Article
Materials Science, Ceramics
Wiktor Niemiec, Przemyslaw Szczygiel, Zbigniew Olejniczak, Miroslaw Handke
Summary: The research demonstrates that the distribution of carbon atoms has a significant impact on the structure of silicon oxycarbide based materials and can be utilized to customize materials for specific purposes.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Jakub Marchewka, Piotr Jelen, Izabela Rutkowska, Patryk Bezkosty, Maciej Sitarz
Summary: This study aimed to synthesize porous ceramic materials from the SiOC system using the sol-gel method and subsequent pyrolysis, controlling pore size and surface area crucial for potential applications. The study found that Si/C ratio significantly impacts material properties, with the porous ceramics having a wide range of potential applications.
Article
Chemistry, Physical
Magdalena Gaweda, Piotr Jelen, Maciej Bik, Magdalena Lesniak, Maciej Sowa, Wojciech Simka, Monika Golda-Cepa, Monika Brzychczy-Wloch, Zbigniew Olejniczak, Marek Nocun, Maciej Sitarz
Summary: In this study, hermetic layers based on amorphous SiOC modified with cerium ions were deposited on steel substrates, improving corrosion resistance. However, the modification did not promote the release of Ce ions, and the materials did not exhibit antibacterial properties.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Chemical
Mouna Hecini, Meftah Tablaoui, Salaheddine Aoudj, Baya Palahouane, Ouahiba Bouchelaghem, Samia Beddek, Nadjib Drouiche
Summary: The study demonstrates that recycling the waste slurry from wire sawing of silicon ingot into wafers for the preparation of sodium silicates precursor to synthesize silica gel is an economical method to manage waste. The process of recycling SiC involved liquid-liquid extraction and alkali dissolution, ultimately resulting in a powder mixture containing 28% Si and 72% SiC. The alkali dissolution process using sodium hydroxide was optimized to react with silicon in the slurry waste to prepare the Na2SiO3 precursor for the synthesis of silica xerogel.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Byeolnim Oh, Jun-Sung Oh, Eun-Jung Lee, Cheol-Min Han
Summary: The study showed that using an acid/base combinatorial catalyst system can significantly reduce the gelation time of silica hydrogel and improve the uniform dispersion of graphene oxide (GO). The silica/GO composite hydrogel exhibited a wide range of mechanical properties, making it a potential platform for stem cell culture or stretchable gel applications.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Congcong Rong, Jianan Zhang, Song Chen, Yixuan Wang, Toshiyuki Ikoma, Xiaona Li, Weiyi Chen
Summary: Silica hollow microspheres were prepared as biocompatible cell carriers using emulsified gelatin microspheres as sacrificial templates. SEM observations showed their spherical morphology with a hollow structure and a diameter of 50-200 μm. FT-IR spectrum revealed the presence of Si-O-Si bonds. Gelatin microspheres served as supporting matrix and sacrificial templates for the formation of hollow structure. The silica hollow microspheres were found to be biocompatible and supported cell attachment and proliferation when seeded with osteoblast MC3T3-E1 cells, indicating their potential as biocompatible cell carriers.
Article
Chemistry, Physical
Maria Owinska, Paulina Matoga, Piotr Jelen, Elzbieta Dlugon, Bartosz Handke, Wiktor Niemiec
Summary: The study showed that bifunctional monomers in silicon oxycarbide precursors can form volatile oligomers, affecting carbon availability during annealing; an uneven distribution of carbon-rich mers may lead to free-carbon phase formation instead of carbon incorporation. A novel two-step approach using a macromonomer prevents small siloxane ring formation and has a limited number of possible combinations of structural units neighboring each silicon atom.
Article
Biochemistry & Molecular Biology
Julia C. C. Steinbach, Fabio Fait, Hermann A. A. Mayer, Andreas Kandelbauer
Summary: This study focuses on the synthesis and properties of hybrid organic/inorganic nanocomposites. A quantitative model with high robustness and predictive power was established, demonstrating the complex nonlinear behaviors and partly synergistic interactions between process factors in determining the material properties.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Materials Science, Ceramics
Otavio Rovere Bittencourt, Ingrid Vicente Farias, Flavio Henrique Reginatto, Leliz Ticona Arenas, Herica Aparecida Magosso, Alexandre Luis Parize
Summary: The presence of micropollutants in springs in Brazil and other countries has been detected. This study reports the synthesis and characterization of a xerogel-based adsorbent for the removal of the emerging contaminant ethinylestradiol. The adsorbent showed high adsorption capacity, thermal stability, and good regeneration ability.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Yu-Hsuan Chang, I. -Chia Huang, Shao-Yung Huang, Yen-Ku Wu, Hsin-Yun Hsu
Summary: Researchers have developed a facile and green method to produce disulfide-linked redox-responsive silica nanoparticles through photo-crosslinking coupled sol-gel reaction. The reaction is template-free, initiated by visible light irradiation, and can be controlled to achieve desired particle size and morphology by adjusting the concentration of silica precursors, photosensitizer, and irradiation time. The current findings provide insights for future development of stimuli-responsive silica-based materials.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Chemistry, Applied
Rui Tian, Junzhang Wang, Zhou Xu, Xingzhong Guo, Wei Lei, Ronghua Ding, Yun Zhang, Hui Yang
Summary: The study fabricates a high-performance SiOC anode with bi-continuous macropores and robust skeletons, which exhibits milder volume change, high reversibility and stability, providing a promising fundamental material for achieving long-cycle SiOC anode materials.
JOURNAL OF POROUS MATERIALS
(2023)
Article
Polymer Science
Dongxiao Hu, Gaofeng Shao, Jun Wang, Aleksander Gurlo, Maged E. Bekheet
Summary: The complex nanodomain structures of graphene-PDC composites can be revealed by embedding reduced graphene oxide into silicon oxycarbide, resulting in a composite material with ordered and continuous graphene layers embedded in an amorphous SiOC phase.
Article
Engineering, Chemical
Shoya Kobayashi, Noriko Yamauchi, Shohei Tada, Yoshio Kobayashi
Summary: Silica-coated titanium nitride (TiN/SiO2) particles were synthesized using a sol-gel method and the hardness of the sintered bodies fabricated with these particles was evaluated. The presence of few micropores in the TiN/SiO2 structure resulted in particles with small specific surface areas. The Vickers hardness increased in the order: TiN < TiN-SiO2 < TiN/SiO2A < TiN/SiO2S. The SiO2 shell acted as a sintering aid and the NaOH catalyst improved the density and hardness of the sintered body.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Chemistry, Physical
Adele R. Latypova, Maxim D. Lebedev, Ilya A. Tarasyuk, Alexander I. Sidorov, Evgeniy V. Rumyantsev, Artur S. Vashurin, Yuriy S. Marfin
Summary: A one-step synthesis method for organomodified silica materials using a special surfactant DDAO was developed in this study, eliminating the need for heat treatment. SEM images revealed that all obtained materials had similar spherical morphology with a particle diameter of about 500 nm. The catalytic activity experiments showed that the amino-modified matrix exhibited the highest activity, while the phenyl-modified matrix demonstrated low activity due to hydrophobic interactions hindering product diffusion.
Article
Materials Science, Ceramics
Abolhassan Najafi, F. Golestani-Fard, H. R. Rezaie, Saviz Parsa Saeb
Summary: SiC-B4C nano powders were synthesized through sol-gel process in water-solvent-catalyst-dispersant system. The formation mechanism of the product during sol-gel process was evaluated using TEM, SEM, DTA/TG, BET, XRD, FTIR and DLS analysis methods. The nanoparticles had a high surface area and meso porous surfaces, with SiC-B4C particles in the range of 20-40 nm.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Li Yao, Wenqiang Yang, Shixiang Zhou, Hui Mei, Yang Li, Konstantinos G. Dassios, Ralf Riedel, Chidong Liu, Laifei Cheng, Litong Zhang
Summary: This study proposes a scalable parametrization-design methodology for multifunctional microwave-absorbing (MA) metamaterials. It combines theoretical calculation, simulation predictions, and experimental verification. By utilizing polymer-derived ceramics as substrate materials and mathematical modeling of triply-periodic-minimal-surfaces shellular structures, tunable electromagnetic response is achieved. The fabricated [111]-oriented Gyroid shellular MA metamaterials exhibit superior performance in the X-Ku band with wide-temperature adaptability.
Article
Chemistry, Physical
Xingmin Liu, Dan Xu, Hui Ding, Marc Widenmeyer, Wenjie Xie, Maximilian Mellin, Fangmu Qu, Guoxing Chen, Ye Shui Zhang, Zhenyu Zhang, Aasir Rashid, Leopoldo Molina-Luna, Jan P. Hofmann, Ralf Riedel, Dan J. L. Brett, Anke Weidenkaff
Summary: In this study, multiscale designed Co-Mn-O spinel smart pre-catalysts were developed for the conversion of waste plastics. The carbon nanotube composites (CNCs) showed excellent catalytic performance and high H-2 yield. Density functional theory calculations suggested that the Co/MnO catalyst had excellent activity in the dissociation of alkanes. This work provides a new recipe and insights for developing advanced catalysts for waste plastic conversion.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Multidisciplinary
Xingmin Liu, Heqiang Liu, Hongjing Wu, Qian Zhou, Hongsheng Liang, Guoqiang Liu, Wenyan Duan, Yue Gu, Chengying Xu, Nahum Travitzky, Paolo Colombo, Ralf Riedel
Summary: In this work, ceramic-based structural EM metamaterials are developed by utilizing innovative methods such as AM, precursor infiltration and pyrolysis (PIP), and hydrothermal methods. The resulting ceramic nanocomposites exhibit ultra-broad effective absorption bandwidth (EAB) of 35 GHz and high bending strength of approximately 327 MPa, which are the highest values reported for ceramics of this type that have been 3D-printed.
Article
Energy & Fuels
Yongchao Chen, Tianshu Jiang, Chuanmu Tian, Ying Zhan, Alexander Kempf, Leopoldo Molina-Luna, Jan P. Hofmann, Ralf Riedel, Zhaoju Yu
Summary: A facile and cost-effective approach using single-source precursors (SSPs) to prepare active and durable bifunctional electrocatalysts consisting of core-shell structured transition metal phosphide (TMPs) nanoparticles dispersed and immobilized in a highly defective N-, P-codoped carbon matrix is proposed. The obtained FeNiP@NPC-900 catalyst exhibits promising electrocatalytic performance for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), with low overpotentials. The unique core-shell nanostructure of FeNiP@NPC-900 protects the catalytically active phase and synergistically promotes the activity performance.
Article
Materials Science, Ceramics
Yanqin Fu, Yulei Zhang, Hao Yan, Jinhua Li, Xuemin Yin, Jia Sun, Qiangang Fu, Ralf Riedel
Summary: Polymer-derived ultra-high-temperature ceramic (UHTC) nanocomposites with hafnium carbide (HfC) whiskers were successfully fabricated using a novel carbon nanotube (CNT) template growth mechanism. The CNTs served as templates for the HfC whiskers, which were synthesized by the release of low-molecular-weight gases during the pyrolysis of a Hf-containing precursor. The resulting products consisted of inner single crystal HfC whiskers and outer HfC/HfO2 particles.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Materials Science, Ceramics
Wei Li, Zhaoju Yu, Leonore Wiehl, Tianshu Jiang, Ying Zhan, Emmanuel I. I. I. Ricohermoso, Martin Etter, Emanuel Ionescu, Qingbo Wen, Christian Lathe, Robert Farla, Dharma Teppala Teja, Sebastian Bruns, Marc Widenmeyer, Anke Weidenkaff, Leopoldo Molina-Luna, Ralf Riedel, Shrikant Bhat
Summary: This research reports the high-pressure synthesis and characterization of a γ-Si3N4/Hf3N4 ceramic nanocomposite, which has superhardness and high thermal stability and is a competitive candidate for technological applications in harsh conditions.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Materials Science, Ceramics
Yuchen Liu, Yu Zhou, Dechang Jia, Zhihua Yang, Wenjiu Duan, Daxin Li, Shuzhou Li, Ralf Riedel, Bin Liu
Summary: Using ab-initio calculations, the atomic structure and mechanical properties of amorphous silicoboron carbonitride ceramics with 13 different compositions in the Si-BN-C phase diagram were investigated. The chemical bonds and local structures in the amorphous network are dependent on the elemental composition. The mechanical properties of SiBCN ceramics are greatly influenced by their local structural characteristics. SiB2C3N2 and SiB3C2N3 with low Si contents and moderate C and/or BN contents exhibit high elastic moduli, high tensile/shear strengths, and good debonding capability. The optimization of SiBCN ceramics can be guided based on these discoveries.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Materials Science, Ceramics
Marco Melzi d'Eril, Andrea Zambotti, Magdalena Graczyk-Zajac, Emanuel Ionescu, Gian Domenico Soraru, Ralf Riedel
Summary: The manufacturing of a proper anode material is a challenging factor for the development of Sodium-Ion-Batteries (SIB). This study investigates the feasibility of using a low-cost ultra-fast high-temperature pyrolysis process to convert polymer-derived SiOC aerogel into ceramic anode material. The electrochemical performance of the resulting ceramics is tested and compared, revealing different capacities.
Article
Materials Science, Multidisciplinary
Apurv Dash, Koji Morita, Luca Balice, Robert Muecke, Olivier Guillon
Summary: This article demonstrates the enhanced plasticity of gadolinium-doped ceria (GDC) ceramics under mild and strong AC electric current, in terms of steady state creep rate under both compressive and tensile loading. A current density of 25 and 200 mA mm(-2) is used for the creep deformation, and the creep rate increases by up to two orders of magnitude under electric current. The stress exponent remains unchanged for creep experiments at 1200 °C with and without electric current, suggesting a grain boundary sliding (GBS) mechanism of plastic deformation in both cases. The field-enhanced creep rate is attributed to the interaction of space-charge layer and the electric field resulting in enhanced GBS. A higher current density results in enhanced ductility of GDC even when the Joule heating effect is compensated by reducing the furnace temperature.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yongchao Chen, Tianshu Jiang, Chuanmu Tian, Ying Zhan, Esmaeil Adabifiroozjaei, Alexander Kempf, Leopoldo Molina-Luna, Jan P. Hofmann, Ralf Riedel, Zhaoju Yu
Summary: A simple and environmentally friendly method was used to synthesize novel nanocomposites, MoP quantum dots (QDs) were used as cores and graphitic carbon as shells. These nanoparticles were dispersed in nitrogen and phosphorus-doped porous carbon and carbon nanotubes substrates. The synthesized sample, MoP@NPC/CNT-900, showed remarkable electrocatalytic activity and durability for the hydrogen evolution reaction in both 0.5 M H2SO4 and 1 M KOH solutions.
Article
Green & Sustainable Science & Technology
Orevaoghene Eterigho-Ikelegbe, Emmanuel Ricohermoso III, Hamza Harrar, Ralf Riedel, Samson Bada
Summary: The objective of this study was to investigate the microstructure and performance of coal composites produced from coal-based waste (CBW) and polysiloxane polymer (SPR-212). The results showed that the intensity of C=C bonds in the CBW impacts the pyrolysis mass loss and shrinkage of the composites. The composites have a continuous operating temperature of up to 600 degrees C, but composites with carbon content above 36% exhibited significant degradation. The findings lay the foundation for further development of high-quality structural coal composites from CBW and SPR-212 preceramic polymer.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2023)
Article
Engineering, Multidisciplinary
S. Alamdari, O. Mirzaee, M. J. Tafreshi, R. Riedel
Summary: This article reports the development of a portable and flexible gallium doped zinc oxide/polystyrene/cellulose nanocomposite for applications in water treatment and renewable energy. The nanocomposite showed efficient decolorization and destruction of dye molecules under different exposure conditions. The hybrid material can be easily used in flexible luminescent devices and water treatment, and the photocatalyst can be easily eliminated after wastewater treatment.
COMPOSITES PART B-ENGINEERING
(2023)
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
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
Zi-bo Niu, Daxin Li, Dechang Jia, Zhihua Yang, Kunpeng Lin, Dong Wang, Yunpeng He, Guoxiang Zhou, Paolo Colombo, Ralf Riedel, Yu Zhou
Summary: The chemical reactions and structural changes during the transformation of the precursor into PDCs-SiBCN ceramic were investigated in this study. The crystallization behaviors of PDCs-SiBCN and MA-SiBCN ceramics at different temperatures were compared. It was found that the different amorphous structures in PDCs-SiBCN and MA-SiBCN ceramics resulted in different bonding of silicon atoms, leading to different resistance to crystallization.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
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)
