Article
Materials Science, Ceramics
Nikhil Bhootpur, Hans Brouwer, Yinglu Tang
Summary: In this study, a single-step sintering process was developed to prepare zirconia material with high relative density and low sintering temperature by combining water vapor and Bi2O3 sintering aid. The influence of sintering pressure and temperature on sample porosity was investigated, and a linear relationship between hardness and relative density was found.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Juan Wang, Xiaoyu Wang, Qianlong Fu, Jinxiu Fu, Fengrui Zhai, Shuang Li
Summary: Silicon carbide ceramic membranes have been widely used in the treatment of corrosive and high temperature wastewaters. However, the high sintering temperature and energy consumption hinder the large-scale manufacturing of SiC ceramic membranes. In this study, a low melting-point glaze was used as a sintering aid to prepare a silicon carbide ceramic membrane support, which improved the fracture strength of the porous ceramics. The permeance and selectivity of the support were investigated, showing increased pure-water flux and decreased oil rejection with increasing trans-membrane pressure. This work provides a feasible route for low-energy consumption preparation of SiC porous ceramics.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Applied
Kei-Ichiro Murai, Norimasa Inoue, Tomoki Sawada, Yasushi Fujiwara, Toshihiro Moriga
Summary: In this study, Zr2-xTixWP2O12 (x = 0.05, 0.10, 0.15, 0.20) ceramics with high relative density were successfully obtained by adding 0-0.9 wt% MgO as a sintering aid. The influence of MgO amount and relative density on the coefficient of thermal expansion for Zr2-xTixWP2O12 was investigated. The results showed that doping of MgO does not affect the coefficient of thermal expansion, but it improves the sintering properties.
MODERN PHYSICS LETTERS B
(2023)
Article
Materials Science, Ceramics
Steven M. Smith, Lun Feng, William G. Fahrenholtz, Gregory E. Hilmas, Laura Silvestroni
Summary: The thermal and electrical properties of TiB2 ceramics were significantly affected by the addition of varying amounts of CrB2, showing a decrease in thermal diffusivity, an increase in anisotropy in thermal expansion coefficients, and a decrease in electrical conductivity with increasing Cr content.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
F. Giovannelli, E. Sabarthes, F. Delorme
Summary: In this study, spark plasma sintering was used to prepare dense ceramics of La7Mo7O30 from La2Mo2O9 powder and investigate their thermoelectric properties. The experimental results show that La2Mo2O9 was reduced to La7Mo7O30 during the SPS process. The obtained La7Mo7O30 ceramic exhibits semiconducting behavior with a high electrical conductivity at 1000 K and a very low thermal conductivity throughout the temperature range from room temperature to 1000 K. The figure of merit reached 0.04 at 1000 K.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Niu Zhang, Jinghua Li, Xiaoshuai Kong, Mengting She, Peng Guo, Jingjing Sun, Peiling Yuan, Shuaipu Zang, Mingju Chao, Erjun Liang
Summary: Nb14W3O44, prepared using a solid-state method, exhibits a tetragonal structure and intriguing linear negative thermal expansion (NTE) properties. The NTE phenomenon is attributed to the vibrations of the bridge-site atoms, while lattice distortion and pores could also affect the thermal expansion performance in the bulk materials.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
B. K. Afornu, A. M. Lider, E. B. Agyekum, P. A. Amoah, M. N. Ansah
Summary: Micro-indentation tests were conducted on sintered Silicon Carbide (SiC) deposited on Zr-1Nb (E110) substrates fabricated in air and Ar atmosphere. The results showed that SiC sintered on Zr-1Nb in air and Ar exhibited significantly higher hardness and resistance to depth penetration by the indenter compared to uncoated Zr-1Nb. XRD phase quantitative analysis indicated the formation of approximately 15% more protective oxides, mainly SiO2, on samples sintered in air, contributing to increased resistance to mechanical deformation.
Article
Materials Science, Ceramics
Yumi Fukuda, Koichi Harada, Maki Yonetsu, Ariane K. Albessard, Yasushi Hattori, Kenji Essaki, Yasuhiro Goto, Tomohiro Suetsuna
Summary: In this study, the thermal conductivity of sintered reaction-bonded silicon nitride (SRBSN) was found to increase with sintering temperature, while the lattice oxygen content decreased with increasing temperature. The analysis also revealed that the lattice oxygen substitution in beta-Si3N4 crystals could affect thermal conductivity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Nikolaos P. Karagiannakis, Eugene D. Skouras, Vasilis N. Burganos
Summary: Nanoparticle aggregation plays a crucial role in the thermal properties of nanofluids. This study focuses on the effects of particle size non-uniformity and sintering on the effective thermal conductivity of particle aggregates. The results show that both non-uniformity and sintering lead to a decrease in thermal conductivity.
Article
Engineering, Multidisciplinary
Mohammad S. Islam, Wenkai Chang, Zhao Sha, Jiawei Wang, Shuying Wu, L. R. Francis Rose, Anthony J. Kinloch, Chun H. Wang
Summary: In this study, a new method of mitigating cryogenic microcracking in CFRPs is reported using ZrW2O8 nanoparticles, which have a negative thermal expansion, to reduce thermal residual stresses and enhance the fracture energy of the epoxy matrix. The addition of 1 wt% polydopamine-functionalized ZrW2O8 nanoparticles increases the fracture energy of the matrix material by 140%, reduces the coefficient of thermal expansion by 20%, and enhances the interlaminar fracture energy of the resulting CFRP by about 100% at -196°C. The modified matrix successfully prevents microcracking at -196°C in a blocked cross-ply CFRP laminate with a [04/908/04] fibre architecture.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Ceramics
Somnath Mandal, James G. Hemrick, Manoj K. Mahapatra
Summary: Considering the toxicity of Cr6+ in chrome-based refractories, the development of chrome-free Mg2TiO4 phase is being explored for its improved hot strength and resistance to thermal shock and slag corrosion. The use of industrial anatase instead of rutile as a precursor resulted in lower expansion and earlier reaction. Sintering at 1,600 degrees C produced an aggregate with 0% porosity and higher bulk density when anatase was used. The replacement of rutile by anatase also eliminated the undesirable MgTiO3 phase.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Kundan Kumar, Young -Jo Park, Mi-Ju Kim, Ha-Neul Kim, Ho Jin Ma, Jae-Wook Lee, Jae-Woong Ko
Summary: Dense Si3N4 ceramic was fabricated by pressureless sintering, and the addition of ternary oxide additives was found to significantly affect the phase, microstructure, and thermal conductivity of the material.
Article
Thermodynamics
Yuankun Zhang, Zhuosheng Han, Zihang Zhu, Yongsheng Yu, Yiming Gao, Chunsheng Guo
Summary: Loop heat pipes (LHPs) play an important role in managing thermal conditions in critical electronic components of spacecraft and satellites. This study establishes an efficient procedure for predicting the effective thermal conductivity (ETC) in bi-porous wicks and highlights the valuable contributions of both analytical and numerical methods in evaluating ETC of sintered bi-porous structures.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Jianhao Wang, Shogo Yodo, Hiroaki Tatsumi, Hiroshi Nishikawa
Summary: In order to meet the requirements for high-temperature die attach in terms of thermal conductivity and reliability, a novel Ag paste modified with AlN nanoparticles was developed. The thermal conductivity of the joint sintered by this modified Ag paste was tested after long-term thermal aging. It was found that the addition of 1 wt% AlN nanoparticles significantly reduced the porosity of the joint, resulting in an increase in thermal conductivity from 164.3 to 273.0 W/(K center dot m). However, excessive addition of AlN nanoparticles slightly decreased the thermal conductivity of the sintered joints. Furthermore, all joints experienced an increase in porosity and pore size during thermal aging, leading to a decrease in thermal conductivity. Nevertheless, the joint sintered with 1.0 wt% AlN nanoparticles still exhibited a high thermal conductivity of 249.4 W/(K center dot m) after 1008 hours of thermal aging, demonstrating excellent thermal conductivity and reliability.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Ceramics
Kimihiro Taguchi, Yuki Ishino, Tomoharu Tokunaga, Takahisa Yamamoto
Summary: The study employed rate-controlled sintering method for 8YSZ polycrystals, achieving constant linear shrinkage of green compacts through rating the current limit of AC electric field. A near-theoretical density 8YSZ polycrystal was successfully produced with a grain size of approximately 3.4 μm by setting the maximum current limit at 1150 mA in an AC electric field.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(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)