Article
Materials Science, Ceramics
Steven M. Smith II, William G. Fahrenholtz, Greg E. Hilmas, Tieshu Huang
Summary: Dual-phase, high-entropy boride-carbide ceramics were densified by pressureless sintering, achieving relative densities up to approximately 96%. Isostatic pressing at 200 MPa resulted in higher relative densities of both the green bodies and final ceramics compared to uniaxial pressing. The highest relative density of 96.3% was achieved for a ceramic that was isostatically pressed at 200 MPa and sintered at 2300 degrees C for 2 h, with grain sizes of approximately 2 mu m. This is the first report of pressureless sintering of dual-phase, high-entropy boride-carbide ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Douglas E. Wolfe, Patrick E. Albert, Caillin J. Ryan, Justin A. Reiss, Sergei P. Stepanoff, Petr A. Kolonin
Summary: By optimizing the FAST processing conditions, dense (Hf,Ta)C ceramics without the need for sintering aids can achieve high mechanical properties, primarily influenced by solid solution strengthening and the Hall-Petch effect.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Fernando Rodriguez-Rojas, Victor Zamora, Fernando Guiberteau, Angel L. Ortiz
Summary: B4C-SiC-TiB2 ceramic composites with equal volume fractions of the three phases (i.e., 1B4C-1SiC-1TiB2) were successfully fabricated by solid-state spark-plasma sintering (SPS). The optimized SPS-ed composite exhibited a triplex-particulate microstructure with evenly distributed carbide and boride grains, and showed ultrahardness and relatively high toughness. It also demonstrated an unprecedented super wear resistance to unlubricated sliding contact.
CERAMICS INTERNATIONAL
(2023)
Review
Materials Science, Multidisciplinary
Yue Zhou, Kathy Lu
Summary: This review focuses on polymer-derived nonoxide materials, a type of attractive high-temperature ceramics. It traces the history of using polycarbosilane (PCS) polymer melt spinning to synthesize silicon carbide (SiC) fibers. The process of SiC formation from polymer precursors to microcrystalline ceramics is examined, and the parameters related to PCS pyrolysis are explained. The review also covers solid-solution carbides, transition metal carbides, transition metal borides, boride composites, and nitride materials. The versatility and exciting properties of these materials, such as mechanical and thermal properties, electrical conductivity, electromagnetic shielding, and charge storage capability are discussed. The review provides an overview of applications and concludes with a summary and outlook.
ADVANCED ENGINEERING MATERIALS
(2023)
Review
Chemistry, Physical
Yan Wang, Yao Nian, Akash N. Biswas, Wei Li, You Han, Jingguang G. Chen
Summary: 2D transition metal carbides and nitrides (MXenes) are emerging as promising candidates for heterogeneous electrocatalysis due to their unique properties. Ongoing efforts in developing MXenes and MXene-derived electrocatalysts for various electrochemical reactions offer new possibilities for sustainable energy conversion.
ADVANCED ENERGY MATERIALS
(2021)
Article
Materials Science, Ceramics
Elizaveta P. Simonenko, Nikolay P. Simonenko, Eugeniy K. Papynov, Oleg O. Shichalin, Anton A. Belov, Ilya A. Nagornov, Philipp Yu Gorobtsov, Nikolay T. Kuznetsov
Summary: The potentials of producing ceramic materials Ta4HfC5 and Ta4HfC5-30 vol% SiC at relatively low temperatures (1700 and 1800 degrees C) were studied through reactive spark plasma sintering of highly dispersed powders Ta2O5-HfO2-C and Ta2O5HfO2-C-SiC. The introduction of silicon carbide not only stimulated the consolidation process and the formation of a solid solution with Ta4HfC5 composition, but also increased the oxidation resistance of the carbide ceramics. Oxidation resistance of the obtained ceramic materials was evaluated by thermal analysis and exposure to laser radiation in atmospheric air.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
P. V. Istomin, I. M. Belyaev, E. I. Istomina, A. V. Nadutkin, V. E. Grass
Summary: The study on leucoxene-derived Ti3SiC2-TiB2-(TiC)-SiC composites reveals their high potential as promising structural ceramics.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Eric W. Neuman, Gregory E. Hilmas, William G. Fahrenholtz
Summary: Three phase boride and carbide ceramics exhibit remarkably high hardness values, which vary with the composition and indentation load.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Steven M. Smith, Lun Feng, William G. Fahrenholtz, Greg E. Hilmas, Tieshu Huang
Summary: In this study, a fine-grained dual-phase boride-carbide high-entropy ceramic was successfully synthesized using a sequential carbo/borothermal process. By converting part of the carbide to boride through carbothermal reduction, a composition similar to 29 vol% boride was obtained. Solid solution formation occurred at high temperature, resulting in high density and hardness.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Sichao Li, Amanda S. Barnard
Summary: This paper presents a method to predict the chemical formula of MXenes based on battery performance criteria. By using a new categorical descriptor and multiple target regression and classification, specific MXene formulas with desired electrochemical properties are identified.
CHEMISTRY OF MATERIALS
(2022)
Article
Materials Science, Ceramics
Yuki Jimba, Sosuke Kondo, Hao Yu, Haoran Wang, Yasuki Okuno, Ryuta Kasada
Summary: A new sintering process called TLPDS has been developed for high-melting-point borides, using a eutectic TiB-Ti powder as the sintering aid. This approach has successfully improved the sinterability of TiB2.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Yao Li, Yu Wang, Guo-Hua Zhang
Summary: As main candidates in the field of ultra-high temperature ceramics, high entropy carbides/borides (HECs/HEBs) exhibit good oxidation resistance, high hardness, and excellent thermal and electrical conductivities, which are currently the focus of research. In this study, (Hf,Ta,Zr,Nb,Mo,Ti)C and (Hf,Ta,Zr,Nb,Mo,Ti)B-2 powders were successfully synthesized using a three-step process. XRD and SEM characterizations confirmed the successful preparations of face-centered cubic HECs and hexagonal HEBs. The facile synthesis route shows great potential for industrial-scale production of high entropy phase powders.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Review
Materials Science, Ceramics
K. A. Kane, B. A. Pint, D. Mitchell, J. A. Haynes
Summary: This review examines the need for materials capable of withstanding oxidation at ultrahigh temperatures, evaluating the performance of various ultra-high temperature ceramics in terms of oxidation resistance for specific applications.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Physics, Applied
I Dirba, C. K. Chandra, Y. Ablets, J. Kohout, T. Kmjec, O. Kaman, O. Gutfleisch
Summary: In this study, alternative materials systems with high magnetization and low anisotropy are investigated for their potential in delivering enhanced heating power in magnetic fluid hyperthermia. The performance of iron-nitrogen (Fe-N), iron-boron (Fe-B) and iron-carbon (Fe-C) compounds is compared to conventional iron oxides. The findings show that materials with high magnetization but low anisotropy provide the best combination for maximizing the specific loss power (SLP) in alternating magnetic fields.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Ceramics
Yongqiang Tan, Wei Liao, Zhen Teng, Xiaosong Zhou
Summary: A novel technique to lower the synthesis temperature and maintain the mechanical properties of high-entropy carbides was proposed. The introduction of carbon vacancies and reaction with boron carbide led to the formation of high-entropy boride phase, which significantly improved the mechanical properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(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)