Article
Materials Science, Ceramics
Vladimir Prajzler, Karel Maca, Premysl St'astny, Richard Todd
Summary: The study found that in flash sintered 3YSZ ceramics, the microstructural homogeneity decreased with increasing direct current density and dwell time in a flash state, eventually leading to abnormal grain growth.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Chun Liu, Aiyang Wang, Tian Tian, Lanxin Hu, Wenchao Guo, Qianglong He, Jingjing Xie, Weimin Wang, Hao Wang, Zhengyi Fu
Summary: Dense tantalum carbide ceramics were prepared via spark plasma sintering, with high temperature and pressure promoting sintering densification but also resulting in increased grain size. The ceramics achieved high density and fine grain size when sintered at 1800 degrees C for 10 minutes under 80 MPa, with Vickers hardness, Young's modulus, and fracture toughness values of 15.60 GPa, 512.66 GPa, and 3.59 MPa∙m1/2, respectively. The dominant densification mechanisms were diffusion and grain boundary sliding, with an apparent activation energy of 252.94 kJ/mol.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Camille Perriere, Remy Boulesteix, Alexandre Maitre, Alain Jalocha
Summary: This paper aims to investigate the role of calcium as a sintering aid in the production of YAG ceramics through a reaction-sintering process. The study reveals that the solubility limit of calcium is approximately 0.065 +/- 0.015 at% at a temperature of 1700 degrees Celsius. When the calcium content exceeds this value, the formation of CaAl12O19 crystallized precipitates with a melting temperature close to 1850 degrees Celsius is observed. Regardless of its content, calcium segregates at grain boundaries, which significantly hinders the densification and grain growth kinetics of YAG ceramics. This phenomenon is explained by the solute-drag mechanism caused by the segregation of complex Ca2+- V..O clusters with low mobility at grain boundaries. Overall, calcium proves to be an effective sintering additive in limiting grain growth in YAG ceramics, thereby preventing the formation of intragranular porosity, which is crucial for the production of highly transparent ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Shu Yao, Yongsheng Liu, Dianguang Liu, Ke Zhao, Jinling Liu
Summary: This study systematically investigated the influence of an alternating current (AC) electric field on flash sintering and microstructural evolution of alumina-zirconia composite. The results showed that the AC electric field promoted densification and grain growth of the composite, and improved the uniformity of its microstructure. Dense composite ceramics with homogeneous microstructure were successfully fabricated via AC flash sintering at low furnace temperature.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Song Qi, Zeping Zhang, Fang Guan, Zhijia Lv, Dan Peng, Haitao Wang, Sen Tan, Wuping Liao
Summary: The Th1-xScxO2-x/2 ceramic system prepared via co-precipitation and sintering methods exhibited a single cubic fluorite structure. Doping with Sc contributed to decreased pores and more uniform grain distribution. Sc doping significantly enhanced the densification sintering and reduced the sintering temperature for ThO2-based ceramics.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Manufacturing
Min Ji, Jinyang Xu, Dedong Yu, Ming Chen, Mohamed El Mansori
Summary: This study investigates the densification mechanisms of 3Y-TZP through sintering experiments, focusing on the effects of sintering temperature on grain growth, phase composition, and mechanical properties. Results show that sintering temperature significantly impacts the cutting forces and temperatures of the zirconia, leading to changes in machinability. By conducting milling tests, the study also demonstrates the importance of precise control over machined surface quality through cutting within the ductile regime.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Review
Materials Science, Multidisciplinary
Balakrishna Palanki
Summary: The sintering of uranium dioxide, influenced by various factors, may lead to desintering and defects if not carefully controlled during manufacturing. The presence of agglomerates in the UO2 powder can be a source of defects, and these need to be managed to achieve high-density large grain sized and defect free sintered UO2 bodies. Researchers have proposed a unified explanation of the mechanisms involved in sintering, emphasizing the importance of controlling additives and atmosphere for successful sintering.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Shiro Ihara, Mizumo Yoshinaga, Hiroya Miyazaki, Kota Wada, Satoshi Hata, Hikaru Saito, Mitsuhiro Murayama
Summary: The in situ observation of thermally activated solid reactions in nanoparticles has been achieved using electron microscopy combined with electron tomography. The study revealed a negative correlation between neck growth and particle distance, and succeeded in reducing the electron dose and preventing interference from oxidation and other artifacts.
Article
Materials Science, Ceramics
Andreas Flaureau, Alicia Weibel, Geoffroy Chevallier, Claude Estournes
Summary: In this study, densification and grain growth mechanisms of Yttria-Stabilized Zirconia sintered by Spark Plasma Sintering were investigated. The mechanisms were determined based on sintering trajectories of different commercial submicronic powders with varying yttria amounts and particle sizes. Densification was found to occur through grain boundary sliding and other mechanisms, while grain growth followed a power law in fully densified ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Tristan Garnault, Didier Bouvard, Jean-Marc Chaix, Sylvain Marinel, Christelle Harnois
Summary: This paper presents a thorough analysis of direct microwave heating for sintering ceramic materials. Experimental and numerical studies showed that direct microwave heating is not suitable for reliable and homogeneous sintering of classical ceramics, which explains why susceptor-assisted heating is preferred in most cases.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Boren Ke, Wei Ji, Ji Zou, Jinyong Zhang, Weimin Wang, Zhengyi Fu
Summary: An ultra-high-pressure sintering strategy was developed to fully densify ZrC ceramic under 1.7 GPa at 1600 degrees Celsius, resulting in high density, fine grain size, excellent mechanical properties, and a large number of crystal defects. This unique microstructure led to an increased hardness of 2057.44 HV0.1.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Zhenfei Chai, Zhaohe Gao, Han Liu, Xun Zhang, Gyorgyi Glodan, Ping Xiao
Summary: The study found that sintering temperature and sintering additive content have significant effects on the microstructure and thermal conductivity of SiC ceramics. Increasing sintering temperature promotes grain growth, while higher sintering additive content results in smaller grain size and lower thermal conductivity.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Ying Wang, Jun Wang, Meng Ni, Peng Liu, Jian Zhang, Kuo Yang Lee, Hsing- Hsiang, Zhili Dong, Dingyuan Tang
Summary: The study showed that in the fabrication of Y2O3 transparent ceramics, a certain amount of nano-sized pores still existed after hot isostatic pressing (HIP), requiring air annealing for bleaching. Different annealing temperatures affected transparency, with high temperatures causing pore growth and loss of transparency, along with significant expansion in pore and sample dimensions.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Ke Zhao, Puzhen Feng, Jian Tan, Weimin Zhong, Jinling Liu, Dianguang Liu, Guozheng Kang, Linan An
Summary: In this paper, the synthesis of fully dense and ultrafine-grained binderless tungsten carbide (WC) by novel dynamic sinter forging is reported. A nearly fully dense sample was obtained at 1500 degrees C and 220 +/- 30 MPa@90 min. The enhanced densification and mechanical properties are attributed to the intragranular plastic deformation accommodated grain-boundary sliding induced by oscillatory pressure during dynamic sinter forging. The current results suggest a promising approach for the manufacturing of high-performance binderless WCs and may also be applicable to other material systems.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Le Fu, Jinghua Wu, Sharath Kumar Manjeshwar Sathyanath, Bohan Wang, Klaus Leifer, Hakan Engqvist, Salvatore Grasso, Wei Xia
Summary: Ultrafast high-temperature sintering (UHS) was used to prepare ZrO2-SiO2 nanocrystalline glass-ceramics (NCGCs) with a high relative density of approximately 95% achieved in about 50 seconds. The UHS technology hindered the formation of ZrSiO4 and cristobalite while enhancing the stabilization of t-ZrO2. The resulting NCGCs exhibited a microstructure of spherical monocrystalline ZrO2 nanocrystallites embedded in an amorphous SiO2 matrix.
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)