Creating large structures with high volume or with the highest-possible resolution: The Laser Zentrum Hannover e.V. (LZH) is carrying out research on diverse processes for additive manufacturing, in order to push past the present limits. At the Hannover Messe 2017, at the pavilion of the State of Lower Saxony (hall 2, stand A08), the LZH is presenting the state of the art.
The sky's the limit: laser deposition welding
Large amounts of material can be processed very quickly with additive manufacturing on the macro and XXL scale. Using wire-based deposition welding, scientists at the LZH are able to completely construct metal parts, or change finished parts.
The relatively slow deposition rates of laser-wire deposition welding can be significantly increased by using additional energy sources, such as arc lamps. At the moment, deposition rates of over 10 kg/h are possible. Curved surfaces can be treated using powder-based, laser deposition welding.
Special materials from macro to micro
Selective laser melting can be used to accurately and precisely manufacture small components made of metal. Using this processing method, the laser beam melts very fine metal powder, layer for layer. For structures with a resolution of less than 30 µm, selective laser micro-melting can be used. The LZH is researching for both methods the use of special materials such as magnesium or shape memory alloys such as nickel-titanium.
Microcomponents made of more than one material
Additional processes for the micrometer scale are stereolithography (SLT) and nozzle-based processes for metals and polymers. For both methods, the LZH can currently achieve lateral resolutions of 5 to 10 µm. It is possible to build up layers of different materials and to change the material within one layer.
From nanometer to centimeter
Two-photon-polymerization (2PP) can be used to manufacture micro- and nano-structured objects using direct laser printing. In comparison to most 3-D printing processes, strict layer by layer manufacturing is not necessary, and the laser can print objects in a polymer, both three-dimensionally and directly.
This technology is especially interesting because it is non-contact, and structure resolutions can be scaled on a wide range, from sub-100 nm to several micrometers. In the labs at the LZH, larger volumes up to the centimeter range can also be printed.
Melanie Gauch | Laser Zentrum Hannover e.V.
Innovative process for environmentally friendly manure treatment comes onto the market
03.05.2018 | Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB
No compromises: Combining the benefits of 3D printing and casting
23.03.2018 | Fraunhofer-Institut für Produktionstechnik und Automatisierung IPA
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...
A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.
The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...
Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.
Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...
A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.
Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...
02.05.2018 | Event News
13.04.2018 | Event News
12.04.2018 | Event News
17.05.2018 | Physics and Astronomy
17.05.2018 | Power and Electrical Engineering
17.05.2018 | Medical Engineering