Article
Materials Science, Ceramics
Ji-Hwoan Lee, Byung-Nam Kim, Byung-Koog Jang
Summary: The transparent Y2O3 ceramics were fabricated using a two-step pressure and heating profile, which improved shrinkage behavior and achieved sufficient density without excessive coarsening. As a result, the normalized real in-line transmittance was 80.6% at 1100 nm, close to the theoretical transmittance of 81.6%. The two-step SPS profile proved to be advantageous in manufacturing ceramics with transparency and densification.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Nanoscience & Nanotechnology
Charles Manierea, Joseph Sambasene Diatta, Christophe Couder, Christelle Harnois, Sylvain Marinel
Summary: This study proposes a combined master sintering curve and regression method to determine all sintering model parameters. It introduces the original method of estimating the grain size curve and its impact on the densification kinetics at the final stage. The results show good agreement between the model and experimental data points.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Ceramics
Jie Liang, Xuetong Zhao, Shenglin Kang, Jing Guo, Zhiling Chen, Yuli Long, Qian Zeng, Jianjie Sun, Lijun Yang, Ruijin Liao, Clive A. Randall
Summary: In this work, a hybrid cold sintering/spark plasma sintering (CSP-SPS) process is demonstrated for densifying and controlling grain growth in ZnO ceramics. The CSP-SPS process achieves high densities (>98%) at lower temperatures (200-300 ℃) and exhibits mild grain coarsening.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Rubia Hassan, Kantesh Balani
Summary: The sintering mechanisms of ZrB2 and SiC-reinforced ZrB2 ceramic composites were investigated by determining the activation energy of densification in different temperature ranges. The results showed that the addition of SiC changed the prominent densification mechanism and impacted the mechanical performance with systemic increase of sintering temperature.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Ceramics
Gyeonghun Kim, Jungsu Ahn, Sangjoon Ahn
Summary: The study examined the spark plasma sintering behavior of uranium mononitride synthesized by the hydride-nitride process, revealing two regimes in the sintering process based on temperature. At lower temperatures, pellet density increased with temperature to a maximum value, while grain growth was insignificant. On the other hand, at higher temperatures, rapid achievement of maximum density and significant grain growth were observed.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Zhiyong Wang, Jianping Wang, Yongsai Xu, Mingdong Yi, Guangchun Xiao, Zhaoqiang Chen, Jingjie Zhang, Hui Chen, Chonghai Xu
Summary: The impact of sintering rate on the microstructure and mechanical properties of cermets was explored using ultrafast sintering. The results showed that an appropriate heating rate could achieve rapid densification and inhibit abnormal grain growth, leading to excellent mechanical properties in (Ti, W)C cermets.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Congcong Zhao, Dabiao Xia, Guangmeng Yang, Na Wang, Chuanyu Cui, Qi Lu, Haowei Deng
Summary: In this study, a W-0.5SiC composite material was prepared by thoroughly mixing 0.5 wt% SiC nano particles and pure tungsten powders using ball milling, followed by the sintering process using Spark Plasma Sintering (SPS). The effect of sintering temperature on the microstructure and mechanical properties of the W-0.5SiC composite was investigated. It was found that the sintering process led to the formation of tungsten carbide (W2C) and silicon oxide (SiO2) phases at the grain boundaries. The grain size of the composite increased with increasing sintering temperature. Parameter fitting based on the grain growth power law suggested that the grain growth of the W-0.5SiC composite during the SPS process was mainly controlled by surface diffusion. The 1800°C sintered W-0.5SiC composite exhibited a hardness of 342.2 +/- 4.3 HV and a compressive strength of 1417 +/- 137 MPa. The deformation behavior of the 1800°C sintered W-0.5SiC composite was investigated using the digital image correlation technique during compressive testing, revealing crack formation at the sample edge or near the surface. The cracks extended parallel to the loading direction and propagated throughout the entire sample in less than 0.2 s.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Damien Bregiroux, Julie Cedelle
Summary: The study found that by controlling the sintering temperature during SPS, ZnS ceramics with small grain size and almost full density could be obtained, but higher temperatures could lead to grain growth, affecting mechanical properties. Keeping the grain size below 100 nm appears to be the key to developing high-performance ZnS functional ceramics.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Metallurgy & Metallurgical Engineering
Mei Zhang, Wen-jun Wang, Tie-chui Yuan, Si-yao Xie, Rui-di Li, Zhi-hui Zhou, Yun-bao Xu
Summary: Dense B4C material was fabricated using spark plasma sintering method, and the mechanisms of densification and grain growth were investigated. The results show that there are two sintering periods, densification period and grain growth period, and the mechanisms involve grain boundary sliding, dislocation climb, grain boundary diffusion and volume/liquid-phase diffusion.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Materials Science, Multidisciplinary
Pavel Andreev, Pavel Drozhilkin, Lyudmila Alekseeva, Ksenia Smetanina, Elena Rostokina, Stanislav Balabanov, Maksim Boldin, Artem Murashov, Gleb Shcherbak
Summary: The ceramic samples made from silicon nitride (Si3N4) powder mixtures fabricated by spark plasma sintering were investigated. Wet chemical methods were used to prepare the powder mixtures from commercial alpha-Si3N4 powder and Y2O3-Al2O3 sintering additive. The sintering process, powder mixtures, and ceramic samples were characterized, and the properties such as density, microhardness, and fracture toughness were measured. The amount of sintering additive affected the shrinkage temperature and the amount of beta-Si3N4 in the ceramics.
Article
Materials Science, Ceramics
L. Audouard, M. G. Tsoutsouva, N. Horezan, E. Rimpot, J. F. Justin, P. Bertrand, C. Langlade, M. Garcia, A. Julian-Jankowiak
Summary: This study investigated the Spark Plasma Sintering (SPS) of fully stabilised hafnia with yttrium oxide (yttria) and examined the influence of manufacturing parameters on the crystallography, chemistry, and microstructure of the material. It was found that both the amount of yttria and the sintering temperature affected the final composition, lattice parameter, and microstructure of hafnia-based materials. Regardless of the amount of yttrium employed, the main phase was determined to be Y2Hf2O7 with high densification levels.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Haobo Shi, Mei Yu, Jianhua Liu, Jie Wang, Haodong Yang, Songmei Li
Summary: Proper grain boundary density can improve the growth rate and thickness of the anodic film, while excessive grain refinement may lead to an increase in grain boundary density and weaken the final anodic film thickness.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Sebastian Diaz-de-la-Torre, Isaac Munoz-Juarez, Jose C. Mendez-Garcia, Gisela Gonzalez-Corral, Mariano Casas-Luna, Edgar B. Montufar, Carolina Oliver-Urrutia, Maria Cristina Pina-Barba, Ladislav Celko
Summary: This study investigates the possibility of manufacturing dense and nanocrystalline hydroxyapatite (HA) large monoliths using spark plasma extrusion (SPE). The results show that binder-free extrusion of pre-compacted HA powder is feasible at temperatures similar to those at which nanocrystalline HA exhibits superplastic behavior. The extrusion process involves sliding, rotation, and grain boundary sliding of particles to produce monoliths with specific dimensions and alignment. The dehydration and smooth surface of the powder are important factors for facilitating additive-free HA extrusion. The extruded HA preserves its stoichiometry, nanometric grain size, and preferential microstructural alignment.
NANOTECHNOLOGY REVIEWS
(2022)
Article
Materials Science, Ceramics
Moritz Kindelmann, Ke Ran, Wolfgang Rheinheimer, Koji Morita, Joachim Mayer, Martin Bram, Olivier Guillon
Summary: Cation doping of Y2O3 affects the densification and grain growth during sintering. La3+ segregation to the grain boundary results in decreased sintering activity and reduced grain growth coefficient, while Gd3+ shows no significant effect on densification. The elastic component of segregation plays a vital role in influencing grain boundary migration rates and sintering kinetics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Jeong Hyun Kim, Myeongjun Ji, Jongmin Byun, Young-Keun Jeong, Sung -Tag Oh, Young-In Lee
Summary: This study successfully synthesized W-Y2O3 composite powders with uniformly dispersed Y2O3 nanoparticles using ultrasonic spray pyrolysis and subsequent hydrogen reduction, demonstrating excellent properties and purity.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Ceramics
Shogen Matsumoto, Yuko Kaneda, Akihiko Ito
CERAMICS INTERNATIONAL
(2020)
Article
Materials Science, Ceramics
Akihiko Ito, Masato Sekiyama, Tomohiro Hara, Takashi Goto
CERAMICS INTERNATIONAL
(2020)
Article
Materials Science, Multidisciplinary
Akihiko Ito, Yuki Morishita
Article
Materials Science, Multidisciplinary
Shogen Matsumoto, Akihiko Ito
OPTICAL MATERIALS EXPRESS
(2020)
Article
Materials Science, Ceramics
Liqiong An, Linying Wang, Longfei Wang, Runhua Fan, Akihiko Ito, Takashi Goto
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Materials Science, Multidisciplinary
Kazuki Kato, Ryuta Watanuki, Akihiko Ito
Article
Materials Science, Multidisciplinary
Jianchao Chen, Akihiko Ito, Takashi Goto
Article
Materials Science, Multidisciplinary
Honoka Aida, Ryuta Watanuki, Akihiko Ito
Article
Materials Science, Ceramics
Linying Wang, Ligiong An, Jin Zhao, Shunzo Shimai, Xiaojian Mao, Jian Zhang, Juan Liu, Shiwei Wang
Summary: In this study, porous alumina with high porosity and high strength was prepared by a popular direct foaming method using particle-stabilized wet foam. The stability of wet foams was found to increase with increasing DTAC content, while it decreased with increasing PAA content. The resulting porous alumina ceramics exhibited high porosity, fine grain size, and good compressive strength.
JOURNAL OF ADVANCED CERAMICS
(2021)
Article
Materials Science, Ceramics
Liqiong An, Longfei Wang, Runhua Fan, Jian Zhang, Takashi Goto, Shiwei Wang
Summary: Lu-2(Ti1-xHfx)(2)O-7 transparent ceramics were fabricated with varying Hf content, showing structural changes, increased density and lattice parameter with higher Hf content, and a decrease in average grain size. The ceramics exhibited dense microstructures and good in-line transmittance, with electrical conductivity also influenced by Hf content.
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2021)
Article
Engineering, Electrical & Electronic
Longfei Wang, Liqiong An, Guohong Zhou, Xingang Wang, Kai Sun, Hetuo Chen, Hongtao Hou
Summary: A series of AlN/FeSiAl composite ceramics with different FeSiAl content were fabricated by pressureless sintering. The effects of FeSiAl content on the properties of the composite ceramics were investigated. The results showed that an appropriate FeSiAl content can improve the microwave absorption and mechanical properties of the composite ceramics, indicating their potential for various applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Physics, Applied
Akihiko Ito, Shogen Matsumoto
Summary: This review discusses the advantages of thick film scintillators in radiation detection and imaging, and introduces a novel chemical vapor deposition process for the direct and rapid synthesis of these scintillators.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Ceramics
Yuri Mitsuhashi, Shogen Matsumoto, Akihiko Ito
Summary: The eutectic structure in metals and ceramics is a self-organization phenomenon where multiple solid phases solidify in an ordered structure from a liquid phase. Ordered structures of Y3Al5O12 (YAG)-Al2O3 composites were prepared via chemical vapor deposition in the YAG-Al2O3 eutectic system. This study reveals that ordered structures can be formed not only during the melt-solidification process but also during the vapor deposition process.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Shogen Matsumoto, Shunsuke Kurosawa, Daisaku Yokoe, Teiichi Kimura, Akihiko Ito
Summary: A chemically deposited eutectic (CDE) of Lu3Al5O12 (LuAG)-Al2O3 with Ce3+ doping has been synthesized, which exhibits green emissions under UV light and alpha-/X-ray irradiations and can be used as an X-ray phosphor screen. X-ray radiograph of the semiconductor storage device was successfully obtained using a 15-μm-thick Ce3+:LuAG-alpha-Al2O3 CDE film.
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)
