Article
Materials Science, Multidisciplinary
Dirk Endler, Tilo Zienert, Vasileios Roungos, Jana Hubalkova, Patrick Gehre, Christos G. Aneziris
Summary: This article presents a method and results of producing alumina-tantalum composites through cold isostatic pressing from commercially available raw materials. The study found that the densification of the composites can vary with different pressure and temperature conditions. The formation of tantalum carbide and the incorporation of oxygen into the tantalum lattice were also observed.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Engineering, Manufacturing
Riccardo Tosi, Chu Lun Alex Leung, Xipeng Tan, Emmanuel Muzangaza, Moataz M. Attallah
Summary: This study systematically investigates the microstructural evolution of E-PBF/HIP Ti-6Al-4V parts and finds that the microstructure can be controlled by adjusting the porosity and pore morphology. The study also reveals that the grain morphology transitions during HIP are driven by the increase in pore volume and lack-of-fusion pores.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Caleb P. Massey, Maxim N. Gussev, Cody J. Havrilak, Rachel L. Seibert, Ercan Cakmak, Andrew T. Nelson
Summary: Impurity control is crucial when optimizing the weld quality of higher-strength material systems using ultrasonic welding. Hot-isostatic pressing improves the interfacial bond quality of Zirconium plate, but the introduction of Ti impurities during the ultrasonic additive manufacturing process may result in local delamination and the formation and growth of secondary phases, affecting the strength and fracture behavior of specimens.
ADDITIVE MANUFACTURING
(2022)
Article
Chemistry, Multidisciplinary
Di Zhang, Hongfei Lu, Nawei Lyu, Xin Jiang, Zili Zhang, Yang Jin
Summary: In this study, a method to create surface-microcracks in a Zn foil by 200 MPa cold isostatic pressing is proposed. The proposed method effectively alleviates the dendrite growth and side reactions during the repeated Zn plating and stripping, leading to high-performance zinc anodes for zinc-ion batteries. The 200 MPa Zn||Zn symmetric cell and 200 MPa Zn||VO2 full cell show excellent cycling stability.
NANOSCALE ADVANCES
(2023)
Article
Materials Science, Ceramics
Md Rokon Ud Dowla Biswas, Sangil Hyun, Sung-Soo Ryu, Dang-Hyok Yoon
Summary: This study investigated the compaction behavior and microstructural characteristics of a green ceramic component with a complex shape, finding that crack formation was influenced by stress gradient and pressure level. Various observation methods and numerical simulations were used to analyze the phenomena and provide insights into the process.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Alexander Epishin, Bettina Camin, Lennart Hansen, Marek Heuser, Inmaculada Lopez-Galilea, Benjamin Ruttert, Werner Theisen, Bernard Fedelich
Summary: In this study, hot isostatic pressing of nickel-base superalloy CMSX-4 was conducted, with porosity annihilation investigated using metallography and X-ray tomography. The experimental results were compared with a vacancy model and further refined to predict pore annihilation kinetics, aiding in the selection of optimal technological parameters.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Chemistry, Physical
M. Khomutov, A. Chereshneva, P. Petrovskiy, D. Daubarayte, V Cheverikin, A. Sova, A. Travyanov, I Smurov
Summary: Cold spraying was utilized for the deposition of AlMgScZr alloy with low-porosity deposits successfully produced. Heat treatment and hot isostatic pressing (HIP) were performed to homogenize the structure, leading to significant improvement of ultimate compressive strength and the strain at failure of the deposits.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Jakub Stec, Jacek Tarasiuk, Sebastian Wronski, Piotr Kubica, Janusz Tomala, Robert Filipek
Summary: The degradation of micropore carbon refractory materials used as lining materials in the blast furnace hearth strongly influences the lifetime of the blast furnace and the price of steel. A new investigation method of refractory materials infiltration resistance was presented in this work, combining a standard degradation test with X-ray computed tomography measurements. Through XCT measurements before and after molten metal infiltration, changes in the microstructure of the refractory material could be observed and crucial elements of the open pore structure identified.
Article
Chemistry, Analytical
A. Graefenstein, D. Brueckner, C. Rumancev, J. Garrevoet, V. Galbierz, W. H. Schroeder, C. G. Schroer, G. Falkenberg, A. Rosenhahn
Summary: 3D and 2D-cross-sectional X-ray fluorescence analysis is a powerful tool for imaging element distribution in biological material and quantifying metal homeostasis. This study presents a method using peak fitting and self-absorption correction to reconstruct the cross-sectional distribution of elements in cryogenically prepared leaves. Additionally, the authors introduce an atomographic MCA hyperspectral reconstruction method that improves quantitative analysis of light elements compared to conventional methods.
ANALYTICAL CHEMISTRY
(2023)
Review
Materials Science, Multidisciplinary
Usama M. Attia
Summary: Cold isostatic pressing is a powder-based technology used for near-net-shape production of metal and ceramic components. Despite being more commonly used with ceramics, recent developments have led to its increasing use in high-performance metal part manufacturing. The process offers advantages such as solid-state processing and low tooling cost, making it viable for niche applications in aerospace and automotive industries.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2021)
Article
Automation & Control Systems
Maxim Khomutov, Anastasia Spasenko, Alexey Sova, Pavel Petrovskiy, Vladimir Cheverikin, Andrey Travyanov, Igor Smurov
Summary: In this study, cold spray additive manufacturing technology was used to produce composite AA7075 deposits reinforced by silicon carbide particles. Different heat treatments and capsule-free hot isostatic pressing were used to homogenize the structure of the composite. The presence of SiC in the composite influenced the distribution of hardening phases in AA7075 during heat treatment.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Materials Science, Coatings & Films
P. Petrovskiy, M. Khomutov, V Cheverikin, A. Travyanov, A. Sova, I Smurov
Summary: The effect of capsule-free hot isostatic pressing (HIP) on the porosity and mechanical properties of different cold spray deposits was evaluated experimentally. The HIP post-treatment significantly decreased the porosity of 316L and pure titanium deposits, while the densification effect on porous Ti6Al4V deposits was less pronounced. Mechanical properties, including tensile and compressive strength, were improved after HIP treatment, with an explanation given for the changes in material diffusion and microstructure during the HIP cycle.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Radiology, Nuclear Medicine & Medical Imaging
Magdalena M. M. Dobrolinska, Niels R. R. van der Werf, Judith van der Bie, Joel de Groen, Marcel Dijkshoorn, Ronald Booij, Ricardo P. J. Budde, Marcel J. W. Greuter, Marcel van Straten
Summary: By changing the tube potential for different patient sizes, photon-counting computed tomography (PCCT) can systematically assess the radiation dose reduction potential of coronary artery calcium (CAC) assessments.
EUROPEAN RADIOLOGY
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Niels R. van der Werf, S. Si-Mohamed, P. A. Rodesch, R. W. van Hamersvelt, M. J. W. Greuter, S. Boccalini, J. Greffier, T. Leiner, L. Boussel, M. J. Willemink, P. Douek
Summary: CAC scores using routine clinical protocols are comparable between conventional CT and SPCCT. SPCCT showed higher detectability of CAC for both small and large phantoms, with detection increasing significantly at reduced slice thickness for both CT systems. Volume scores from SPCCT were found to be more comparable with the physical volume of the CAC compared to CT.
EUROPEAN RADIOLOGY
(2022)
Article
Cardiac & Cardiovascular Systems
Tania A. Pawade, Mhairi K. Doris, Rong Bing, Audrey C. White, Laura Forsyth, Emily Evans, Catriona Graham, Michelle C. Williams, Edwin J. R. van Beek, Alison Fletcher, Philip D. Adamson, Jack P. M. Andrews, Timothy R. G. Cartlidge, William S. A. Jenkins, Maaz Syed, Takeshi Fujisawa, Christophe Lucatelli, William Fraser, Stuart H. Ralston, Nicholas Boon, Bernard Prendergast, David E. Newby, Marc R. Dweck
Summary: In a study involving 150 patients with calcific aortic stenosis, neither denosumab nor alendronic acid showed any effect in reducing the progression of aortic valve calcification. Further research is needed to explore alternative pathways and mechanisms to identify potential disease-modifying therapies for this condition.
Article
Materials Science, Ceramics
Marc Neumann, Jana Hubalkova, Claudia Voigt, Joern Grabenhorst, Christos G. Aneziris
Summary: This study investigated the compressive and bending strength of industrially fabricated alumina foams with three different cell sizes. The impact of cell dimensions, loading rate, and specimen aspect ratio on foam structures was examined. Strength data of the open-porous alumina foams were compared using different probability distributions, with the Normal or Log-Normal distribution proving to be the best representation for most test sets.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Dirk Endler, Tilo Zienert, Vasileios Roungos, Jana Hubalkova, Patrick Gehre, Christos G. Aneziris
Summary: This article presents a method and results of producing alumina-tantalum composites through cold isostatic pressing from commercially available raw materials. The study found that the densification of the composites can vary with different pressure and temperature conditions. The formation of tantalum carbide and the incorporation of oxygen into the tantalum lattice were also observed.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Ceramics
Shihua Wang, Wen Yan, Junjie Yan, Stefan Schaffoener, Zhe Chen, Shaobai Sang
Summary: The higher sintering temperature promoted the reaction between Al(OH)(3) and kaolinite gangue, leading to the development of primary-mullite as well as the generation of secondary-mullite, which promoted the formation of the neck and improved the strength. Meanwhile, the dense mullite layers were formed continuously on the surface of Al(OH)(3) pseudomorphs, making the micropores inside the pseudomorphs become closed pores, which increased the closed porosity of the aggregates.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Qianlin Chen, Wen Yan, Junjie Yan, Stefan Schaffoener, Zhe Chen, Sanbao Ma, Guangqiang Li
Summary: In this study, microporous MgO-Al2O3 ceramics with high compressive strength and apparent porosity were successfully prepared using a wet mixing process and in situ decomposition synthesis method.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Barsheek Roy, Felix Baier, Andreas Rosin, Thorsten Gerdes, Stefan Schaffoener
Summary: This study investigated the structural chemistry of the near-surface region of soda-lime-silica (SLS) glass using X-ray photoelectron spectroscopy. The results showed variations in the concentration of bridging oxygen, non-bridging oxygen, and hydrous species as a function of depth. The presence of hydrous species, particularly associated with silanol groups, was found to be vital in determining the near-surface structure of SLS glass.
INTERNATIONAL JOURNAL OF APPLIED GLASS SCIENCE
(2023)
Article
Materials Science, Ceramics
Jonas Winkelbauer, Georg Puchas, Walter Krenkel, Stefan Schaffoener
Summary: In this study, an automated fiber spraying process was transferred to short fiber bundle-reinforced oxide fiber composites. The effect of processing factors on specimen strength was analyzed, as well as the influence of fiber length on bending stress and strain. The SF-OFC exhibited excellent quasi-ductile fracture behavior and in-plane isotropic material properties.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Eranezhuth Wasan Awin, Timon E. Guenther, Rameshwori Loukrakpam, Stefan Schaffoener, Christina Roth, Guenter Motz
Summary: Efficient and durable catalysts are crucial for the commercialization of fuel cells. This study developed amorphous silicon-based ceramics and TiN@Si-Al-C-N nanocomposites with enhanced electrocatalytic activity by controlling the pyrolysis temperature and incorporating TiN nanocrystals. The nanocomposites showed improved oxygen reduction reaction performance at higher temperatures.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Qianlin Chen, Wen Yan, Stefan Schaffoener, Han Wu, Bingqiang Han, Jinhua Zhang, Yawei Li
Summary: Microporous MgO-Mg(Al, Fe)2O4 refractory aggregates were prepared by in-situ decomposition synthesis method using magnesite, Al(OH)3 and Fe2O3. At 1400-1600 degrees C, there were two structures of Mg(Al, Fe)2O4 with Fe3+: one was a ring structure formed from Al(OH)3 pseudomorph particle as a template and a low content of Fe3+, and the other was dot and strip structures precipitated in magnesite pseudomorph particles with a high content of Fe3+. Moreover, at 1550-1600 degrees C, microporous MgO-Mg(Al, Fe)2O4 refractory aggregates showed excellent compressive strength (75.8-81.5 MPa) and apparent porosity (26.8%-28.2%).
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Multidisciplinary Sciences
Xiaojian Liao, Jakob Denk, Thomas Tran, Nobuyoshi Miyajima, Lothar Benker, Sabine Rosenfeldt, Stefan Schaffoener, Markus Retsch, Andreas Greiner, Guenter Motz, Seema Agarwal
Summary: Materials with low thermal conductivity and high electrical conductivity are required for sustainable applications in energy converters, miniaturized electronics, and high-temperature fuel cells. To achieve this, innovative design concepts that decouple phonon and electron transport are necessary. By incorporating carbon and silicon-based ceramics into electrospun nonwovens, we achieved a unique combination of thermal and electrical conductivity, which can inspire the design of similar materials.
Article
Materials Science, Ceramics
Stefan Flauder, Nico Langhof, Walter Krenkel, Stefan Schaffoener
Summary: This study investigates the influence of three C/C-SiC pad materials with different compositions on frictional performance. The results show that the Si and SiC contents of the pad materials have a significant impact on the friction behavior. However, while the wear rates differ, only marginal differences were found for the coefficient of friction. Furthermore, the formation of an intermediate metallic transfer layer from the steel disk on the ceramic pads was discovered through additional tests.
Article
Materials Science, Ceramics
Serhii Yaroshevskyi, Piotr Malczyk, Christian Weigelt, Jana Hubalkova, Steffen Dudczig, Uwe Lohse, Christos G. Aneziris
Summary: This study investigates 3D-printed fine-grained refractory ceramics suitable for use in contact with liquid steel. The researchers developed thermal debindable ceramic filaments that can be printed without the need for any chemical solvent pre-debinding. The study demonstrates the optimal debinding and sintering processes, resulting in printed products with excellent form stability and reproducibility. The printed products exhibit outstanding thermal-shock performance due to the designed inner geometry and micro-porosity introduced during debinding. The mechanical properties of the printed samples were also evaluated, proving their suitability for applications in contact with molten steel.
CERAMICS-SWITZERLAND
(2023)
Article
Materials Science, Ceramics
Matteo Mor, Matthias Meiser, Nico Langhof, Antonio Vinci, Simone Failla, Bettina Alber-Laukant, Stephan Tremmel, Stefan Schaffoener, Diletta Sciti
Summary: The tribological behavior of ultra-high temperature ceramic matrix composites (UHTCMCs) in friction applications was investigated. The surface microstructures and wear mechanisms were analyzed. The materials showed stable braking performance and wear against C/C-SiC disks, and formed a stable friction film when in contact with steel disks, reducing wear and stabilizing the braking performance. The high coefficient of friction, stability during braking, and acceptable wear rate make these materials appealing for automotive brake applications.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Carla Malinverni, Milena Salvo, Alessandro De Zanet, Fabiana D'Isantoa, Federico Smeacetto, Pierre Bertrand, Georg Puchas, Stefan Schaffoner, Valentina Casalegno
Summary: This work focuses on the joining processes of oxide-based ceramic matrix composites (Al2O3f /Al2O3-ZrO2), which are used as radiant tube furnace components in the steel industry. These components have to operate in harsh environments, and they therefore have to resist corrosion, humidity, and combustion. Two glass-ceramics systems, which have Y2Ti2O7 as their main crystalline phase, as well as specific and optimized properties to withstand severe operating conditions, including temperatures of 900 degrees C, are proposed as joining materials. The adhesion of the glass-ceramics to the composite was found to be excellent after mechanical and thermal tests in which they were in direct contact with a 900 degrees C flame and thermal cycling of between 400 degrees C and 900 degrees C.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Elmar Galiev, Ricardo Tran, Sven Winter, Felix Lindner, Georg Puchas, Cornell Wuestner, Mandy Thomas, Stefan Knohl, Verena Psyk, Stefan Schaffoener, Walter Krenkel, Verena Kraeusel
Summary: In this study, the performance of a novel hybrid structure with improved insulation capability for the heat-forming process of automotive and aerospace components was investigated. Experimental results validated the mechanical stability and good insulation capabilities of the hybrid insulation.
Article
Engineering, Manufacturing
Felix Wich, Stefan Flauder, Natalie Schneider, Michael Fleck, Nico Langhof, Walter Krenkel, Stefan Schaffoener
Summary: This study investigates the influence of hexamethylenetetramine (hexa) content on the rheological features, pyrolysis reactions, mass-loss kinetics, and char yield of phenolic resins. The results show that increasing hexa content leads to lower curing temperatures, higher viscosity, and increased residual carbon. The findings suggest a hexa-induced microgel formation in phenolic resins. The developed viscosity and char yield models offer a valuable tool for customizing resin-hardener mixtures for specific applications and contribute to a better understanding of the pyrolysis process.
ADVANCED MANUFACTURING-POLYMER & COMPOSITES SCIENCE
(2023)
Article
Materials Science, Ceramics
Dan Zhao, Yi Feng, Zhipeng Pi, Fan Zhang
Summary: Phase equilibria in the ZrO2-GdO1.5-TaO2.5 (ZGTO) system were experimentally investigated, and the differences between ZGTO and the existing ZrO2-YO1.5-TaO2.5 (ZYTO) were discussed. The study is useful for thermodynamic assessment of ZGTO and can guide the design of novel thermal barrier coatings materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yutaka Ohya, Wingki Mey Hendra, Chika Takai-Yamashita, Takayuki Ban
Summary: Diffusion couples of rutile and corundum single crystals were prepared and examined to study the solid solution and precipitation of corundum in rutile during cooling. Different precipitation forms of corundum were observed under different cooling conditions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiaming Zhan, Yunfa Guo, Hao Wang
Summary: This study systematically investigates the mechanical behaviors of calcium fluoride in humid environments. The effects of water on the deformation and plastic enhancement of CaF2 under indentation are explored through microindentation experiments, atomic simulations, and Raman spectroscopy measurement.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hangfeng Zhang, Henry Giddens, Theo Graves Saunders, Matteo Palma, Isaac Abrahams, Haixue Yan, Yang Hao
Summary: The relationship between low and high frequency tunabilities in tin substituted barium titanate ceramics was investigated. It was found that there are differences in tunabilities at different frequencies due to the different activities of larger ferroelectric domains and polar nanoclusters.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Kaibiao Xi, Jiacheng Liu, Beibei Song, Huarong Cheng, Yihao Li, Xiaole Yu, Mupeng Zheng, Mankang Zhu, Yudong Hou
Summary: Composite modulation in the superparaelectric state of the BTBZ-CT system is proposed as an effective strategy to achieve both NTCC and excellent energy storage performance in dielectric ceramics. The addition of BZ and CT to BT ferroelectrics can move the SPE state to the normal use temperature zone, resulting in enhanced NTCC characteristics and energy storage performance. Furthermore, intentional precipitation of CT at grain boundaries can refine the grain size, increase the bandgap, and strengthen the local electric field distribution, thereby enhancing the breakdown electric field.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hamed Salimkhani, Lovro Fulanovic, Till Froemling
Summary: The demand for robust multilayer ceramic capacitors with high-temperature and high-power capabilities is increasing rapidly. However, cost-effective production is a challenge. This study investigates the use of Na0.5Bi0.5TiO3-based materials as promising lead-free options. By adding sintering aids, the sintering temperature of Na0.5Bi0.5TiO3-BaTiO3-CaZrO3-BiAlO3 solid solutions was successfully reduced to 975 degrees C, suitable for co-sintering with Cu electrodes without adverse effects on capacitor properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Mingxing Li, Ran Mo, Zeshui Xu, Jie Zhou, Conglin Zhang, Xuefeng Cui, Fang Ye, Laifei Cheng, Ralf Riedel
Summary: Polymer infiltration and pyrolysis is an effective method for preparing ceramic matrix composites. The transformation of polymer to ceramic during the process affects the residual stress and interface behavior in the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yan Kang, Lin Chen, Chang-Jiu Li, Guan-Jun Yang
Summary: A novel abradable seal coating with low hardness and high bonding strength was successfully designed and prepared. This coating has significantly higher abradability and erosion resistance compared to metal-based coatings, and can retain excellent abradability and have a long lifetime during service.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Qingzhong Song, Xiangdong Zha, Ming Gao, Yingche Ma
Summary: This study analyzes the influence of calcia refractory purity on the properties of calcia crucibles. Higher purity calcia results in well-developed grains and improved hydration resistance, leading to better high-temperature strength and thermal shock resistance. In contrast, lower purity calcia crucibles exhibit inferior properties. Therefore, high-purity calcia is considered a potential refractory for manufacturing oxide crucibles.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sehreish Abrar, Faisal Nazeer, Zhuang Ma, Ling Liu, Abdul Malik, Mustafa Kamal, Abdullah G. Al-Sehemi
Summary: To raise the operating temperature of Si-based ceramic matrix composites (CMCs), researchers have applied thermal/environmental barrier coating (T/EBCs) materials, typically rare earth silicates. However, the high thermal conductivity and the mismatch of thermal expansion have been major challenges in developing new materials that can offer thermal insulation and environmental protection to CMCs. In this study, entropy engineering was used to create a multicomponent equi-atomic single-phase pyro silicate with extremely low thermal conductivity and enhanced water vapor corrosion resistance. The research findings show the potential of high entropy disilicates in achieving ultra-low thermal conductivity and low weight loss in corrosive environments.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zi-bo Niu, Daxin Li, Dechang Jia, Zhihua Yang, Kunpeng Lin, Paolo Colombo, Ralf Riedel, Yu Zhou
Summary: In this study, SiBCN ceramics with a special structure were prepared to improve the oxidation resistance. The effect of the structure on oxidation behavior and kinetics was investigated, revealing that the special structure can effectively inhibit heterogeneous oxidation and enhance the oxide layer composition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Melike Donmez, Metehan Erdogan, Cihangir Duran
Summary: The limited densification of CeO2 ceramics was improved by using an anorthite-based glass, resulting in high dielectric constant and quality factor with minimum dielectric loss. The CeO2-(anorthite-based) glass ceramic showed promising results in terms of low temperature densification and microwave properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
S. Rahmati, R. G. A. Veiga, J. Mostaghimi, T. Coyle, A. Dolatabadi
Summary: This study provides an atomic-scale description of the high-velocity impact of alpha-Al2O3 particles onto an alpha-Al2O3 substrate during Aerosol Deposition (AD). The results suggest that the crystal orientation plays a crucial role in both plasticity and damage of the nanoparticles. Impact velocity has a direct correlation with plasticity and fragmentation, but adhesion efficiency has only a marginal increase. The crucial element lies in the substrate's surface alterations caused by the fragments left on the substrate after impact.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Bo-Wen Chen, Yan-Mei Kan, De-Wei Ni, Chun-Jing Liao, Hong-Da Wang, Yu-Sheng Ding, Shao-Ming Dong
Summary: This study characterized the long-term and repeated ablation properties of modified Cf/HfC-SiC composites with YB4-Al2O3-Si3N4 under an air plasma torch. The structural stability and viscosity of the oxide layer were found to affect the ablation resistance of the composites. By forming nano c-HfO2 grains and high-viscosity Al-Si-Y-O glassy phase, the structural stability of the oxide layer was improved, resulting in enhanced ablation resistance. However, the oxidation of Si3N4 led to the formation of NO, NO2, and excessive SiO2 glassy phase, which resulted in a porous structure and reduced the viscosity of the oxide layer. Therefore, the addition of Si3N4 decreased the ablation resistance of the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yongxing Wei, Huawei Zhang, Siyuan Dong, Changqing Jin, Chenxing Bai, Junle Dai, Zengzhe Xi, Zhonghua Dai, Zengyun Jian, Li Jin
Summary: In this study, solid solutions of xBi(Ni1/2Hf1/2)O-3-(1 - x)PbTiO3 (xBNH-PT) were synthesized to investigate their phase boundary behaviors and physical properties. The presence of a tetragonal-pseudocubic phase boundary and a spontaneous ferroelectric-relaxor transition at specific compositions were confirmed. The introduction of a tetragonal-pseudocubic phase boundary improved the piezoelectric properties and suppressed the spontaneous ferroelectric-relaxor transition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
