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4. Energy Reduction in Powder Atomization by Novel Production Process for Recycled Titanium Electrodes

Author

Denkena, Berend, Bergmann, Benjamin, Pyzcak, Florian, Rackel, Marcus Willi, Matthies, Jonas, Behrens, Bernd-Arno, Series Editor, Grzesik, Wit, Series Editor, Ihlenfeldt, Steffen, Series Editor, Kara, Sami, Series Editor, Ong, Soh-Khim, Series Editor, Tomiyama, Tetsuo, Series Editor, Williams, David, Series Editor, Bauernhansl, Thomas, editor, Verl, Alexander, editor, Liewald, Mathias, editor, and Möhring, Hans-Christian, editor

Published
2024
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13. Resource-Efficient Process Chains for the Production of High-Performance Powertrain Components in the Automotive Industry

Author

Denkena, Berend, Bergmann, Benjamin, Wichmann, Marcel, Handrup, Miriam, Katzsch, Daniel, Pillkahn, Philipp, Reuter, Leon, Schmidt, Christopher, Stelljes, Frederik, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Haddar, Mohamed, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Kohl, Holger, editor, Seliger, Günther, editor, and Dietrich, Franz, editor

Published
2023
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33. Physical-Vapor-Deposition-Coated Natural Rocks as Sustainable Cutting Material: First Insights into the Effect of Substrate Integrity on Properties of TiN Thin Film.

Author

Petersen, Hilke, Graf, Dominic, Lopes Dias, Nelson Filipe, Tillmann, Wolfgang, Wolters, Philipp Dan Hendrik, Bergmann, Benjamin, and Breidenstein, Bernd

Subjects
PHYSICAL vapor deposition, TITANIUM nitride, MACHINING, THIN films, SUBSTRATES (Materials science)
Abstract

The most important cutting materials for machining are carbides. Their production requires both tungsten and cobalt; however, these materials are becoming increasingly difficult to obtain and are sometimes mined under ethically questionable conditions. As a result, increasing efforts are being made to expand the range of cutting materials. The basic suitability of natural rocks for cutting tools in less demanding processes has already been demonstrated. PVD coating of the natural rocks could improve their performance. The adhesion mechanisms in TiN-coated natural rock samples are discussed below. The TiN thin film is characterized in depth. [ABSTRACT FROM AUTHOR]

Published
2024
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34. Design and Fabrication of 3D‐Printed Lab‐On‐A‐Chip Devices for Fiber‐Based Optical Chromatography and Sorting.

Author

Milark, Ole, Buttkewitz, Marc, Agócs, Emil, Legutko, Beate, Bergmann, Benjamin, Bahnemann, Janina, Heisterkamp, Alexander, and Torres‐Mapa, Maria Leilani

Subjects
RAPID prototyping, OPTICAL tweezers, OPTICAL devices, THREE-dimensional printing, GRANULAR flow, MICROFLUIDIC devices
Abstract

Microfluidic lab‐on‐a‐chip (LOC) devices have become essential tools for multitudes of applications in various research fields. 3D printing of microfluidic LOC devices offers many advantages over more traditional manufacturing processes, including rapid prototyping and single‐step fabrication of complex 3D structures. In this work, 3D‐printed microfluidic devices are designed and fabricated for optical chromatography and sorting. Optical chromatography is performed by inserting a single‐mode optical fiber into the device creating a counter‐propagating laser beam to the fluid flow. Particles are separated depending on refractive index and size. To demonstrate optical sorting, a cross‐type sorter 3D‐printed microfluidic device is fabricated that directs the laser beam perpendicular to the flow direction. Design features such as a sloping channel and a channel configuration for 3D hydrodynamic focusing (to aid in controlled sample flow and particle position) help to optimize sorting performance. Stable optofluidic trapping and sorting are successfully achieved using the fabricated microfluidic devices. These results highlight the tremendous potential of 3D printing of microfluidic LOC devices for applications aimed at the optofluidic manipulation of micron‐sized particles. [ABSTRACT FROM AUTHOR]

Published
2024
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47. Evaluating the Tribological Behaviour in Cutting Operations Using a Modified Ball-on-Disc Open Tribotester

Author

Nassef, Belal G., Pape, Florian, Poll, Gerhard, Schenzel, Jan, Bergmann, Benjamin, Denkena, Berend, Nassef, Belal G., Pape, Florian, Poll, Gerhard, Schenzel, Jan, Bergmann, Benjamin, and Denkena, Berend

Abstract

Predicting the tribological behaviour in the secondary shear zone in the metal-cutting processes is considered a significant challenge in contemporary research. This work investigated the frictional performance in the secondary shear zone of a planing process using a modified ball-on-disc open tribometer. The values of the coefficient of friction (COF) were tracked between an AISI4140 + QT disc (chip) and a cemented carbide ball (cutting tool) coated with TiAlN under three contact pressures of 0.5, 1, and 2 GPa at a range of sliding speeds starting from 0.2 m/s to 1.6 m/s. The tests were conducted under both dry and lubricated conditions using three commercial cutting fluids of CSF 35 straight oil, Vasco 6000, and Zubora 67H emulsions. Also, the MWFs were tested for their rheological properties and wettability. The tribometer results validated the same COF trend as that in the actual metal-cutting experiments, particularly at 0.5 and 1 GPa in dry conditions. Moreover, Zubora 67H emulsion is proven to be the optimal choice due to it reducing the COF between the rubbing contacts by up to 78%. Furthermore, it showed the lowest contact angle and viscosity index, revealing its ability to easily penetrate, especially at higher temperatures, within the secondary cutting zone.

Published
2024

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