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Fakultätsübergreifendes Institut für Werkstofftechnik


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im Institut für Werkstofftechnik

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Henkel, Sebastian; Bliedner, Jens; Rädlein, Edda; Schulze, Christian; Rost, Matthias; Gerhardt, Martin; Fuhr, Michael
Ultra-fine grinding of silicate materials under the use of new resin bond diamond tools. - In: Fourth European Seminar on Precision Optics Manufacturing / European Seminar on Precision Optics Manufacturing ; 4 (Teisnach) : 2017.04.04-05. : 4-5 April 2017, Teisnach, Germany. - Bellingham, Washington, USA : SPIE, ISBN 978-1-5106-1097-2, (2017), 1032605, insges. 6 S.

Ziegler, Mario; Yüksel, Sezin; Goerke, Sebastian; Weber, Karina; Cialla-May, Dana; Popp, Jürgen; Pollok, Kilian; Wang, Dong; Langenhorst, Falko; Hübner, Uwe; Schaaf, Peter; Meyer, Hans-Georg
Growth of hierarchically 3D silver-silica hybrid nanostructures by metastable state assisted atomic layer deposition (MS-ALD). - In: Advanced materials technologies. - Weinheim : Wiley, ISSN 2365709X, Bd. 2Bd. 2 (2017), 7, 1700015, insges. 7 Seiten
https://doi.org/10.1002/admt.201700015
Vakaliuk, Oleksii; Weidner, Markus; Halbedel, Bernd
High-temperature superconducting magnet systems for Lorentz Force Velocimetry. - In: Proceedings of the XVIII International UIE-Congress: electrotechnologies for material processing / International UIE-Congress ; 18 (Hannover) : 2017.06.06-09. : Hannover (Germany), June 6-9, 2017. - [Essen] : Vulkan-Verlag, ISBN 978-3-8027-3095-5, (2017), S. 356-361

Lorentz Force Velocimetry (hereafter abbreviated as LFV) - a technique for flow rate measurement of conducting liquid. Remarkably, due to contactless measuring, this method is advantageous for aggressive media, such as molten salts and glass melts. However, These fluids possess a weakly electrical conductance and slow velocity, resulting a small Lorentz force (in [my]N range) and, consequently, the tiny resolution. The high-temperature bulksuperconducting (HTS) magnet system (MS) is proposed to integrate the Lorentz Force Velocimetry setup rendering significantly superior magnetic field. In order to implement the HTSs, acting as trapped field magnets, the appropriate refrigeration must be considered.


Lüdtke, Ulrich; Soubeih, Senan; Halbedel, Bernd
Improving glass quality and production efficiency in glass melting tanks using additionally generated Lorentz forces. - In: Proceedings of the XVIII International UIE-Congress: electrotechnologies for material processing / International UIE-Congress ; 18 (Hannover) : 2017.06.06-09. : Hannover (Germany), June 6-9, 2017. - [Essen] : Vulkan-Verlag, ISBN 978-3-8027-3095-5, (2017), S. 170-175

Continuous glass melting tanks represent thermo-chemical reactors with very complex flow patterns. Controlling the flow patterns within the glass melting tanks with the aim of improving their performance is one of the glass industrys primary challenges. In the present work, numerical simulations are carried out on the electromagnetic flow control to investigate how well the flow can be controlled by externally generated electromagnetic Lorentz forces. The electromagnetic flow control is called "electromagnetic boosting" and can be realized by exposing the glass bath to an external magnetic field generating Lorentz forces on the glass melt as an additional flow component. The computational results show that electromagnetic boosting is an excellent way of improving the residence time distribution in glass melting tanks, ultimately resulting in better glass quality and increased production efficiency.


Kazak, Oleg; Halbedel, Bernd
Approaches for changing of electro vortex flows in DC steel making furnaces. - In: Proceedings of the XVIII International UIE-Congress: electrotechnologies for material processing / International UIE-Congress ; 18 (Hannover) : 2017.06.06-09. : Hannover (Germany), June 6-9, 2017. - [Essen] : Vulkan-Verlag, ISBN 978-3-8027-3095-5, (2017), S. 64-69

The paper devoted to the numerical simulation of processes preceding in DC electric arc furnaces (EAFs) with the bottom electrode. These furnaces have shown higher efficiency, low heat loss, lower components wear and higher quality of steel production [1]. The biggest disadvantage of such furnaces is a high rate of fettle wear near the bottom electrode that connected with electrovortex flow [2]. Electrovortex flows (EVF) appearing under electromagnetic forces as a result of non-homogeneous distribution of the current density through the liquid conductor. This effect can be observed in many technological processes: electro slag remelting process (including DC and AC EAFs, electrolysis cells and submergedresistor induction furnaces), arc welding, processes of semiconductor crystals growing, electro vortex engines etc. [3].


Nicolai, Katja
Generative Fertigung von Sinterglaskörpern für Glasdurchführungen durch 3D-Drucken. - Ilmenau : Universitätsverlag Ilmenau. - 1 Online-Ressource (PDF-Datei: 209 Seiten). - (Werkstofftechnik Aktuell. - 16)
Technische Universität Ilmenau, Dissertation, 2017

Die Arbeit behandelt die erstmalige Ergänzung des Herstellungsprozesses von Glasdurchführungen durch den Einsatz eines generativen Verfahrens zur Fertigung von Rohlingen für Sinterglaskörper sowie die Anpassung der vor- und nachgelagerten Prozessschritte an die dadurch veränderten Bedingungen. Damit sollte der herkömmliche Prozessschritt "Pressen" hinsichtlich Kosten- und Zeiteinsparung im Rahmen von Kleinserien ersetzt werden. Bei dem ausgewählten generativen Verfahren handelte es sich um den 3D - Pulverbettdruck. Der 3D - Druck von Glaspulver für technische Anwendungen war ein Novum, so dass Erfahrungswerte aus dem Bereich der Keramik den Einstieg in die Problematik und deren Weiterentwicklung für Glas ermöglichten. Die Herausforderung bestand darin, trotz der Unterschiedlichkeit der beiden Formgebungsverfahren Pressen und 3D - Pulverbettdruck vergleichbare Eigenschaften der Rohlinge für Sinterglaskörper zu erhalten. Der beim Pressen verwendete Druck für die Formgebung ist beim 3D - Pulverbettdruck nicht vorhanden. Die erforderliche Dichte und Porosität muss über eine geeignete Korngrößenverteilung der Ausgangsmaterialien erreicht werden Glaspulver mit Korngrößenverteilungen ab < 165 [my]m mit 20 % bis 30 % Feinanteilen (2 - 3 [my]m) hatten die günstigste Anordnungsmöglichkeit der Pulverbestandteile. Mit dem entwickelten Temperaturprogramm für den Entbinder- und Sinterprozess wurde durch Modellierung und Optimierung die vollständige Zersetzung der Binderbestandteile sichergestellt. Die Porositäten der durch 3D - Pulverbettdruck hergestellten Sinterglaskörper im Vergleich zu denen aus dem herkömmlichen Presseverfahren betrugen 25 % - 40 % zu 22 % und die Dichten 1,7 g/cm^3 zu 2 g/cm^3. Im Hinblick auf spätere Einschmelzungen konnten die Differenzen durch Anpassung der Abmessungen der Rohlinge ausgeglichen werden. Beide Herstellungsverfahren haben Formtoleranzen von 1 bis 2 %. Die durch 3D - Pulverbettdruck hergestellten Sinterglaskörper erfüllen die erforderlichen Qualitätsparameter bei der Verwendung für Glasdurchführungen und entsprechen dem Stand der Technik nach dem Einschmelzen. Ausgehend von diesen Ergebnissen konnte eine stabile Prozesskette für die Fertigung von Glasdurchführungen mit generativ gefertigten Rohlingen für Sinterglaskörper abgeleitet werden.


https://www.db-thueringen.de/receive/dbt_mods_00032750
Jehl, Pierre; Halbedel, Bernd; Lerp, Marianne; Schmidt, Udo; Teichert, Gerd; Schlütter, Frank
Entrapment of hard particles into Cr(VI)-free conversion layers of electrodeposited zinc coatings to improve corrosion resistance. - In: 21st Symposium on Composites. - [Zurich] : Trans Tech Publications / Symposium on Composites ; 21 (Bremen) : 2017.07.05-07., ISBN 978-3-0357-3198-9, (2017), S. 434-439

Due to the restriction of passive layers containing Cr6+ [1], which were characterized by excellent corrosion protection due to their self-healing effect for scratches on metal surfaces, current corrosion protection systems consist of chromium (III) -containing thick layer passivation. Due to their lower hardness, current corrosion protection systems are susceptible to mechanical stress. This is particularly critical at barrel plating of screws, rivets etc. where the manufacturing process leads to damages of the corrosion protection layer and consequently to reduced corrosion resistance. To counter this problem, we point out one approach to install hard particles into the passivation layer. The entrapment of the hard particles into the passivation is detected by Glow Discharge Optical Emission Spectrometry. Comparative investigations in the corrosion chamber prove the improvement of the corrosion protection of steel parts with passivation layers containing hard particles.


https://doi.org/10.4028/www.scientific.net/KEM.742.434
Hartmann, Robert; Koch, Michael
Wood chip plastic composite - a novel bio-based material with high mechanical properties. - In: Polimery. - Warsaw : Industrial Chemistry Research Institute, Bd. 62 (2017), 7/8, S. 556-559
http://dx.doi.org/10.14314/polimery.2017.556
Hahm, Christoph; Theska, René; Raab, Dagmar; Mitterhuber, Monika; Kästner, Anett
Strength enhancement of precision concrete parts by sol-gel surface coating. - In: Proceedings of the 17th International Conference of the European Society for Precision Engineering and Nanotechnology / International Conference of the European Society for Precision Engineering and Nanotechnology ; 17 (Hannover) : 2017.05.29-06.02. : May 29th - 2nd June 2017, Hannover, DE. - Bedford : euspen, ISBN 978-0-9957751-0-7, (2017), S. 51-52

In former own publications it was shown, that high precision concrete parts are a reliable alternative to natural stone for machine base frames. Beside long term stability also a predictable and highly reproducible thermal behaviour is required. The use of low expansion materials is not appropriate for a whole machine structure since these materials are coming with several drawbacks in the mechanical behaviour in combination with high costs. Thermal compensation by special design also raises cost and complexity. The application of materials with identical thermal expansion coefficients in combination with appropriate mechanical properties can solve this problem at significantly reduced costs. Concrete is a promising material for the whole machine structure under these circumstances. In contrast to base frames moving parts need to have a lightweight design thus requiring a high level of specific stiffness. Concrete with a specific stiffness close to steel is an interesting material for the design of movable components coming up with dynamic properties comparable to welded steel structures. Additionally a high material strength is needed in lightweight design. Concrete shows high compressional strength but is sensitive to tensile stress that cannot be fully eliminated. Therefore notch effects and stress concentrations need to be avoided. Reinforcement by implementation of steel or carbon fibres is not applicable since they come with thermal inhomogeneity. An alternative reinforcement can also be done by organofunctional sol-gel silane coating.


Laufer, Nico; Hansmann, Harald; Koch, Michael
Rheological characterisation of the flow behaviour of wood plastic composites in consideration of different volume fractions of wood. - In: ic-rmm2 : 2nd International Conference on Rheology and Modeling of Materials : October 5-9, 2015/Miskolc-Lillafüred, Hungary. - [Bristol] : IOP Publishing / ic-rmm ; 2 (Miskolc-Lillafüred) : 2015.10.05-09., (2017), 012017, insges. 9 S.
https://doi.org/10.1088/1742-6596/790/1/012017