schleswig-Holstein, the City of Kiel and theEuropean XFEL. Participation at the trade show will focus on presentations and exhibits associated with cutting-edge research, the transfer of knowledge, patents and initiatives to establish companies. Presentations and panel discussions will round off the varied programme during the week. All information can be found here: www.uni-kiel.de/hannovermesseKiNSISDetails, which are only a millionth of a millimetre in size: this is what the priority research area "Kiel Nano, Surface and Interface Science –KiNSIS" at Kiel University has been working on. In the nano-cosmos, different laws prevail than in the macroscopic world -those of quantum physics. Through intensive, interdisciplinary cooperation between physics, chemistry, engineering and life sciences,the priority research area aims to understand the systems in this dimension and to implement the findings in an application-oriented manner. Molecular machines, innovative sensors, bionic materials, quantum computers, advanced therapies and much more could be the result. More information at www.kinsis.uni-kiel.deKiel University (CAU)Press, Communication and Marketing, Dr Boris Pawlowski, Text/editing: Julia SiekmannPostal address: D-24098 Kiel, Germany, Telephone: +49 (0)431 880-2104, Fax: +49 (0)431 880-1355E-mail: presse@uv.uni-kiel.de, Internet: www.uni-kiel.de, Twitter: www.twitter.com/kieluniFacebook: www.facebook.com/kieluni, Instagram: www.instagram.com/kieluniLink: https://www.uni-kiel.de/en/details/news/099-joining

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