Article
Chemistry, Physical
Hongjie Luo, Jiahao Zhao, Hao Du, Wei Yin, Yang Qu
Summary: Titanium foam has attracted special attention due to its specific structure and potential applications. This study fabricated titanium foams using a powder metallurgy route, with magnesium powders playing a crucial role in the deformation and densification process. The pore structure of the titanium foam depended on the amount and size of the magnesium spacer holders used.
Article
Materials Science, Multidisciplinary
Tao Xiang, Jie Chen, Weizong Bao, Shuyan Zhong, Peng Du, Guoqiang Xie
Summary: Stress shielding occurs due to the disparity in stiffness between bone and implant materials, leading to bone resorption and loosening, and ultimately causing implantation failure. The use of a porous structure design can achieve a low Young's modulus that matches that of human bone, addressing this issue. In this study, a TiZrNbTa/Ti titanium matrix composite (TMC) with high strength and ductility was used as scaffold material, and a novel space holder (MgO particles) was employed to withstand high-temperature sintering. The resulting porous TiZrNbTa/Ti material demonstrated higher strength and a matching Young's modulus, showing promise for clinical application.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Review
Materials Science, Multidisciplinary
Francisco Cavilha Neto, Mauricio Vitor Giaretton, Guilherme Oliveira Neves, Claudio Aguilar, Marcelo Tramontin Souza, Cristiano Binder, Aloisio Nelmo Klein
Summary: Titanium foams have gained increasing interest in the biomedical industry as biomimetic implants in the past two decades. The porous structure is crucial for bone adhesion and reducing elastic modulus to enhance compatibility with bone.
Article
Environmental Sciences
Abderrahim Khtibari, Said El Ouahbi, Abderrazak En-Naji, Abdelkrim Kartouni, Mohamed El Ghorba
Summary: The demand for polymers has been increasing over the past decade due to their unique properties. This has led mechanical engineers to study material damage problems, as partial or total ruptures resulting from these problems often cause accidents. This paper investigates the impact of strain rate on the damage of chlorinated polyvinyl chloride compounds through tensile tests conducted at different strain rates. Two damage models are developed based on the concept of stress, which enable the description and prediction of the mechanical behavior and damage development of chlorinated polyvinyl chloride.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Civil
Juan P. Villacreses, Bernardo Caicedo, Silvia Caro, Fabricio Yepez
Summary: This article describes the development of a new device to measure the Young's modulus of geomaterials, based on the propagation of nonlinear solitary waves. The device showed promising results in experiments and proposed a modification for analyzing soft soils.
TRANSPORTATION GEOTECHNICS
(2021)
Article
Materials Science, Multidisciplinary
Nejc Novak, Olly Duncan, Tom Allen, Andrew Alderson, Matej Vesenjak, Zoran Ren
Summary: This study analyzed the shear moduli of conventional and auxetic open-cell polymer foams, finding that the measured shear moduli of auxetic foams were generally lower, and the calculated shear moduli were lower than the measured values.
MECHANICS OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Zhijun Guo, Yizhou Huang, Chunchun Sun, Zengxing He, Delin Yuan, Bianyun Cai, Yunfeng Li, Baolong Shen
Summary: Titanium alloys are widely used as bone implants, but their long-term clinical success is compromised by challenges such as the stress shielding effect. In this study, non-toxic alloying elements zirconium (Zr) and molybdenum (Mo) were added to titanium to produce Ti-Mo-Zr alloys. The addition of Zr and Mo improved the mechanical properties of the alloys and showed higher microhardness and compressive yield strength. Ti-12Mo-10Zr exhibited the lowest Young's modulus and the alloys demonstrated good cytocompatibility and osteointegration, making Ti-12Mo-10Zr a promising material for bone repair.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Chemical
Constantin Ott, Dietmar Drummer
Summary: Foam injection molding process was used to encapsulate FR4 with Polyamid66 in order to achieve high-quality assembly production and protect against external influences. Successful tests showed low leakage rate and shear stress, demonstrating the suitability of the new solution concept.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Luis Umbelino dos Santos, Kaio Niitsu Campo, Rubens Caram, Eder Socrates Najar Lopes
Summary: In this study, the influence of oxygen content on the microstructure and mechanical properties of Ti-Nb alloys was evaluated. The results showed that increasing oxygen content slightly affected the thickness of alpha plates and beta-transus, but improved hardness and compressive yield stress. Solid-solution strengthening by Nb and oxygen, along with microstructural refinement by Nb addition, were responsible for these improvements.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Pharmacology & Pharmacy
Stephen Thomas, Hannah Palahnuk, Hossein Amini, Ilgaz Akseli
Summary: The study successfully predicted the mechanical properties of compacted powder blends using machine learning models, providing a new approach for formulation design. The models were trained with data to accurately predict Young's modulus of different mixtures, supporting Quality-by-Design in formulation design.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2021)
Article
Chemistry, Multidisciplinary
Hong Hu, Xuyun Guo, Yaokang Zhang, Zijian Chen, Lei Wang, Yuan Gao, Ziran Wang, Yuqi Zhang, Wenshuo Wang, Mingming Rong, Guoqiang Liu, Qiyao Huang, Ye Zhu, Zijian Zheng
Summary: A strategy called elasto-plastic design of an ultrathin interlayer is proposed to enhance the strain tolerance of flexible electronics. By inserting an ultrathin, stiff, and elastic interlayer between a rigid film/device and a soft substrate, the actual strain applied on the film/device can be significantly reduced when the substrate is bent.
Article
Materials Science, Multidisciplinary
Changxing Cui, Wen Zhang, Feng Wang, Yanchao Li, Benqi Jiao, Jianrong Xue, Mingming Wu, Lian Zhou, Laiping Li
Summary: The microstructure evolution and mechanical properties of hydrogenated Zircaloy-4 tubes during the thermal decomposition process of precipitated hydrides were investigated. Nanoindentation tests were used to determine the mechanical properties in different states, showing that the modulus, hardness, and yield strength were the highest for the delta-hydrides and increased at 1273K.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Diangeng Cai, Xiaotong Zhao, Lei Yang, Renxian Wang, Gaowu Qin, Da-fu Chen, Erlin Zhang
Summary: This study developed a novel near beta-titanium alloy (TNZA) with low elastic modulus and strong antibacterial ability by adding Ag element and proper microstructure controlling. The TNZA alloy exhibited good biocompatibility and strong antibacterial properties, showing potential for clinical application.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Sai Wang, Haoyang Feng, Jianming Hong, Guilong Wang
Summary: This study investigates the improvement in the foaming of thermoplastic polyurethane (TPU) by enhancing the crystallization of hard segments. The effects of packing time in MOFIM technology on the crystallization behavior of hard segments and the cell morphology of TPU foams are studied. It is found that prolonging the packing time increases the crystallinity of TPU solids and foams due to closer-packed crystals. The enhanced foamability of TPU is attributed to both increased crystallinity of hard segments and broader distribution of crystals at the same crystallinity. Moreover, TPU foams with higher hardness have smaller cell size, higher cell density, and narrower distribution in cell size due to their higher viscosity and storage modulus.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Polymer Science
Long Wang, Minghui Wu, Qian Ren, Zhengsheng Weng, Wanwan Li, Xiuyu Zhu, Wenge Zheng, Xiaosu Yi
Summary: Polypropylene/carbon nanostructure (PP/CNS) nanocomposite foams with high void fraction and good mechanical properties were successfully prepared using foam injection molding technique. The addition of carbon nanostructures improved the melt strength and crystallization process of PP, and a high mold temperature overcame the adverse effect of CNS, leading to significantly increased cell density.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
Martin Ihrig, Martin Finsterbusch, Chih-Long Tsai, Alexander M. Laptev, Chia-hao Tu, Martin Bram, Yoo Jung Sohn, Ruijie Ye, Serkan Sevinc, Shih-kang Lin, Dina Fattakhova-Rohlfing, Olivier Guillon
Summary: The study introduces a completely dry processing route for manufacturing dense composite cathodes, pure LLZ separators, and multilayers of the two through high mechanical pressure during Field-Assisted Sintering. The low sintering temperature achieved is suitable for high energy CAMs but leads to surface impurities affecting the crystallinity of the CAM/LLZ interface. Investigating the impact of resulting interfaces on ionic conductivity, interfacial impedance, and cycling stability of produced cells, an optimization strategy is proposed.
JOURNAL OF POWER SOURCES
(2021)
Article
Nuclear Science & Technology
Vishnu Ganesh, Daniel Dorow-Gerspach, Simon Heuer, Jiri Matejicek, Monika Vilemova, Martin Bram, Jan Willem Coenen, Marius Wirtz, Gerald Pintsuk, Werner Theisen, Christian Linsmeier
Summary: The differences in thermophysical properties between tungsten and steel create thermal stress peaks at the interface, which can be reduced by using a graded interlayer made of W/steel-composites. Plasma spraying and field assisted sintering technology were employed for manufacturing and bonding, followed by investigation of bonding parameters for different compositions. The optimal process parameters were identified for successfully manufacturing a tungsten-steel joint with a graded interlayer.
FUSION ENGINEERING AND DESIGN
(2021)
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
Materials Science, Ceramics
Moritz Kindelmann, Moritz L. Weber, Mark Stamminger, Rahel Buschhaus, Egbert Wessel, Martin Bram, Olivier Guillon
Summary: The study reveals an orientation dependent surface fluorination of Y2O3 in fluorine etching plasma, controlling the etching resistance and morphology formation. Orientations near the low index planes (001), (010) and (100) exhibit the lowest stability due to a homogeneous surface reaction. The presented results help to extend the mechanistic understanding of the plasma-material interaction of Y2O3.
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, Multidisciplinary
Tarini Prasad Mishra, Shufan Wang, Christian Lenser, Dylan Jennings, Moritz Kindelmann, Wolfgang Rheinheimer, Christoph Broeckmann, Martin Bram, Olivier Guillon
Summary: This paper introduces the characteristics of Ultrafast High-temperature Sintering (UHS) technology and its application in the densification of strontium titanate samples. Experimental and simulation results show that UHS can achieve extremely high heating rates, rapid densification, and the addition of iron can control grain growth and achieve uniform densification and grain growth. Electrical conductivity tests indicate that UHS sintered samples can fully exhibit the functional properties of strontium titanate.
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
Materials Science, Ceramics
Subhadip Bhandari, Tarini Prasad Mishra, Martin Bram, Olivier Guillon, Devinder Yadav
Summary: Flash sintering of 8YSZ/NiO composites was studied, and it was found that the sintering atmosphere and NiO content strongly influenced the flash onset temperature and power dissipation. The current density could control the densification of the composites.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Tarini Prasad Mishra, Lennart Leich, Martin Krengel, Sebastian Weber, Arne Roettger, Martin Bram
Summary: Electric current-assisted sintering technologies show great promise for processing NdFeB magnets, allowing for easy sintering of powders with suboptimal particle size distribution and morphology. Flash spark plasma sintering, especially when combined with external pressure, can achieve pronounced anisotropic magnetic properties. These ECAS technologies also have potential for recycling waste magnet materials and are compared to established processing technologies.
ADVANCED ENGINEERING MATERIALS
(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
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
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)
