Article
Materials Science, Multidisciplinary
Lili Tian, Yinli Peng, Xing He, Yang Bai, Xiaowei Lei, Nan Wang
Summary: This study unraveled the onset mechanism of irregular eutectic growth by studying the morphology transitions in a transparent eutectic system. The results showed that a decoupled interface gradually appeared from an original coupled interface after the specimen was exposed in a thermal gradient, leading to the growth of two types of seeds under an exerted pulling rate. The findings provide new insights into the solidification dynamics of irregular eutectic systems.
Article
Materials Science, Multidisciplinary
Liang Qiao, Shuangming Li, Xin Cao, Hong Zhong, Yumin Wang
Summary: The anisotropy of solid-liquid interface energy plays a fundamental role in dendritic morphology and pattern selection during solidification. Different dendritic morphologies are observed in Al-3 wt% Mg single crystals along different crystal orientations. A non-regular dendritic pattern selection map is constructed to explain the occurrence of different dendrites during alloy solidification.
Article
Materials Science, Multidisciplinary
Jilong Kang, Min Zhao
Summary: The directional solidification process of Co-Sn alloys was studied, with a specific focus on the unique 'seaweed' morphology observed in this system. It was found that the withdrawal velocity had a significant effect on the solid/liquid interface morphology as well as the growth location of the primary phases.
MATERIALS SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Qian Zhou, Bei Xue, Shengyue Gu, Zhaoning Yang
Summary: This study investigates the competitive grain growth behavior in laminated ceramic composites through phase-field simulation, revealing the impact of anisotropy in grain boundary energy on grain coarsening and deformation near interfaces. The simulation results show that grain growth kinetics significantly influence the polycrystalline microstructure, leading to the formation of an oriented columnar grain layer near the interface.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Haiwei Wang, Xiaoli Zhang, Jie Meng, Jinxia Yang, Yanhong Yang, Yizhou Zhou, Xiaofeng Sun
Summary: The research found that the grain overgrowth rate was weakly dependent on the temperature gradient, but sensitive to the solute field around the dendrite tips. Moreover, with increasing natural convection, the grain overgrowth rate tended to be promoted. The solute field was identified as the dominant factor governing the overgrowth behavior of competing grains.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Multidisciplinary
Chang-Sheng Zhu, Zi-Hao Gao, Peng Lei, Li Feng, Bo-Rui Zhao
Summary: The multi-phase field model of grain competitive growth during directional solidification of alloy is established in this study. The grain boundary evolution and grain elimination during the competitive growth of SCN-0.24-wt% camphor model alloy bi-crystals are investigated, and the effects of different crystal orientations and pulling velocities on grain boundary microstructure evolution are quantitatively analyzed. Several important findings are obtained.
Article
Chemistry, Multidisciplinary
Di Zhao, Haijun Su, Yuan Liu, Zhonglin Shen, Haifang Liu, Yinuo Guo, Xiang Li, Dong Dong, Hao Jiang, Congcong Liu, Peixin Yang, Jun Zhang, Lin Liu, Chengyu Zhang, Hengzhi Fu
Summary: In this study, a highly porous ceramic composite with a dense and nanostructured skeleton matrix and a lotus-type porous structure was successfully fabricated using a directional solidification process. This composite exhibited a record-breaking strength among current porous ceramics, remaining strong even at high temperatures due to its refined lamellar structure and strong bonding interface. The findings demonstrate an efficient method for preparing ultrahigh-strength porous ceramics with high purity.
Article
Materials Science, Multidisciplinary
Mang Xu, Xiang-long Zhang, Xiao-qi Geng, Guo-huai Liu, Ye Wang, Zhao-dong Wang, Jing-jie Guo, Guo-dong Wang
Summary: The study investigated microstructure evolution and competitive grain growth in the spiral part of a single crystal sample with a crystal orientation deviating from the axial direction. It was found that stray grains in the spiral part compete with originally preferred orientation grains, leading to single-crystal orientation deviation defect. Stray grains tend to nucleate at the initial stage in the spiral part, and the inclined temperature gradient promotes their development.
Article
Materials Science, Multidisciplinary
Chunwen Guo, Kangrong Weng, Jincheng Wang, Hongliang Zhao, Xianglei Dong, Yuheng Fan, Junjie Li
Summary: The competitive growth of two diverging grains was investigated through 3D phase-field simulations. The study found that the grain elimination behavior differs between 2D and 3D cases due to the different spatial arrangement. The elimination rate of grains is faster in 3D competitive growth.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Crystallography
T. Hughes, A. J. Robinson, S. McFadden
Summary: Competitive growth between neighbouring (111) dendrites was investigated in directional solidification experiments using a transparent model alloy. The results showed that the secondary arms of (111) dendrites grew with more favourable orientation than those of (100) dendrites, allowing them to outgrow and stabilize along the growth direction. The deviation from the Walton-Chalmers rule of competitive growth was found to be probabilistic and dependent on the initial seeding and 3D nature of the experiments.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Materials Science, Multidisciplinary
T. Hughes, A. J. Robinson, S. McFadden
Summary: Directional solidification experiments with transparent alloy systems often show multiple dendrites growing with preferential alignment. An experimental apparatus with a novel computer vision algorithm was used to automatically detect and track multiple columnar dendrite tips, providing statistical and qualitative insights.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Haitao Huang, Hongsheng Ding, Xuesong Xu, Ruirun Chen, Jingjie Guo, Hengzhi Fu
Summary: Directional solidification of g-TiAl alloys with abruptly varying cross-sections was conducted in yttria molds using an electromagnetic cold crucible. The process of grain growth and the columnar-equiaxed transition during directional solidification were summarized based on experimental results and finite element simulation. It was found that increasing the withdrawing rate or decreasing the nucleation rate can promote continuous growth, and the degree of directionality of microstructures at elevated temperatures increases with increasing withdrawing rate and nucleation rate.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Xuefeng Zhu, Zhu Xiao, Junhong An, Hongyun Jiang, Yanbin Jiang, Zhou Li
Summary: A Phi 40 mu m Cu-4 wt%Ag alloy wire with high strength and high electrical conductivity was prepared by continuously directional solidification and cold drawing. The study investigated the evolution of microstructure and properties, revealing the main deformation mechanisms and strengthening mechanism of the alloy during different stages of the drawing process.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Yuan Liu, Haijun Su, Zhonglin Shen, Di Zhao, Yinuo Guo, Shanding Li, Min Guo, Lin Liu, Hengzhi Fu
Summary: In this study, the Czochralski technique is used to prepare large-sized eutectic single crystal ceramic with a highly oriented and unique texture. The crystallographic orientation control is achieved by induction of a single crystal seed, resulting in a defined single orientation relationship along the solidification direction. This successful texture control provides a promising orientation design pathway for eutectic solidification.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Shaodong Hu, Long Hou, Kang Wang, Zhongmiao Liao, Wen Zhu, Aihua Yi, Wenfang Li, Yves Fautrelle, Xi Li
Summary: Research indicates that thermoelectric magnetic convection (TEMC) under transverse static magnetic field leads to solute enrichment on one side of the sample, affecting primary dendrite arm spacing and freckle formation. The impact intensifies with an increase in magnetic field strength.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Wenchao Yang, Pengfei Qu, Ruirong Zhang, Jiarun Qin, Chen Liu, Jun Zhang, Lin Liu
Summary: The three-dimensional atom-probe tomography was used to characterize the interface structure of the gamma/gamma' in a third-generation Ni-based single crystal superalloy with Re addition, revealing an element-segregation layer with Re, Co, and Cr in the gamma phase close to the interface which resulted in a more negative local interface misfit. Additionally, it was deduced that the presence of harmful topologically close-packed phases might be facilitated by the co-segregation of Re, Co, and Cr, and the depletion of Ni near the interface.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Haijun Su, Zhonglin Shen, Qun Ren, Yuan Liu, Di Zhao, Haifang Liu, Guangrao Fan, Min Guo, Jun Zhang, Lin Liu, Hengzhi Fu
CERAMICS INTERNATIONAL
(2020)
Article
Materials Science, Multidisciplinary
Haijun Su, Yuan Liu, Qun Ren, Zhonglin Shen, Haifang Liu, Di Zhao, Guangrao Fan, Min Guo, Jun Zhang, Lin Liu, Hengzhi Fu
Summary: The distribution control and formation mechanism of gas inclusions in directionally solidified Al2O3-Er3Al5O12-ZrO2 eutectic ceramic rods during laser floating zone melting were explored. The presence of gas inclusions was found to be strongly influenced by the solidification rate, with intermittent formation at moderate rates and continuous formation at higher rates. Gas inclusions exhibited an elongated finger-like pattern and their volume fraction gradually increased with the solidification rate. The primary formation mechanism of gas inclusions was evaluated to be heterogeneous nucleation of gas bubbles.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Haifang Liu, Haijun Su, Zhonglin Shen, Di Zhao, Yuan Liu, Yinuo Guo, Min Guo, Jun Zhang, Lin Liu, Hengzhi Fu
Summary: This study successfully fabricated large-scale Al2O3/GdAlO3/ZrO2 ternary eutectic ceramic materials using laser 3D printing technology, with heat treatment applied to eliminate microstructure heterogeneity and reveal the microstructure homogenization mechanism. The results showed that the eutectic spacing linearly increased with heat treatment time, following the Graham-Kraft model.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Haifang Liu, Haijun Su, Zhonglin Shen, Di Zhao, Yuan Liu, Yinuo Guo, Huitian Guo, Min Guo, Keyu Xie, Jun Zhang, Lin Liu, Hengzhi Fu
Summary: This study successfully fabricated near-full-density Al2O3/GdAlO3/ZrO2 ternary eutectic ceramics with different shapes and smooth surfaces using a synchronized-powder-feeding-based laser directed energy deposition (LDED) technique. The microstructure characteristics and formation mechanism of the observed periodic banded structures were systematically studied, revealing the drastic abnormal coarsening of nanoscale microstructures as the cause. Additionally, a physical model was proposed to illustrate the microstructure evolution of the 3D-printed eutectic ceramic.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Yuan Liu, Haijun Su, Ze Lu, Zhonglin Shen, Yinuo Guo, Di Zhao, Haifang Liu, Keyu Xie, Taiwen Huang, Wenchao Yang, Min Yang, Jun Zhang, Lin Liu, Hengzhi Fu
Summary: A directionally solidified Al2O3/Y3Al5O12:Ce3+ eutectic phosphor ceramic with superior luminous efficacy and high fracture toughness was fabricated using laser floating zone melting. The doping of Ce element and the diffusion coefficient played important roles in the formation of cellular structure and enlargement of the eutectic lamella spacing. The optimal phase interface design improved light conversion efficiency. This eutectic ceramic has great potential in high-brightness applications of WLEDs.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Manufacturing
Haifang Liu, Haijun Su, Zhonglin Shen, Di Zhao, Yuan Liu, Yinuo Guo, Jun Zhang, Lin Liu, Hengzhi Fu
Summary: The research shows that the additively manufactured Al2O3-based eutectic ceramics exhibit excellent thermal stability and can maintain their properties at high temperatures, making them potential materials for long-term structural applications in elevated temperature environments.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Xiang Li, Haijun Su, Dong Dong, Di Zhao, Yuan Liu, Zhonglin Shen, Hao Jiang, Yinuo Guo, Haifang Liu, Guangrao Fan, Wenchao Yang, Taiwen Huang, Jun Zhang, Lin Liu, Hengzhi Fu
Summary: This study demonstrates the preparation of alumina ceramic cores with high porosity, moderate strength, and low high-temperature deflection using stereolithography (SLA) 3D printing and a novel powder gradation design strategy. By optimizing particle size gradation and sintering process, the comprehensive properties of the ceramic cores are significantly enhanced.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Zhonglin Shen, Haijun Su, Haifang Liu, Di Zhao, Yuan Liu, Yinuo Guo, Guangrao Fan, Minghui Yu, Jun Chen, Min Guo, Jun Zhang, Lin Liu, Hengzhi Fu
Summary: Selective laser melting (SLM) is a novel approach for directly preparing highly dense eutectic composite ceramics, achieving net-shaped plates with increased quality using different strategies, and transforming microstructure from ultra-fine irregular eutectic to complex regular eutectic with scanning rate increase. The method effectively fabricates high-performance net-shaped structural composite ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Di Zhao, Haijun Su, Yuan Liu, Zhonglin Shen, Haifang Liu, Yinuo Guo, Xiang Li, Dong Dong, Hao Jiang, Congcong Liu, Peixin Yang, Jun Zhang, Lin Liu, Chengyu Zhang, Hengzhi Fu
Summary: In this study, a highly porous ceramic composite with a dense and nanostructured skeleton matrix and a lotus-type porous structure was successfully fabricated using a directional solidification process. This composite exhibited a record-breaking strength among current porous ceramics, remaining strong even at high temperatures due to its refined lamellar structure and strong bonding interface. The findings demonstrate an efficient method for preparing ultrahigh-strength porous ceramics with high purity.
Article
Engineering, Manufacturing
Di Zhao, Haijun Su, Kehui Hu, Zhigang Lu, Xiang Li, Dong Dong, Yuan Liu, Zhonglin Shen, Yinuo Guo, Haifang Liu, Guangrao Fan, Jun Zhang, Lin Liu, Hengzhi Fu
Summary: Digital light processing has improved ceramic material shaping, but also brought new challenges. This study reveals the spatial distribution of ceramic powders and resin in a printed precursor, studies the formation mechanism of the lamellar structure, and investigates its effects on sintering and strength.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Haotian Zhou, Haijun Su, Yinuo Guo, Peixin Yang, Yuan Liu, Zhonglin Shen, Di Zhao, Haifang Liu, Taiwen Huang, Min Guo, Jun Zhang, Lin Liu, Hengzhi Fu
Summary: A numerical model based on DEM and CFD has been proposed to simulate the physical phenomena during SLM-fabricated superalloy. The model can predict the temperature field, molten pool flow behavior, and pore evolution. The results are validated by experiments and provide insights into the formation and evolution of lack of fusion and keyhole-induced pores.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Materials Science, Ceramics
Haifang Liu, Haijun Su, Zhonglin Shen, Hao Jiang, Di Zhao, Yuan Liu, Yinuo Guo, Xiang Li, Min Guo, Jun Zhang, Lin Liu, Hengzhi Fu
Summary: Oxygen vacancies are crystal defects in eutectic ceramics fabricated by laser 3D printing. They are formed through vacancy migration mechanism and do not significantly affect the crystalline structure and microstructure of the ceramics. However, they do affect the chemical bond property and mechanical property of the as-deposited ceramics.
JOURNAL OF ADVANCED CERAMICS
(2022)
Article
Engineering, Manufacturing
Haijun Su, Haifang Liu, Hao Jiang, Zhonglin Shen, Qian Chen, Minghui Yu, Di Zhao, Xiang Li, Dong Dong, Zhuo Zhang
Summary: Directed energy deposition (DED) is a promising technique for preparing high-performance Al2O3-based eutectic ceramics without sintering. However, the study on DED preparation of ceramic material is still in its infancy, and the control of defects and optimization of growth process are still the focuses of research in this field.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Ceramics
Liu Haifang, Su Haijun, Shen Zhonglin, Jiang Hao, Zhao Di, Liu Yuan, Zhang Jun, Liu Lin, Fu Hengzhi
Summary: Melt-grown oxide eutectic ceramics exhibit excellent high-temperature properties due to liquid-solid phase transformation. Laser additive manufacturing has become the most promising technique for fabricating these ceramics. Research progress in laser additive manufacturing oxide eutectic ceramics includes forming process, solidification defect control, microstructure evolution, and mechanical properties. Future work should focus on developing high-quality eutectic ceramic powders, preparing large-scale parts with complex shapes, controlling solidification defects, and strengthening eutectic composites.
JOURNAL OF INORGANIC MATERIALS
(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)
