Review
Automation & Control Systems
Yu Huang, Chengyong Wang, Feng Ding, Yang Yang, Tao Zhang, Xiaolin He, Lijuan Zheng, Naitao Li
Summary: Plasma electrolytic polishing (PeP) is an innovative technology used to achieve metal surfaces with low roughness and high gloss. Its advantages of high efficiency, no structural selectivity, and low pollution have attracted significant attention. This paper introduces the basic principles, characteristics, control parameters, and electrolyte jet polishing methods of PeP technology, providing insights into its prospects.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Hans-Peter Schulze, Henning Zeidler, Oliver Kroning, Falko Bottger-Hiller, Mathias Herzig
Summary: Plasma-electrolytic Polishing is an innovative process using water-based electrolytes for deburring and surface smoothing. It is efficient, does not affect the functional geometry, and achieves lower surface roughness.
INTERNATIONAL JOURNAL OF MATERIAL FORMING
(2022)
Article
Materials Science, Coatings & Films
Sehoon An, Rudiger Foest, Katja Fricke, Hendrik Riemer, Maik Froehlich, Antje Quade, Jan Schaefer, Klaus-Dieter Weltmann, Holger Kersten
Summary: The article explores the versatility of plasma electrolytic polishing (PEP) for cleaning and coating the surface of cemented carbide cutting tools. Results show that PEP treatment improves cleaning effectiveness and coating adhesion, leading to a significant increase in tool life.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Susanne Quitzke, Oliver Kroening, Daniel Safranchik, Henning Zeidler, Igor Danilov, Andre Martin, Falko Boettger-Hiller, Shai Essel, Andreas Schubert
Summary: Plasma electrolytic polishing (PeP) is an innovative machining technique for complex parts and micro features. However, its applicability is usually limited by the power provided by the process energy source (PES), and localized treatment is not possible. To overcome these issues, this study presents an alternative process arrangement for localized PeP.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Chemistry, Physical
Vincent N. Stepputat, Henning Zeidler, Daniel Safranchik, Evgeny Strokin, Falko Boettger-Hiller
Summary: Additive manufacturing of Nitinol shows promise but requires post-processing. Plasma electrolytic polishing effectively removes surface defects without affecting shape memory properties, although it leads to a decrease in spring rate.
Article
Materials Science, Multidisciplinary
Rita John, M. Umamaheshwari
Summary: This paper investigates the effects of ternary addition of cobalt to B2 NiTi alloy on its crystal structure, electronic and mechanical properties. By using first-principles calculations, it is found that cobalt prefers to substitute for nickel on the sub-lattice, leading to an increase in Young's and shear modulus as well as a decrease in ductility. The decrease in ductility is ascribed to the reduction of delocalized d states and the strengthening of d-d hybridization upon cobalt addition.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
D. Katrakova-Krueger, L. Pegoraro, L. Salmaso, C. Hartl, I. Schulz, S. Weichert, R. Steffen
Summary: Ni-Ti alloys have a wide range of applications and possess great potential for innovative smart products due to their shape memory effect and superelasticity. However, forming and machining these alloys into concrete products is challenging. Laser welding of Ni55/Ti45 foil with a thickness of 125 μm was investigated and optimal parameters were determined. The effect of laser beam oscillation on this alloy was also studied, and the microstructure and mechanical characteristics of the welded joints were analyzed.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Katharina Witzke, Renko Kensbock, Caroline Ulrike Willsch, Katja Fricke, Sander Bekeschus, Hans-Robert Metelmann
Summary: This study evaluated the effects of sandblasting and plasma electrolytic polishing on Co-Cr-Mo dental alloy samples. Results showed that plasma electrolytic polishing can achieve nanometer-level surface roughness on Co-Cr-Mo surfaces, comparable to conventional mechanical polishing.
Article
Materials Science, Coatings & Films
Bosung Seo, Hyung-Ki Park, Hyung Giun Kim, Won Rae Kim, Kwangsuk Park
Summary: This study investigated the corrosion behavior of additive-manufactured CoCr parts, finding that plasma electrolytic polishing (PEP) forms a more corrosion-resistant oxide film, enhancing the material's corrosion resistance compared to mechanical polishing. The results indicate that PEP treatment results in a stable surface with higher resistance to corrosion, as shown by transmission electron microscope (TEM) and electro-chemical impedance spectroscopy (EIS) analysis.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Mechanics
William Ronan, Donnacha J. Mcgrath, Reyhaneh N. Shirazi, Marie Clancy, Roger C. Dickenson, Peter E. Mchugh
Summary: Guidewires are critical components in medical implant and device delivery systems, but their performance can be affected by phenomena known as lag and whip. This study investigates the torsional response of Nitinol guidewires using computational modeling and analytical approaches, aiming to understand the mechanisms behind lag and whip and their relationship with specific material properties and wire configuration. The results show that twisting and bending of the wire in curved paths are crucial in the generation of lag and whip.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Review
Materials Science, Multidisciplinary
S. S. Mani Prabu, S. Aravindan, S. Ghosh, I. A. Palani
Summary: This paper discusses the influence of welding process parameters on the metallurgical and mechanical properties of both similar and dissimilar welding of Nitinol using solid-state welding processes. In addition, the smart functional properties and corrosion behavior of the welded structure have been discussed.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Kristina Navickaite, Klaus Nestler, Michael Penzel, Falko Boettger-Hiller, Henning Zeidler
Summary: Separate processes for shape setting and polishing of Nitinol workpieces are well investigated in scientific literature and adopted industrially. However, a simultaneous process for shape setting and polishing of Nitinol has not yet been reported. In this study, preliminary results of such process are presented, providing insights and directions for further research on post-processing shape memory materials.
SN APPLIED SCIENCES
(2023)
Article
Chemistry, Physical
Sergei Kusmanov, Ivan Tambovskiy, Sergey Silkin, Roman Nikiforov, Roman Belov
Summary: The study demonstrates the possibility of increasing the hardness to 1420 HV and the corrosion resistance of the CP-Ti surface through a combined plasma electrolytic treatment. The treatment involves anodic plasma electrolytic nitrocarburising in a solution of ammonia, acetone, and ammonium chloride at 900 degrees C, followed by plasma electrolytic polishing. The research focuses on the morphology, surface roughness, phase composition, structure, microhardness, and corrosion characteristics of the modified layer. Results show that an increase in surface roughness negatively affects the corrosion resistance, and plasma electrolytic polishing can effectively remove the outer porous oxide layer for improved corrosion resistance. The best reduction in corrosion current density is achieved after plasma electrolytic polishing in a solution of ammonium fluoride (4%) at 300 V for 3 minutes, with a decrease of 13 times compared to CP-Ti and two orders compared to a plasma electrolytic nitrocarburising sample.
Article
Materials Science, Coatings & Films
Chuanqiang Zhou, Ning Qian, Honghua Su, Zhao Zhang, Wenfeng Ding, Jiuhua Xu
Summary: Inconel 718 nickel-based superalloys are important aerospace materials. This study investigates the influence of vapor gaseous envelope (VGE) behaviors on the polishing effect and provides important insights using experimental and simulation methods.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Ruzil Farrakhov, Olga Melnichuk, Evgeny Parfenov, Veta Mukaeva, Arseniy Raab, Vadim Sheremetyev, Yulia Zhukova, Sergey Prokoshkin
Summary: The study compares plasma electrolytic oxidation (PEO) coatings on commercially pure titanium and a novel superelastic alloy Ti-18Zr-15Nb (at. %) for implant applications. Results show that the PEO coating on Ti-18Zr-15Nb alloy exhibits higher thickness, porosity, and roughness compared to the coating on commercially pure titanium, providing better corrosion protection.
Article
Engineering, Manufacturing
Hans-Peter Schulze, Henning Zeidler, Oliver Kroning, Falko Bottger-Hiller, Mathias Herzig
Summary: Plasma-electrolytic Polishing is an innovative process using water-based electrolytes for deburring and surface smoothing. It is efficient, does not affect the functional geometry, and achieves lower surface roughness.
INTERNATIONAL JOURNAL OF MATERIAL FORMING
(2022)
Article
Energy & Fuels
Kai Knobloch, Yousif Muhammad, Marta Soler Costa, Fabrizio Mayta Moscoso, Christian Bahl, Ole Alm, Kurt Engelbrecht
Summary: Low-cost, grid-level energy storage is crucial for maximizing renewable energy utilization and decarbonizing the electricity sector. This paper presents the design and testing of a high-temperature thermal energy storage based on rocks, which is scalable and can be implemented at a low cost in Northern Europe and other regions.
Article
Thermodynamics
M. Masche, J. Liang, K. Engelbrecht, C. R. H. Bahl
Summary: An experimental rotary magnetocaloric prototype utilizing active magnetic regeneration was presented as an alternative to traditional cooling systems. The prototype achieved efficient cooling using gadolinium spheres and water mixed with ethylene glycol as the refrigerant and heat transfer fluid, respectively. Operating near room temperature, the system demonstrated cooling powers exceeding 800 W at 1.4 Hz, comparable to existing magnetocaloric devices.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Chemical
Henning Zeidler, Falko Boettger-Hiller
Summary: Additive manufacturing technology provides new options for engineering design of complex parts, enabling freeform shapes, grid-like structures, and internal cavities for functional integration, reducing assembly and space requirements, and increasing reliability. However, post-processing is required for acceptable surface roughness and functionality in metal additive manufacturing. Plasma-electrolytic polishing offers a toolless and effective solution with excellent achievable surface properties.
CHEMIE INGENIEUR TECHNIK
(2022)
Article
Engineering, Manufacturing
Susanne Quitzke, Oliver Kroening, Daniel Safranchik, Henning Zeidler, Igor Danilov, Andre Martin, Falko Boettger-Hiller, Shai Essel, Andreas Schubert
Summary: Plasma electrolytic polishing (PeP) is an innovative machining technique for complex parts and micro features. However, its applicability is usually limited by the power provided by the process energy source (PES), and localized treatment is not possible. To overcome these issues, this study presents an alternative process arrangement for localized PeP.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Editorial Material
Energy & Fuels
Kurt Engelbrecht, Nini Pryds
Summary: Researchers demonstrate electrochemical refrigeration based on the thermogalvanic effect as a potential solution to address the ever-growing energy consumption for indoor cooling. It offers higher efficiency, environmental friendliness, and grid flexibility.
Article
Thermodynamics
Jierong Liang, Marvin Masche, Kurt Engelbrecht, Christian R. H. Bahl
Summary: The design of thermal regenerators considers fundamental influencing variables and can be complicated by the nonlinearity of coupled phenomena in novel solid-state cooling systems using active caloric regenerators. Analytical expressions are derived to elucidate the operation of active regenerators with sinusoidal magnetic field and fluid flow boundary conditions, and validation is done with an internal temperature measurement system. The derived expressions show acceptable accuracy compared to experimental and numerical results, with average and maximum errors of approximately 10% and 15% respectively, and provide useful figures of merit for temperature profiles.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Review
Green & Sustainable Science & Technology
Ting Liang, Andrea Vecchi, Kai Knobloch, Adriano Sciacovelli, Kurt Engelbrecht, Yongliang Li, Yulong Ding
Summary: This article provides a comprehensive review of the key components of Carnot Batteries, including compressors, expanders, thermal energy storage, heat exchangers, and working fluids. It highlights the development status, technical performance, operating parameters, and cost functions of these components. The article also identifies the critical research barriers and development needs for further advancement of Carnot battery systems.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Nanoscience & Nanotechnology
Christian R. H. Bahl, Jierong Liang, Marvin Masche, Kaspar K. Nielsen, Kurt Engelbrecht
Summary: A virgin phase transition is observed in spherical particles of the industrially relevant magnetocaloric material La(Fe,Mn,Si)(13)H-y, with the transition occurring 2-3 K below the heating transition on subsequent cooling and heating cycles. Differential scanning calorimetry and vibrating sample magnetometry were used to study this virgin phase transition, which was found to require cooling about 6 K below the observed phase transformation for complete transformation. No structural damage was observed due to thermal cycling, both macroscopically and by scanning electron microscopy.
Article
Energy & Fuels
Ibrahim Al Asmi, Kai Knobloch, Roman Le Goff Latimier, Thibaut Esence, Kurt Engelbrecht, Hamid Ben Ahmed
Summary: The potential of thermal storages in multi-energy networks is highlighted due to the increasing use of renewable energies. Meta modeling, based on simulation data from previous physical modeling, is proposed as an alternative to overcome the challenges of integrating physical models into the management of multi-energy networks. The developed meta model shows a significant reduction in calculation time compared to physical models while still providing accurate estimations.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Kai Knobloch, Thomas Ulrich, Christian Bahl, Kurt Engelbrecht
Summary: This study systematically investigates the potential degradation of a rock bed thermal energy storage system and evaluates the performance changes of a 1 MWh(th) rock bed pilot plant. The research findings demonstrate that the main reason for decreased storage performance is system-level changes, despite a measured decrease in the rock's heat capacity. Additionally, the study reveals the long-term behavior of rock bed thermal energy storage and shows no significant changes in the storage material. Therefore, selecting suitable storage material and design is crucial for minimizing avoidable performance losses caused by system-level aspects.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
M. Masche, J. Liang, K. Engelbrecht, C. R. H. Bahl
Summary: The study suggests that solenoid valves play a crucial role in optimizing the cooling performance and achieving rapid temperature pulldown in magnetic refrigeration systems. By adjusting the opening percentage of control valves, it is possible to enhance cooling capacity and system efficiency, while lower blow fractions facilitate a faster temperature reduction.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
M. Masche, J. Liang, K. Engelbrecht, C. R. H. Bahl
Summary: Magnetocaloric energy conversion devices have the potential to reduce refrigerant leakage emissions, but their efficiency is lower than vapor compression systems. The study experimentally demonstrates the advantage of modulating the cooling capacity of an active magnetic regenerator prototype for the first time. By adjusting the cycle frequency and volumetric flow rate, the device achieves higher efficiency and competitive performance with traditional vapor compression systems.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Article
Materials Science, Multidisciplinary
Kun Wang, Kurt Engelbrecht, Christian R. H. Bahl
Summary: Elastocaloric cooling, which exploits the strain-induced crystallization of soft elastomeric polymers, has been investigated as an eco-friendly alternative to traditional refrigeration. In this study, the elastocaloric properties and cooling performance of five thermoplastic elastomers that can be 3D printed were explored. The materials were characterized as filaments to identify those with the highest elastocaloric effects, and additive manufacturing (AM) parameters were optimized to achieve functional stability while maintaining the elastocaloric effect. The results show the potential for using AM elastocaloric elastomers in the development of regenerative cooling components.
APPLIED MATERIALS TODAY
(2023)
Review
Engineering, Manufacturing
Abid Shah, Rezo Aliyev, Henning Zeidler, Stefan Krinke
Summary: Wire arc additive manufacturing (WAAM) is an emerging technology that has the potential to produce medium-to-large-scale metallic components/structures for various industries. It offers advantages such as shorter lead time, reduced material waste, and cost-effectiveness compared to traditional manufacturing processes. This review paper discusses the critical aspects of the WAAM process, challenges faced, monitoring methods, gases used, and different materials utilized. It also provides an overview of recent developments in depositing copper-based alloys using the WAAM process.
JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING
(2023)
