Article
Materials Science, Ceramics
Julie Simeon, Florent Lebreton, Laure Ramond, Nicolas Clavier, Guillaume Bernard-Granger
Summary: The sintering behavior of freeze-granulated UO2-PuO2 powders with different Pu content was studied, revealing that densification was controlled by grain boundary diffusion and grain growth by the grain boundaries. The sintered microstructure of samples with 98% density exhibited a homogeneous distribution of plutonium and uranium cations, independent of the Pu content.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Fan Zhang, Han Zhang, Huizhong Zhao, Jiulin Xu
Summary: This work investigated the phase composition and microstructure evolution of Al2O3-TiO2-CaO composite materials by sintering titanium-ferroalloy smelting slag. The results showed that with the increase of sintering temperature, the composition of the material changed and the sintering effect was improved, leading to improved mechanical properties.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Serhii Parkhomenko, Anton Balabanov, Oleksandra Kryzhanovska, Nadiia Safronova, Ihor Vorona, Andrii Doroshenko, Olena Vovk, Olga Vashchenko, Alexander Tolmachev, Roman Yavetskiy
Summary: The influence of annealing temperature in the range of 600-1200 degrees C on the mesostructure and properties of Y2O3:Yb3+ green bodies was investigated. It was found that annealing at the maximum possible temperatures without approaching particle centers is necessary for sintering. Green bodies annealed at 800 degrees C showed optimal mesostructure, resulting in the highest densification efficiency during subsequent vacuum sintering.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Xinxi Zeng, Bingcheng Luo, Han Zhang, Xiaoqing Xi, Bo Li, Ji Zhou
Summary: This paper investigates the terahertz responses of Gamma 4 in rare-earth orthoferrite GdFeO3 ceramics, manipulated using thickening and thermal methods. The study showed that with increased thickness, peak heights of both ferromagnetic resonances and antiferromagnetic resonances increased while noise was reduced. Additionally, thermal control led to a blue shift in resonant frequencies and increased peak heights for both resonances.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Jingyang Li, Jun Yu, Huizhong Zhao, Shaobai Sang, Han Zhang, Yu Wang
Summary: Ferro-titanium slag can improve the mechanical properties of multiphase materials and inhibit the thermal decomposition of AT ceramic. The Si4+, Fe3+, and Ti4+ ions in ferro-titanium slag can form a solid solution with the Al3+ ions in AT, while the phase reconstruction of ferro-titanium slag can further enhance the mechanical properties of AT ceramic.
Article
Chemistry, Multidisciplinary
Xiulan He, Shilong Wang, Tai Jin
Summary: Nitrogen-doped nano TiO2 powder was prepared using the solvothermal method. The powder was loaded on the porous ceramic carriers through vacuum impregnation, and the effects of water content and carrier pore size on the microstructure and photocatalytic activity were investigated. Results showed that introducing 25% deionized water improved the crystallinity and photocatalytic properties of the nitrogen-doped nano TiO2 powder. Distorting the lattice and inhibiting grain growth enhanced its photocatalytic activity. The supported TiO2 on porous ceramic carriers showed improved absorption and photocatalytic activity due to the transmission channel and good absorbing effect of the carrier pores, especially the 20 PPI carrier with high porosity and suitable strength. The supported TiO2 could be easily recycled and reused.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Materials Science, Ceramics
Dan Han, Jian Zhang, Peng Liu, Dewen Wang, Junping Wang, Shiwei Wang
Summary: This study investigates the effects of pre-sintering atmosphere on the densification process, microstructure evolution, and final optical quality of transparent MgO∙nAl2O3 ceramics. It is found that samples pre-sintered in air exhibit uniform microstructure but may develop non-cubic precipitates after HIP treatment, while samples pre-sintered under vacuum form a large-grain layer on the surface without non-cubic precipitates.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
S. G. Huang, J. Vleugels, B. Tunca Altintas, J. H. Huang, B. Lauwers, J. Qian
Summary: The study investigated the influence of WC and Ti(C0.7N0.3) content on the microstructure and mechanical properties of NbC solution matrix cermets. Results showed that the variation in WC and Ti(C0.7N0.3) content significantly affected the phase composition, in-situ formed (Nb,W,Ti,Mo)(C,N) solution grain growth, and mechanical properties.れ
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Kyungtaek Lee, Manisha Sahu, Sugato Hajra, Kalyani Mohanta, Hoe Joon Kim
Summary: Tin oxide is a n-type semiconductor material with superior properties used in gas sensors for warning and detection of dangerous gases. The sintering temperature significantly affects the grain size and dielectric properties of tin oxide, thereby influencing gas sensing behavior. Among different sintering temperatures, 1200°C displays the best gas-sensing performance with high response and low limit of detection.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Van-Huy Nguyen, Mehdi Shahedi Asl, Seyed Ali Delbari, Quyet Van Le, Abbas Sabahi Namini, Joo Hwan Cha, Sea-Hoon Lee, Ho Won Jang, Mohsen Mohammadi, Mohammadreza Shokouhimehr
Summary: The addition of SiC significantly enhanced the sintering behavior of the ZrB2-hBN composite, leading to near fully dense material. The role of SiC in oxide removal was found to be the chief cause in improving the sinterability of the ZrB2-SiC-hBN sample.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Yanqiu Jing, Qiang Liu, Xinyu Mao, Sha Su, Xiaoying Li, Xin Liu, Yagang Feng, Xiaopu Chen, Jiang Li
Summary: The influence of CaO content on the microstructure and optical quality of MgAl2O4 ceramics was investigated. CaO was found to significantly promote the sintering process, but an excessive amount led to the occurrence of secondary phase grains, which reduced the optical quality.
Article
Materials Science, Ceramics
A. D. Timoshenko, O. O. Matvienko, A. G. Doroshenko, S. Parkhomenko, I. O. Vorona, O. S. Kryzhanovska, N. A. Safronova, O. O. Vovk, V. N. Baumer, I Matolinova, S. Hau, C. Gheorghe, R. P. Yavetskiy
Summary: YAG:Sm3+ transparent ceramics with 3-15 at.% Sm3+ doping were prepared by solid-state reactive sintering. The effect of samarium ions concentration on the microstructure and optical properties of the ceramics was investigated. It was found that the solubility limit of samarium ions in the garnet matrix was within the range of 9-11 at.%. The absorption coefficients corresponding to Sm3+ ions transitions increased linearly with increasing Sm3+ doping, and the intensities of the satellites and the broadening of the main spectral lines also increased with the concentration of Sm3+ ions. Highly-doped YAG:Sm3+ ceramics with 9 at.% Sm3+ ions showed low optical losses at 808 nm and a high absorption coefficient at 1064 nm, making them suitable for suppressing parasitic oscillations in YAG:Nd3+ lasers at 1064 nm.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Xiao-Tong Jia, Zhao-Hui Zhang, Tian-Hao Xu, Luo-Jin Liu, Yuan-Hao Sun, Xian-Yu Li, Qiang Wang, Zhao-Hu Jia, Yang-Yu He, Xing-Wang Cheng
Summary: Aluminum oxynitride ceramics doped with different sintering aids were synthesized, and their microstructures, mechanical, and optical properties were investigated. The results showed that the optimal amount of sintering aids was 0.06 wt% La2O3 + 0.16 wt% Y2O3 + 0.30 wt% MgO. The addition of La3+ and Mg2+ decreased grain boundary migration, promoted pore elimination, and inhibited grain growth. The addition of Y3+ facilitated liquid-phase sintering. Furthermore, the addition of Mg2+ effectively promoted twin formation, hindering crack propagation and dislocation motion. The doped AlON ceramic exhibited excellent mechanical and optical properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Guangyu Dong, W. Li
Summary: Co-doped Al2O3 ceramics with Cu/Ti/Mg can effectively reduce the sintering temperature and achieve high density and uniform microstructure at 1150 degrees C, but higher temperature may lead to abnormal grain growth.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Kohei Aminaka, Junichi Tatami, Motoyuki Iijima, Takuma Takahashi, Tsukaho Yahagi
Summary: In this study, high-transparency α-SiAlON ceramics were fabricated by adding various rare-earth oxides, and their effects on transparency and fluorescence were investigated. The use of Ho2O3 as an additive resulted in the lowest light scattering and highest in-line transmittance. These transparent α-SiAlON ceramics also exhibited fluorescence corresponding to different rare-earth ions.
CERAMICS INTERNATIONAL
(2022)
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)