Article
Materials Science, Ceramics
Monika Tatarkova, Peter Tatarko, Alexandra Kovalcikova, Ivo Dlouhy, Jan Dusza, Pavol Sajgalik
Summary: The addition of h-BN nanosheets during spark plasma sintering process improved the fracture toughness and strength of Si3N4, while slowing down the alpha -> beta phase transformation. Proper control of the particle size and content of h-BN nanosheets can effectively enhance the mechanical properties of Si3N4.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Zhankai Liu, Bing Yan, Shengyan Meng, Rui Liu, Wen-Duo Lu, Jian Sheng, Yanhui Yi, An-Hui Lu
Summary: The study found that N2-treated hexagonal boron nitride showed remarkable activity with good selectivity towards propane, while O2 treatment led to sintering effect of BOx species which suppressed the catalytic performance.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Eli Janzen, Hannah Schutte, Juliette Plo, Adrien Rousseau, Thierry Michel, Wilfried Desrat, Pierre Valvin, Vincent Jacques, Guillaume Cassabois, Bernard Gil, James H. Edgar
Summary: The changes in the properties of hexagonal boron nitride (hBN) induced by isotopic purification are reported. The study extends the purification to N-15 isotopes. Raman and photoluminescence spectroscopies show that the monoisotopic hBN crystals exhibit similar vibrational and optical properties to N-14 purified hBN. The growth of high-quality h(10)B(14)N, h(11)B(14)N, h(10)B(15)N, and h(11)B(15)N crystals opens up new possibilities for thermal conductivity control and advanced functionalities in quantum technologies.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Guihua Li, Lei Chen, Yulong An, Meizhen Gao, Huidi Zhou, Jianmin Chen
Summary: This work investigated the effect of polytetrafluoroethylene (PTFE) on the tribological properties and corrosion resistance of epoxy/hydroxylated hexagonal boron nitride (EP/OH-h-BN) composite coatings. The results showed that the addition of PTFE significantly reduced the friction coefficient and wear rate, and increased the corrosion resistance of the coating. The improvement in coating properties was attributed to the synergistic strengthening effect of OH-h-BN and PTFE.
Review
Chemistry, Multidisciplinary
Soumyabrata Roy, Xiang Zhang, Anand B. Puthirath, Ashokkumar Meiyazhagan, Sohini Bhattacharyya, Muhammad M. Rahman, Ganguli Babu, Sandhya Susarla, Sreehari K. Saju, Mai Kim Tran, Lucas M. Sassi, M. A. S. R. Saadi, Jiawei Lai, Onur Sahin, Seyed Mohammad Sajadi, Bhuvaneswari Dharmarajan, Devashish Salpekar, Nithya Chakingal, Abhijit Baburaj, Xinting Shuai, Aparna Adumbumkulath, Kristen A. Miller, Jessica M. Gayle, Alec Ajnsztajn, Thibeorchews Prasankumar, Vijay Vedhan Jayanthi Harikrishnan, Ved Ojha, Harikishan Kannan, Ali Zein Khater, Zhenwei Zhu, Sathvik Ajay Iyengar, Pedro Alves da Silva Autreto, Eliezer Fernando Oliveira, Guanhui Gao, A. Glen Birdwell, Mahesh R. Neupane, Tony G. Ivanov, Jaime Taha-Tijerina, Ram Manohar Yadav, Sivaram Arepalli, Robert Vajtai, Pulickel M. Ajayan
Summary: Hexagonal boron nitride (h-BN) is a strong candidate for two-dimensional (2D) materials due to its exciting optoelectrical properties, combined with mechanical robustness, thermal stability, and chemical inertness. Various synthesis strategies for 2D h-BN, including chemical exfoliation, chemical, and physical vapor deposition, have been developed in recent years. The potential applications of h-BN structures in nanoelectronics, photonics, biomedical, anti-corrosion, and catalysis are described based on their extraordinary properties and stability.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Qiang Li, Mingdi Wang, Yunhe Bai, Qifan Zhang, Haoran Zhang, Zhenhuan Tian, Yanan Guo, Jingping Zhu, Yuhuai Liu, Feng Yun, Tao Wang, Yue Hao
Summary: This study investigates the film stripping process of hexagonal boron nitride (hBN) films using liquid phase exfoliation and spin coating. The transferred hBN films demonstrate a constant resistance window and show potential for application in resistive switching devices.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Yunjo Jeong, Ossie Douglas, Utkarsh Misra, Md Rubayat-E Tanjil, Kenji Watanabe, Takashi Taniguchi, Michael Cai Wang
Summary: Electromigration in metal interconnects is a significant challenge in scaling integrated circuits to smaller nodes. This study introduces a facile and effective approach to mitigate electromigration in copper interconnects by passivation with insulating monolayer 2D hexagonal boron nitride (hBN), resulting in significantly improved performance.
ADVANCED ELECTRONIC MATERIALS
(2021)
Article
Automation & Control Systems
Joseph Agyapong, Solomon Hanson Duntu, Aleksander Czekanski, Solomon Boakye-Yiadom
Summary: This study investigates the microstructural evolution and mechanical properties of cemented carbides reinforced with hexagonal boron nitride (h-BN). The addition of h-BN at a low concentration improves the densification and hardness of the cemented carbides, while a high concentration leads to the formation of pores and microcracks. XRD analysis shows that the addition of h-BN prevents the formation of undesired phases.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Fangsong Guo, Shanrong Li, Can Yang, Jinshui Zhang, Yidong Hou, Xinchen Wang
Summary: This study addresses the low stability issue of nitride-based materials for photocatalytic oxidation reaction and achieves highly crystallized hexagonal boron carbon nitride with improved performance. The highly crystallized BCN exhibits enhanced photocatalytic activity and long-term anticorrosion stability, showing great potential for solar energy applications.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Mahmut Can Senel, Mevlut Gurbuz
Summary: In this study, hexagonal boron nitride nanoparticulates and graphene nanoplatelets reinforced aluminum matrix composites were produced via powder metallurgy process. The mechanical properties, including density, hardness, and compressive strength, were significantly improved in composites with 1%BN and 0.15%graphene content. However, exceeding these contents resulted in decreased mechanical strength due to the aggregation of graphene nanoplatelets and nano-BN particles.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Xiaofang Zhang, Lulu An, Changning Bai, Li Chen, Yuanlie Yu
Summary: Hexagonal boron nitride quantum dots (BNQDs) show excellent properties and potential applications in disease diagnosis, fluorescence imaging, etc., but face challenges in large-scale fabrication. This article summarizes the properties, fabrication methods, and applications of BNQDs, aiming to inspire new methods for achieving homogeneous BNQDs at scale.
MATERIALS TODAY CHEMISTRY
(2021)
Article
Chemistry, Physical
Caiyun Liu, Le Chen, Yun Kang, Xuemei Tang, Wei Gao, Hong Yin
Summary: This work investigates the effect of post-thermal annealing on the microstructure and electrical properties of the interfacial layer in c-BN films. It is found that the annealing causes a phase transition and re-orientation of the interfacial layers, leading to improved band gap and mobility of the film. Furthermore, the c-BN/Si heterojunction after annealing demonstrates rectifying performance at room temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Xuemei Li, Zhengyang Li, Luqiao Qi, Yuyang Long, Baowen Li, Jidong Li, Jianxin Zhou, Yan Shi, Jun Yin, Wanlin Guo
Summary: A dry transfer method for monolayer h-BN film grown on copper surface is proposed, which significantly enhances its oxidation resistance and improves its stability and reliability compared to wet transfer methods.
SCIENCE CHINA-MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Vidur Raj, Dipankar Chugh, Lachlan E. Black, M. M. Shehata, Li Li, Felipe Kremer, Daniel H. Macdonald, Hark Hoe Tan, Chennupati Jagadish
Summary: Research has shown that wafer-scale, few monolayers thick hBN as a passivation layer can significantly improve solar cell performance, with a relatively low interface defect density and potential for high-quality passivation. hBN-based passivation layers are especially useful in cases where the growth of lattice-matched passivation layers is complicated.
NPJ 2D MATERIALS AND APPLICATIONS
(2021)
Review
Materials Science, Ceramics
Muhammad Ramzan Abdul Karim, Muhammad Awais Khan, Atteeq Uz Zaman, Azhar Hussain
Summary: Hexagonal boron nitride (h-BN)-based composites have versatile and significantly improved properties, making them highly valuable in various industries. This review article critically examines the crystal structure and enhanced properties of h-BN, as well as the fabrication methods, mechanical properties, and applications of h-BN-based ceramics and composites with different materials. The results show that hot pressing enhances mechanical properties through the incorporation of BN, while pressureless sintering leads to poor mechanical properties due to porosity and poor bonding between h-BN grains. These findings provide valuable insights for the development and application of h-BN-based materials.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Anton Salomon, Mykhaylo Motylenko, David Rafaja
Summary: The formation of reaction layers between corundum-based (Al2O3 + C) filter materials covered with functional Al2O3-C coatings having different carbon contents and molten steel 42CrMo4 is investigated at the reaction temperature of 1600 degrees C. Different layers are formed during the reaction process, starting with an amorphous reaction layer, followed by the formation of nanocrystalline phases and eventually a dense corundum layer with attached platelets. The effect of carbon content in the functional Al2O3-C coating on the nucleation and growth of corundum platelets is also discussed.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Dmitry Tsurkan, Paul Simon, Christian Schimpf, Mykhaylo Motylenko, David Rafaja, Friedrich Roth, Dmytro S. Inosov, Anna A. Makarova, Izabela Stepniak, Iaroslav Petrenko, Armin Springer, Enrico Langer, Anton A. Kulbakov, Maxim Avdeev, Artur R. Stefankiewicz, Korbinian Heimler, Olga Kononchuk, Sebastian Hippmann, Doreen Kaiser, Christine Viehweger, Anika Rogoll, Alona Voronkina, Valentin Kovalchuk, Vasilii V. Bazhenov, Roberta Galli, Mehdi Rahimi-Nasrabadi, Serguei L. Molodtsov, Yvonne Joseph, Carla Vogt, Denis V. Vyalikh, Martin Bertau, Hermann Ehrlich
Summary: The study focuses on designing new composite materials using extreme biomimetics with the development of a new spongin-atacamite composite material. The structure of the material is confirmed through various experimental techniques, suggesting multifunctional applicability for the development of 3D constructed sensors, catalysts, and antibacterial filter systems.
ADVANCED MATERIALS
(2021)
Article
Thermodynamics
Mario J. Kriegel, Marius H. Wetzel, Andre Treichel, Olga Fabrichnaya, David Rafaja
Summary: The study shows that under high pressure conditions, the homogeneity ranges of TiFe and TiFe2 extend to higher titanium concentrations, while the phase boundaries on the iron-rich side are not affected by pressure. The accuracy of experimental data was verified by comparing with literature data.
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
(2021)
Article
Thermodynamics
Martin Reli, Nela Ambrozova, Marta Valaskova, Miroslava Edelmannova, Libor Capek, Christian Schimpf, Mykhaylo Motylenko, David Rafaja, Kamila Koci
Summary: The study found that Fe8Ce2 is the most active photocatalyst, both in standalone powder form and attached on vermiculite, for hydrogen production via water splitting. The photocatalytic activity of Fe2O3/CeO2 photocatalysts is controlled by intrinsic photocatalytic properties of the oxides and the specific surface area of the composite. The formation of heterojunction Type I with bent bands effectively inhibits the recombination of photogenerated charge carriers.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Materials Science, Multidisciplinary
S. Martin, A. Weidner, C. Ullrich, C. Schimpf, M. Motylenko, R. Lehnert, H. Biermann, D. Rafaja, A. Vinogradov, Y. Estrin
Summary: This article explores the microstructural evolution and deformation mechanisms of high-alloy austenitic steel, demonstrating the impact of twin nucleation process on the strain hardening behavior. Experimental data and model predictions provide insights into the enhanced plasticity of the steel, with general guidelines for austenitic steel design established based on the findings.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Mechanical
L. Haus, M. Wildfeuer, J-E Grochowski, J. Wockel, M. Muller, F. Kohn, W. Schulz, C. Wustefeld, D. Rafaja, J. Albrecht
Summary: In this study, wear-resistant tungsten carbide thin films were deposited on steel substrates using magnetron sputtering in a mixed atmosphere. The excess carbon in the hard material layer was found to reduce the coefficient of friction by up to 40%, while increasing the volume of wear. Adjusting the acetylene supply and bias voltage influenced the film's composition and mechanical properties.
Article
Crystallography
Alina Schramm, Martin Thummler, Olga Fabrichnaya, Simon Brehm, Jakob Kraus, Jens Kortus, David Rafaja, Christiane Scharf, Christos G. Aneziris
Summary: The aim of this study is to investigate the technological synthesis of MgAlON as a coating material for ceramic foam filters in the filtration of metal melts. The synthesis is carried out by calculating the thermodynamics and using different fractions of Al2O3, MgO, and AlN as starting materials. The influence of the components' quantity on the conversion degree is evaluated, along with the effect of holding time and composition points on the reaction. XRD analysis is performed to determine phase fractions and lattice parameters, and the applicability of the material is evaluated through sessile drop tests.
Article
Biochemistry & Molecular Biology
Marta Valaskova, Pavel Lestinsky, Lenka Matcjova, Katerina Klemencova, Michal Ritz, Christian Schimpf, Mykhailo Motylenko, David Rafaja, Jakub Belik
Summary: This study investigates the performance of hematite catalysts prepared through precipitation methods in the catalytic oxidation of methane. The results show that hydrohematites with smaller particle size and larger lattice volume, containing structurally incorporated water and vacancies, have a positive influence on the oxidation of methane.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Physical
Chao Liu, Anne Guenther, Yuanbin Deng, Anke Kaletsch, Mathias Herrmann, Christoph Broeckmann
Summary: Researchers investigated the curvature and stress distribution in metal-ceramic laminates (MCLs) using analytic solutions and FE simulations, finding that the CTE and height ratio have a greater influence on curvature, and the interface significantly prevents curvature, providing insights for avoiding delamination during the manufacturing process.
Article
Materials Science, Multidisciplinary
Stefan Neumann, Azita Rezvani, Matthaeus Barasinski, Georg Garnweitner, Doris Segets, David Rafaja
Summary: This paper presents a multiscale approach using transmission electron microscopy (TEM) to study the characteristics of gold nanocrystals (NCs). The approach combines high-resolution TEM to observe the atomic-scale features of NCs with a semi-automatic analysis of low-magnification high-angle annular dark-field scanning TEM images to provide statistical information about the morphological attributes of NCs. The results of these complementary techniques are combined and correlated to quantify and understand the crystallographic orientations, configurations, and defects of different types of gold nanocrystals.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Christian Schimpf, Jonas Lachmann, Marius H. Wetzel, Peter D. B. Fischer, Andreas Leineweber, David Rafaja
Summary: This article introduces an escape room focused on materials science and crystallography, aiming to increase students' interest in these fields. The escape room appeals to participants with varying backgrounds through its variable difficulty and gameplay duration, and imparts lasting knowledge through reflection.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2023)
Article
Chemistry, Physical
Matthias Krause, Mareen Hoppe, Carlos Romero-Muniz, Alvaro Mendez, Frans Munnik, Aurelio Garcia-Valenzuela, Christian Schimpf, David Rafaja, Ramon Escobar-Galindo
Summary: The stability of transparent conductive oxide SnO2:Ta (1.25 at% Ta) thin films was studied under isothermal conditions at 650°C and 800°C in air. The elemental composition and optical spectra remained unchanged after high-temperature treatment. X-ray diffraction confirmed the preservation of a single rutile-type phase. The presence of point defects, identified as Sn vacancies and O interstitials, was observed but did not affect the material's transmittance and reflectance.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Computer Science, Interdisciplinary Applications
Ulrike Ratayski, Christian Schimpf, Christina Wuestefeld, Anke Dalke, Horst Biermann, David Rafaja
Summary: The stability of an iron nitride compound layer formed by plasma nitriding of AISI D2 tool steel was investigated using in situ high-temperature X-ray diffraction. The compound layer decomposes and forms an alpha-Fe 'black' layer, with the decomposition process occurring in two steps.
ENGINEERING REPORTS
(2022)
Article
Computer Science, Interdisciplinary Applications
Anke Dalke, Tom Weinhold, Alexander Schramm, Christina Wuestefeld, Ulrike Ratayski, Vjaceslav Sochora, Horst Biermann, David Rafaja
Summary: The duplex treatment of plasma nitriding and physical vapor deposition improves the performance of forming tools. This study investigates the influence of nitriding on conventionally heat-treated tool steel and discusses the effect of the compound layer. Various characterization techniques reveal the relationships between different layers.
ENGINEERING REPORTS
(2022)
Article
Chemistry, Inorganic & Nuclear
Manuel Feig, Lev Akselrud, Mykhaylo Motylenko, Matej Bobnar, Joerg Wagler, Kristina O. Kvashnina, Volodymyr Levytskyi, David Rafaja, Andreas Leithe-Jasper, Roman Gumeniuk
Summary: Yb3Co4Ge13 is the first example of a Remeika phase with a unique crystal structure. Slight adjustments in its chemical composition lead to changes in the crystal structure, with Yb ions exhibiting different intermediate valence states at different temperatures.
DALTON TRANSACTIONS
(2021)
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)
