Article
Materials Science, Ceramics
Shenghao Li, Fang Ye, Laifei Cheng, Zhaochen Li, Junheng Wang, Jianyong Tu
Summary: In this study, porous silicon carbide ceramics with multilevel directional pores were prepared using chemical vapor infiltration (CVI) combined with sacrificial template method. A carbon fiber preform with a specific structure was used as a template, and silicon carbide was deposited through the CVI process. The carbon fiber template was then oxidized and removed, resulting in the porous silicon carbide ceramics. The influence of deposition time on pore structure, mechanical properties, and thermal properties was investigated. Compared to the traditional pore-making process, the sacrificial template method produces more regular pores, leading to excellent mechanical and thermal insulation properties. The sample deposited for 72 hours exhibited a porosity of 66.00%, a flexural strength of 67.52 MPa, and a thermal conductivity below 1 W/(m center dot K) from room temperature to 1200 degrees C.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Maria Carmen Vera, Julian Martinez-Fernandez, Mrityunjay Singh, Joaquin Ramirez-Rico
Summary: In this study, the high-temperature strength and thermal shock resistance of Si-Al-C-O and Si-Ti-C-O fiber-bonded SiC ceramics obtained from hot pressing of two types of ceramic fibers were investigated by mechanical testing. The bending strength of Si-Al-C-O-based fiber-bonded ceramics remains constant with temperature, while that of Si-Ti-C-O increases slightly at high temperature. Both materials show good thermal shock resistance with minimal reduction in elastic moduli after thermal shocks.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Yuhang Zhang, Xiong Liang, Yawei Li, Liping Pan, Qinghu Wang, Shaobai Sang
Summary: This work presents a simple approach to prepare SiC RPCs with 3D lattices structure by using the replica of printed resin, followed by pre-heating and vacuum infiltration. The addition of Si and flake graphite promotes the formation of SiC whiskers network structure, improving the thermal shock resistance and strength of SiC RPCs.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Chemistry, Physical
Xiaojia Su, Yiwang Bao, Detian Wan, Haibin Zhang, Ludi Xu, Salvatore Grasso, Chunfeng Hu
Summary: A rapid throughput thermal shock resistance evaluation method was developed and tested on Ti3SiC2 ceramic, revealing a significant decrease in strength during rapid heating and quenching processes. The main reasons for the degradation in residual strength include defects in the oxide layer on the sample surface, thermal tensile stresses, and weakening of grain boundaries due to water infiltration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
V. V. Kurbatkina, E. Patsera, P. A. Loginov, T. A. Sviridova, V. V. Klechkovskaya, E. A. Levashov
Summary: The study successfully synthesized homogeneous solid solution materials using self-propagating high-temperature synthesis and high-energy ball milling techniques. The resulting dense (Ta1-xZrx)C and (Ta1-xHfx)C solid solution samples, consolidated by hot pressing, showed significantly increased hardness and Young's modulus compared to TaC carbide. Through measurement of thermal properties and temperature dependence, it was found that Zr- and Hf-doped carbides exhibit high thermal stability.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Sawao Honda, Shinobu Hashimoto, Benoit Nait-Ali, David S. Smith, Yusuke Daiko, Yuji Iwamoto
Summary: Highly textured porous alumina was successfully fabricated using pulse electric current sintering (PECS) method, and its properties were measured in two directions. It was found that the porosity and thermal conductivity of the porous alumina varied along different directions, and the bending strength and thermal shock strength also showed significant differences in the two directions.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Sergey Shikunov, Alexei Kaledin, Irina Shikunova, Boris Straumal, Vladimir Kurlov
Summary: A new method for depositing gas-tight silicon carbide protective coatings with low gas permeability at high temperatures has been developed. The process involves the formation of free carbon atoms during the pyrolysis of hydrocarbon molecules, which then react with molten silicon or silicon vapor in the substrate layers. These coatings effectively protect various materials from oxidation and exhibit high thermal oxidation and thermal shock stability, as well as good adhesion to substrates.
Article
Materials Science, Ceramics
Shynar Kultayeva, Young-Wook Kim, In-Hyuck Song
Summary: The study found that doping significantly affects the properties of porous SiC ceramics, with electrical resistivity strongly influenced by doping while thermal and mechanical properties primarily dependent on the necking area between grains. Results show that the electrical conductivity of porous SiC ceramics can be successfully tuned independently of the thermal conductivity through suitable doping.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Maria Dolores Sosa Lucio, Shynar Kultayeva, Young-Wook Kim
Summary: In this study, a new strategy of applying a double-layer coating was established to improve both the mechanical strengths and thermal resistances of porous SiC ceramics. The double-layer coating led to a unique gradient pore structure, resulting in increased flexural strengths and decreased thermal conductivities of the ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
O. Popov, T. Avramenko, V. Vishnyakov
Summary: TiB2-SiC-C and TiB2-TiC-C heteromodulus ceramics were sintered by reactive hot pressing, resulting in materials with improved fracture toughness and thermal conductivity, as well as high thermal shock resistance. The thermal shock crack growth is arrested by low hardness graphite platelets formed within the hard matrix during the in-situ exothermic reaction.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Ceramics
Kenneth Kane, Eugenio Garcia, Michael Lance, Cory Parker, Sanjay Sampath, Bruce Pint
Summary: Environmental barrier coatings (EBCs) are crucial for protecting SiC-based ceramic matrix composite components in next-generation high-efficiency industrial gas turbines (IGTs). However, limited data on EBC failure mechanisms exist, particularly at high temperatures. Experimental results showed that at elevated temperatures, EBCs formed thick, highly cracked, and fully crystalline cristobalite scales.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Xiaoqian Liu, Yang Zhou, Xufeng Liu, Runfeng Li, Shibo Li, Cuiwei Li
Summary: This study prepared porous ceramics with high silicon carbide content using iron tailings through carbothermal reduction sintering process and improved the thermal conductivity. The carbothermal reduction of SiO(2) occurs above 1300 degrees C, generating liquid phase to enhance porosity.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Kyung-Jin Lee, Eun-Jeong Yi, Yanggu Kang, Haejin Hwang
Summary: The study focused on coating silicon carbide (SiC) on porous carbon through impregnation to enhance its chemical stability and oxidation resistance. The SiC coating effectively slowed down the oxidation of porous carbon. The compressive strength of SiC-coated porous carbon was nearly double that of pristine porous carbon.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Ceramics
Shynar Kultayeva, Young-Wook Kim
Summary: This study investigated the effects of boron carbide (B4C) content and sintering atmosphere on the properties of porous silicon carbide (SiC) ceramics. It was found that the electrical resistivity was lower in the nitrogen-sintered samples, while the thermal conductivity and flexural strength were higher in the argon-sintered samples. The properties were also influenced by the B4C content.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Wei Chen, Jing Jiang, Abdulmelik H. Meda, Mesfin S. Ibrahim, Guoqi Zhang, Jiajie Fan
Summary: SiC MOSFET is a power device with high breakdown voltage, high-temperature operation, and high switching frequency. However, existing packaging methods limit its performance due to high parasitic inductance and poor heat dissipation. This study proposes a fan-out panel-level packaging (FOPLP) SiC MOSFET, which shows improved performance in terms of reduced parasitic inductance, low thermal resistance, and increased reliability under thermal cycling.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Chemistry, Physical
T. Remyamol, Honey John, Pramod Gopinath
Article
Polymer Science
Sajith Menon, Remyamol Thekkayil, Shinto Varghese, Suresh Das
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
(2011)
Article
Materials Science, Multidisciplinary
Remyamol Thekkayil, Reji Philip, Pramod Gopinath, Honey John
MATERIALS CHEMISTRY AND PHYSICS
(2014)
Article
Optics
T. Remyamol, Pramod Gopinath, Honey John
Article
Materials Science, Multidisciplinary
Remyamol Thekkayil, Honey John, Pramod Gopinath
Article
Chemistry, Multidisciplinary
T. Remyamol, Pramod Gopinath, Honey John
Article
Materials Science, Multidisciplinary
T. Remyamol, Pramod Gopinath, Honey John
MATERIALS RESEARCH EXPRESS
(2014)
Article
Materials Science, Multidisciplinary
Remyamol Thekkayil, Pramod Gopinath, Honey John
MATERIALS RESEARCH EXPRESS
(2014)
Article
Materials Science, Multidisciplinary
Prakash C. Mahakul, P. Gayathri, T. Remyamol, H. Sreemoolanadhan, M. R. Ajith, Manu Jaiswal
MATERIALS RESEARCH EXPRESS
(2020)
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)