Article
Materials Science, Ceramics
Huiwen Xiong, Lianzhong Zhao, Hehao Chen, Hang Luo, Xi Yuan, Kechao Zhou, Dou Zhang
Summary: This study utilized direct ink writing combined with polymer impregnation and pyrolysis (PIP) to prepare 3D SiC-based composites, aiming to enhance the strength of the composites by introducing interconnected pores or coated SiC within 3D scaffolds. The results demonstrate that dense 3D polymer-derived ceramics (PDCs) with adjustable structures and compositions can be achieved through direct ink writing and subsequent PIP process.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
D. Vedel, A. Osipov, L. Melakh, M. Brodnikovskyi, O. Grigoriev
Summary: ZrB2-15 vol% MoSi2 ceramics were hot pressed in CO/CO2 atmosphere in the 1700-1900oC temperature range. During hot pressing, MoSi2 decomposes into Mo and Si, resulting in the phase composition of ZrB2, (Zr, Mo)B2, SiC, SiO2, and MoB in the as-sintered ceramic. Contact melting between ZrB2 and MoSi2 occurs at 1800oC, forming (Zr, Mo)B2. The ceramics sintered at 1800-1850oC exhibited - 500 \MPa and 200 MPa strength at room temperature and in vacuum at 1800oC, respectively. The thickness of the oxidized scales after exposure at 1600 oC for 120 min ranged from 30-80 μm and depended on the amount of residual MoSi2 and (Zr, Mo) B2. The ceramic sintered at 1850 degrees C displayed the highest oxidation resistance.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Masoumeh Dehghanzadeh Alvari, Mahdi Ghassemi Kakroudi, Behnam Salahimehr, Reza Alaghmandfard, Mehdi Shahedi Asl, Mohsen Mohammadi
Summary: The ZrB2-20 vol% SiC-5 vol% B4C composite prepared by hot pressing at 1850 degrees C showed high density, good mechanical properties, and distinct oxidation behavior with different layers formed during the oxidation process.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
D. Vedel, O. Grigoriev, P. Mazur, A. Osipov, M. Brodnikovskyi, L. Silvestroni
Summary: Simple hot pressing and vacuum pre-treatment at 1600 degrees C followed by hot pressing were used for obtaining dense composites of ZrB2-15 vol% SiC-5 vol% Mo2C. The room temperature strength was around 820 MPa for the hot-pressed material and 650 MPa for the material obtained by use of thermally treated powders. The two-step processing route resulted in a material with higher oxidation resistance, due to coarser grain size and higher amount of (Mo,Zr)B phase, which remained stable as solid compound in the sub-scales.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Jia Cai, Fangxia Zhao, Zhenzhong Zhang, Yaran Niu, Tu Xu, Zhonghua Shen, Xuebin Zheng
Summary: This paper proposes the idea of recombining PCS reflective/ablative coating on the surface of traditional YSZ thermal insulation coating for kilowatt-level lasers. YPY coating showed better laser protection effect than YSZ coating, due to its high reflectivity and the laser energy consumed by PCS pyrolysis. The study also found that SiO2, SiC, and Y2SiO5 phases generated during laser ablation provided further protection. This work is expected to provide references for the design of new laser-resistant composite coatings.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Mingwei Chen, Haipeng Qiu, Bingyu Zhang, Xin Ma, Wendong Luo, Shanhua Liu, Shijian Liu
Summary: SiC/SiBCZr composites were prepared utilizing polymer impregnation and pyrolysis process, leading to reduced porosity, sealing effect, and excellent high temperature structural stability through optimized treatments. The formation of borosilicate oxidation products during oxidation reaction effectively inhibits oxidation and enhances the high temperature stability of the composites.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Yaxiong Liu, Yehong Cheng, Denghao Ma, Ning Hu, Wenbo Han, Dazhao Liu, Shuai Wu, Yumin An, Anzhe Wang
Summary: By using ultrasound-assisted fiber separation technique and low temperature hot-pressing, ceramic slurry can be impregnated into continuous carbon fiber bundles during direct ink writing, leading to the fabrication of high-performance ceramic matrix composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Polymer Science
Ameya Krishna, Joshua D. Willott, Saskia Lindhoud, Wiebe M. de Vos
Summary: Salt-plasticized polyelectrolyte complexes of sodium polystrenesulfonate and polydiallyldimethylammonium chloride were hot-pressed to create fully dense materials. The quality of the materials depends on the molecular weights of the polyelectrolytes, the type and concentration of salt, and the processing conditions. These dense materials can be easily fabricated into free-standing films with uniform mechanical properties. Thin fibers can also be added to enhance tensile strength.
Article
Materials Science, Ceramics
Yanyan Qin, Dewei Ni, Bowen Chen, Jun Lu, Feiyan Cai, Xuegang Zou, Le Gao, Xiangyu Zhang, Yusheng Ding, Shaoming Dong
Summary: This study proposes a novel method to fabricate dense Ta0.2Hf0.8C ceramics at low temperature using Si as a sintering aid. Reactive hot-pressing was used to densify Ta0.2Hf0.8C at 1700 degrees C, resulting in the formation of SiC. The microstructure evolution mechanisms and the effect of silicon content on the densification and mechanical properties of the ceramics were investigated. The results show that the Ta0.2Hf0.8C-SiC ceramics have a low apparent porosity of 0.5% and high bending strength and fracture toughness of 637 MPa and 6.7 MPa m(1/2), respectively, when the silicon content is 8 wt.%. This work provides new insights for the low-temperature densification of TaxHf1-xC and other high-performance ultrahigh temperature ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Bo-Wen Chen, De-Wei Ni, Jun Lu, Fei-Yan Cai, Xue-Gang Zou, Hai-Jun Zhou, Shao-Ming Dong
Summary: Research showed that Cf/ZrB2-SiC composite can form a protective oxide layer under high-temperature ablation conditions, but the structural stability of the oxide layer needs optimization to retard the aggregation, growth, and phase transition of ZrO2.
Article
Polymer Science
Zhe Pan, Minmin Mao, Bin Zhang, Zhongyu Li, Kaixin Song, Hai-Feng Li, Zhu Mao, Dawei Wang
Summary: In this manuscript, bisphenol F epoxy resin (EPF) was fabricated into polymer films using a hot-pressing method. The curing degree of EPF was found to be significantly affected by the ratio of EP monomer/curing agent, resulting in improved breakdown strength and energy storage performance. Specifically, an EPF film with an EP monomer/curing agent ratio of 1:1.5 achieved a high discharged energy density (U-d) of 6.5 J.cm(-3) and efficiency (eta) of 86% under an electric field of 600 MV.m(-1), demonstrating the facile production of high-quality EP films with excellent energy storage performance for pulse power capacitors.
Article
Materials Science, Ceramics
Zhen-Quan Liang, Xian-Ming Zeng, Kun-Heng Huang, Jun-Jie Yu, Rui-Lin Lin, Shi-Kuan Sun, Wei-Ming Guo, Hua-Tay Lin
Summary: The addition of ZrB2 in Si3N4 ceramics enhanced the transformation of alpha-Si3N4 into beta-Si3N4 phase and increased fracture toughness but decreased Vickers hardness. However, excessive ZrB2 content resulted in the formation of equiaxed coarse beta-Si3N4 grains and a significant decrease in Vickers hardness and fracture toughness.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Lingappa Rangaraj
Summary: Ti3AlC2 ceramic was prepared by reactive hot pressing, exhibiting high relative density and mechanical properties. Pressure and time had a certain influence on the phase volume and density of the material at 1300 degrees C.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Zhuolin Li, Yun Wu, Lijuan Zhang, Chuncheng Wei, Hao Sui, Zhiyuan Sun, Daoqian Li, Guangwu Wen, Jianqi Wang
Summary: The Cf/SiBCN-ZrB2 composites were prepared by dipping and winding combined with reactive hot pressing. The flexural strength and fracture toughness reached 261 MPa and 11.96 MPa center dot m1/2, respectively, through continuous carbon fibers debonding, pulling and bridging mechanisms. Excellent mechanical properties ensured that the Cf/SiBCN-ZrB2 composites remained intact after exposure to a plasma flame with a heat flux of 9.37 MW/m2 for 300 s, with the mass and linear ablation rates of 1.78 mg/s, 1.01 mu m/s, respectively. The excellent ablation resistance was due to the formation of dense oxide layers separating the matrix from the plasma flame. The SiO2 formed in the low-temperature areas away from the center was the main ablation-resistant barrier, while the ZrO2/SiO2 double oxide layer formed in the high-temperature region at the center was the major ablation-resistant barrier.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
A. N. Astapov, B. E. Zhestkov, Yu S. Pogozhev, M. Zinovyeva, A. Yu Potanin, E. A. Levashov
Summary: This study investigates the oxidation resistance of coatings manufactured using reactive impregnation, finding that they can effectively inhibit oxygen ingress and further oxidation of the substrate. However, high temperatures may result in evaporation of the glass phase. The temperature gradient across the coatings' thickness helps retain some glassy phase, enhancing protection against oxygen diffusion.
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)