Liquid metal batteries - materials selection and fluid dynamics. - In: Final LIMTECH Colloquium and International Symposium on Liquid Metal Technologies, (2017), S. 012013, insges. 14 S.
https://doi.org/10.1088/1757-899X/228/1/012013
Silicon grass based nano functional electrodes for MEMS supercapacitors of improved energy density. - In: Transducers'17, Kaohsiung, ISBN 978-1-5386-2732-7, (2017), S. 1828-1831
https://doi.org/10.1109/TRANSDUCERS.2017.7994425
Ultra-fine grinding of silicate materials under the use of new resin bond diamond tools. - In: Fourth European Seminar on Precision Optics Manufacturing, ISBN 978-1-5106-1097-2, (2017), 1032605, insges. 6 S.
High-temperature superconducting magnet systems for Lorentz Force Velocimetry. - In: XVIII International UIE-Congress - Electrotechnologies for Material Processing, 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.
Improving glass quality and production efficiency in glass melting tanks using additionally generated Lorentz forces. - In: XVIII International UIE-Congress - Electrotechnologies for Material Processing, 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.
Approaches for changing of electro vortex flows in DC steel making furnaces. - In: XVIII International UIE-Congress - Electrotechnologies for Material Processing, 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].
Entrapment of hard particles into Cr(VI)-free conversion layers of electrodeposited zinc coatings to improve corrosion resistance. - In: 21st Symposium on Composites, (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
Wood chip plastic composite - a novel bio-based material with high mechanical properties. - In: Polimery, ISSN 0032-2725, Bd. 62 (2017), 7/8, S. 556-559
http://dx.doi.org/10.14314/polimery.2017.556
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, (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.
Nanostructuring of graphene on semi-insulating SiC. - In: Materials science forum, ISSN 1662-9752, Bd. 897 (2017), S. 735-738
https://doi.org/10.4028/www.scientific.net/MSF.897.735