Article
Polymer Science
Janez Turk, Daniel Svensek
Summary: This research presents a thermoelastomechanical approach to address deformation defects such as sink marks in injection-molded plastic parts. The method calculates the deformation by solving the elastic problem at each time step, considering the molten core as either a liquid or a rubbery state. Results show that treating the molten core as a rubbery state yields more accurate deformation predictions, maintaining the displacement of localized thermal shrinkage. The validity of the method is supported by empirical measurements on existing parts and independently molded samples.
Article
Engineering, Industrial
Sebastien Rolere, Ulrich Soupremanien, Marc Bohnke, Myriam Dalmasso, Celine Delafosse, Richard Laucournet
Summary: Mn-Zn ferrite components were successfully produced using Powder Injection Molding (PIM) with a binder system containing paraffin wax, linear low density polyethylene, and stearic acid. The study found that maximal open porosity is a key parameter for defining the optimal solvent debinding duration, leading to a reduction in thermal debinding time and prevention of structural defects.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Polymer Science
Ales Mizera, Lovre Krstulovic-Opara, Nina Krempl, Michaela Karhankova, Miroslav Manas, Lubomir Sanek, Pavel Stoklasek, Alen Grebo
Summary: Polyethylenes are widely used polymers with good processability, mechanical properties, and chemical resistance. However, their low temperature stability limits their use in high temperature applications. The modification of HDPE by accelerated electrons has shown positive effects on its temperature stability and dynamic tensile behavior.
Article
Polymer Science
Jian-Yu Chen, Jia-Xiang Zhuang, Ming-Shyan Huang
Summary: The injection molding process often relies on fixed machine settings, but the properties of the plastic melt can change from batch to batch. This study introduces a new quality monitoring and control system based on tie bar elongation measurements to adjust processing parameters and ensure the stability and consistency of molded part quality. Experimental results show that adjustments based on tie bar strain characteristics can enhance yield rate and improve quality consistency.
Article
Polymer Science
Jiquan Li, Wenyong Liu, Xinxin Xia, Hangchao Zhou, Liting Jing, Xiang Peng, Shaofei Jiang
Summary: The study introduced external gas-assisted injection molding (EGAIM) to reduce burn marks on injection-molded parts, with results showing that burn marks can be effectively eliminated by EGAIM, and the gas delay time is the most critical gas parameter affecting the severity of burn marks.
Article
Chemistry, Physical
Ales Mizera, Miroslav Manas, Pavel Stoklasek
Summary: The temperature ageing of high-density polyethylene (HDPE) modified by radiation cross-linking was studied. The results showed that radiation cross-linking significantly improved the temperature stability of HDPE.
Article
Engineering, Chemical
Joshua Krantz, Ashley Caiado, Leonardo Piccolo, Peng Gao, Marco Sorgato, Giovanni Lucchetta, Davide Masato
Summary: This study aims to create superhydrophobic surfaces by generating submicron structures on steel mold inserts using ultrafast femtosecond laser and replicating them on plastic parts through micro injection molding. The effects of mold temperature, texture orientation, and material selection on the dynamic contact angle were investigated, and a large contact angle hysteresis was observed, indicating a parahydrophobic wetting behavior for the manufactured plastic parts.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Engineering, Manufacturing
Julia Volke, Margarita Reit, Hans -Peter Heim
Summary: Injection molding is a widely used manufacturing process for complex plastic shapes. Machine learning methods can analyze existing data to predict optimal parameters for newly developed parts, saving time and resources and improving production efficiency.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Polymer Science
Saeid Saeidi Aminabadi, Paul Tabatabai, Alexander Steiner, Dieter Paul Gruber, Walter Friesenbichler, Christoph Habersohn, Gerald Berger-Weber
Summary: Automatic in-line process quality control is crucial in the injection molding industry. This study presents a fully automated closed-loop injection molding setup based on Industry 4.0 standards, with AI control system and predictive models to control part quality.
Article
Materials Science, Multidisciplinary
Serhii Lavrys, Iryna Pohrelyuk, Juozas Padgurskas, Khrystyna Shliakhetka
Summary: The wear resistance of highly porous titanium in the tribo-pair with bronze under boundary lubrication condition was found to be poor due to subsurface pores leading to micro-crack nucleation. Surface engineering methods such as deformation, diffusion, and their combination were effective in improving the wear resistance by changing the main wear mechanism from adhesive and fatigue to abrasive. The highest wear resistance was achieved through a combination of surface deformation and diffusion treatment.
Article
Polymer Science
Donghwi Kim, Youngjae Ryu, Ju-Heon Lee, Sung Woon Cha
Summary: Research on injection using aluminum flakes has shown that foam injection molding can increase reflectance and gloss, as well as improve impact strength and flexural modulus compared to conventional injection molding methods. These findings suggest that foam injection could lead to esthetic improvements and enhanced functionality in products.
Article
Polymer Science
Shaofei Jiang, Yuansong Zhang, Haowei Ma, Xiaoqiang Zha, Xiang Peng, Jiquan Li, Chunfu Lu
Summary: This study experimentally investigated the replication uniformity of microstructures and found that the cavity thickness and process parameters have significant influence on the uniformity. The experimental results provide important data on how to improve the replication uniformity of parts with microstructure arrays.
Review
Engineering, Chemical
Ganesh Jadhav, Vivek Gaval, Sachin Solanke, Mahesh Divekar, Nandkishor Darade, Ajay Satpute, G. P. Goutham
Summary: Injection molding manufacturing is widely popular for its ability to produce complex designs using various engineering plastic materials. This article provides a comprehensive review of weld-line formation during injection molding, including the phenomenon, types, and importance of weld-line evaluation. Theoretical, experimental, and computational approaches for analyzing weld-line and its strength are discussed in detail. Additionally, methods for reducing the number of weld-lines and increasing the strength of the weld-line area are explored. The review also gathers data on weld-line strength across different materials.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Engineering, Chemical
Demitri Shotwell, Jinsu Gim, Huaguang Yang, Stefanie Glas, Edward Chen, Lih-Sheng Turng
Summary: The effect of an in-mold static mixer on the optical properties of polystyrene parts in the injection molding process was studied. Experimental and simulation results showed a certain correlation, but there were also some differences that could be attributed to measurement accuracy or unaccounted-for variables. The use of a static mixer can homogenize the polymer melt in the injection process, but it may also have a negative impact on the optical performance due to increased melt flow and residual stresses.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Amanda Heimbrook, Cambre Kelly, Ken Gall
Summary: This study investigates the influence of the geometry of a 3D printed porous surface implant on the bone-implant interface. It reveals that porosity is a significant factor affecting expulsion, subsidence, and shear strength. The experiments suggest that the 6 x 6 x 6 0.75 mm wall thickness gyroid design exhibits the best overall performance characteristics.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
Markus Wolf, Daniel Emil Mack, Georg Mauer, Olivier Guillon, Robert Vassen
Summary: This study investigated the deposition of ytterbium disilicate (YbDS) at short stand-off distances and different total feed rates and oxy-fuel ratios. The results showed that the overall degree of crystallinity could be maintained above 90%, with porosities below 10% achieved. However, fully dense coatings were hindered by the accumulation of stresses within the coatings.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Chemistry, Physical
Markus Mann, Michael Kuepers, Grit Haeuschen, Martin Finsterbusch, Dina Fattakhova-Rohlfing, Olivier Guillon
Summary: LLZO is a promising oxide-ceramic solid electrolyte for all-solid-state batteries, with dopants like Al, Ta, Nb, Ga, and W enhancing its ionic conductivity. The study investigates the impact of hafnium impurities on tantalum-doped LLZO, finding that hafnium has limited effect on the material's performance up to a certain concentration level. This research has implications for reducing the cost of LLZO by using lower grade zirconium sources.
Article
Materials Science, Ceramics
Khushnuda Nur, Muhammad Zubair, James S. K-L. Gibson, Stefanie Sandloebes-Haut, Joachim Mayer, Martin Bram, Olivier Guillon
Summary: The mechanical properties of cold sintered and conventionally sintered ZnO samples were compared using nanoindentation and micro-pillar testing. It was found that cold sintered samples had higher hardness but lower elastic modulus and compressive stress. Transmission electron microscopy investigations confirmed the distinctive nature of grain boundary regions in cold sintered samples that influenced their deformation behavior.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Martin Ihrig, Martin Finsterbusch, Alexander M. Laptev, Chia-Hao Tu, Ngoc Thanh Thuy Tran, Che-An Lin, Liang-Yin Kuo, Ruijie Ye, Yoo Jung Sohn, Payam Kaghazchi, Shih-Kang Lin, Dina Fattakhova-Rohlfing, Olivier Guillon
Summary: The garnet-type Li7La3Zr2O12 (LLZO) ceramic solid electrolyte has high Li-ion conductivity and chemical stability at room temperature. However, capacity fading during cycling is a common issue. Investigation of the LiCoO2/LLZO interface revealed electrochemically driven cation diffusion, leading to the formation of an amorphous secondary phase interlayer with high impedance and causing capacity fading. Thermodynamic analysis also suggests the formation of low- or non-conducting secondary phases during cycling, further contributing to capacity fading. Understanding this degradation process is crucial for improving the cycling stability of garnet-based all-solid-state Li batteries.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Ceramics
Dariusz Garbiec, Alexander M. Laptev, Volf Leshchynsky, Maria Wisniewska, Pawel Figiel, Anna Biedunkiewicz, Piotr Siwak, Jan Raethel, Johannes Poetschke, Mathias Herrmann
Summary: The sintering process of WC-Ti powder mixtures with different titanium contents was investigated, and it was found that the phase composition and microstructure of the samples varied with different titanium contents. The sample with 5% titanium showed the best combination of hardness and fracture toughness.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Martin Ihrig, Enkhtsetseg Dashjav, Alexander M. Laptev, Ruijie Ye, Daniel Gruner, Mirko Ziegner, Philipp Odenwald, Martin Finsterbusch, Frank Tietz, Dina Fattakhova-Rohlfing, Olivier Guillon
Summary: The study aims to enhance the utilization of cathode active material by infiltrating a Li-ion-conducting polymer into a ceramic cathode in polymer-ceramic composites. However, the formation of Li dendrites penetrating the separator remains a challenge for future work.
JOURNAL OF POWER SOURCES
(2022)
Article
Energy & Fuels
Moritz L. Weber, Moritz Kindelmann, Egbert Wessel, Alexandros Sarantopoulos, Norbert H. Menzler, Regina Dittmann, Rainer Waser, Olivier Guillon, Christian Lenser, Felix Gunkel
Summary: Metal exsolution is a dynamic process driven by reducing atmosphere and elevated temperatures, which leads to the self-assembly of nanoparticles at the surface of complex perovskite catalysts. The characteristics of metal exsolution catalysts can be highly inhomogeneous, and the anisotropic surface properties of ceramic oxides have been found to significantly affect the exsolution behavior.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Nanoscience & Nanotechnology
Martin Ihrig, Liang-Yin Kuo, Sandra Lobe, Alexander M. Laptev, Che-an Lin, Chia-hao Tu, Ruijie Ye, Payam Kaghazchi, Luca Cressa, Santhana Eswara, Shih-kang Lin, Olivier Guillon, Dina Fattakhova-Rohlfing, Martin Finsterbusch
Summary: All-solid-state lithium batteries are promising for energy storage, but suffer from performance degradation during cycling. This study shows that thermal recovery can recrystallize the amorphized interface, restoring the cell performance. Detailed analysis and thermodynamic modeling provide a comprehensive understanding of the structural and chemical changes. Through thermal recovery, more than 80% of the initial storage capacity can be recovered, offering potential for cost-efficient recycling of ceramic all-solid-state batteries.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Maria Wisniewska, Alexander M. Laptev, Mateusz Marczewski, Volf Leshchynsky, Grzegorz Lota, Ilona Acznik, Luca Celotti, Alex Sullivan, Miroslaw Szybowicz, Dariusz Garbiec
Summary: Carbon nanotubes (CNTs) are widely used in ceramic-matrix composites (CMC) as a filler. They have high thermal conductivity individually, but only have a moderate influence on the thermal conductivity of CMCs. However, even a small quantity of CNTs can significantly increase the electrical conductivity of CMCs. The present study investigates the influence of multi-wall carbon nanotubes (MWCNTs) on the thermal and electrical conductivity of ZrO2-CNTs composites, revealing the contradictory effects of CNTs on these properties.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Andrea Schreiber, Melanie Rosen, Katja Waetzig, Kristian Nikolowski, Nikolas Schiffmann, Hartmut Wiggers, Michael Kuepers, Dina Fattakhova-Rohlfing, Wilhelm Kuckshinrichs, Olivier Guillon, Martin Finsterbusch
Summary: All-solid-state batteries are a promising research topic for their high energy density and safety. However, implementing oxide ceramic electrolytes in industrial cells remains challenging. To address this, researchers proposed a target cell design combining two promising oxidic electrolytes, LLZO and LATP, and assessed their environmental impact. In-depth life cycle assessment revealed surprising similarities between oxide-based all-solid-state batteries and conventional Li-ion batteries.
Article
Dentistry, Oral Surgery & Medicine
Guilherme Pauletto, Israel Bangel Carlotto, Lucas Saldanha da Rosa, Natalia de Freitas Daudt, Gabriel Kalil Rocha Pereira, Carlos Alexandre Souza Bier
Summary: This study aimed to compare the effect of sodium hypochlorite (NaOCl) and calcium hypochlorite [Ca(OCl)(2)] on the bond strength to pulp chamber dentin, and to evaluate the use of sodium thiosulfate (Na2S2O3) after these solutions. Results showed that the use of NaOCl was associated with the lowest bond strength, while Ca(OCl)(2) had similar bond strength to the control group. Na2S2O3 was able to increase the bond strength after NaOCl, but not after Ca(OCl)(2).
EUROPEAN JOURNAL OF ORAL SCIENCES
(2023)
Article
Green & Sustainable Science & Technology
Monica Keszler, Felix Grosswendt, Anna-Caroline Assmann, Martin Krengel, Fernando Maccari, Oliver Gutfleisch, Doris Sebold, Olivier Guillon, Sebastian Weber, Martin Bram
Summary: Recycling of Nd-Fe-B magnets is a challenge, but combining FAST/SPS and flash SPS techniques can directly produce magnets from 100% scrap material with properties similar to commercial magnets.
ADVANCED ENERGY AND SUSTAINABILITY RESEARCH
(2023)
Article
Energy & Fuels
Vishnu Ganesh, Daniel Dorow-Gerspach, Martin Bram, Christian Linsmeier, Jiri Matejicek, Monika Vilemova
Summary: The realization of the first wall (FW) in future fusion reactors, which is composed of a tungsten (W) armor covering steel material, is a critical challenge. This study benchmarks two joining concepts to address the cyclic thermal stress issue caused by the different coefficients of thermal expansion (CTE) of W and steel. One concept uses an atmospheric plasma sprayed graded interlayer, while the other uses a spark plasma sintered graded interlayer. The results show that the joints with a plasma sprayed graded interlayer and a vanadium interlayer can withstand higher heat flux.
Article
Nuclear Science & Technology
D. Dorow-Gerspach, M. Bram, V. Ganesh, J. Matejicek, G. Pintsuk, M. Vilemova, M. Wirtz, C. Linsmeier
Summary: The joining of tungsten and steel is crucial for future commercial fusion reactors, but the large difference in their coefficient of thermal expansion can lead to high thermal stresses and premature failure of the joint. Two solutions explored in this study are the use of functionally graded materials with varying thermal expansion coefficients and the insertion of a ductile metal interlayer. Different joining technologies were evaluated through high heat flux benchmark tests.
NUCLEAR MATERIALS AND ENERGY
(2023)
Article
Electrochemistry
Asmaa Loutati, Philipp Odenwald, Burak Aktekin, Joachim Sann, Olivier Guillon, Frank Tietz, Dina Fattakhova-Rohlfing
Summary: In this study, Li1+xMx3+Zr2-x(PO4) series materials were prepared by solution-assisted solid-state reaction, where M3+ = Al3+, Sc3+, Y3+, and the influence of substitution on crystallographic parameters, density, and ionic conductivity was investigated. Different cation substitutions showed varied effects on the ionic conductivity and structure properties of the materials.
BATTERIES & SUPERCAPS
(2022)
