Article
Materials Science, Composites
Li Zhang, Kun-kun Deng, Kai-bo Nie, Cui-ju Wang, Chao Xu, Quan-xin Shi
Summary: GFs/ZX50 (graphite flakes/Mg-5Zn-0.5Ca) composites were successfully fabricated by ultrasonic-assisted semi-solid stirring followed by extrusion process. The microstructure observation shows that hot extrusion effectively regulates the orientation of GFs. The GFs/ZX50 composites exhibit excellent thermal conductive property of -145.6-174.2 W/(m center dot K) and high yield strength of -386.8-407.8 MPa. The excellent strength-thermal conductivity synergy of the composites is mainly attributed to the highly orientated GFs, the clean Mg-graphite interface, the ultrafine grains, and the MgZn2 nano-precipitates.
COMPOSITES COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
X. Q. Han, N. Lin, A. Q. Li, J. Q. Li, Z. G. Wu, Z. Y. Wang, Y. H. He, X. Y. Kang, C. Ma
Summary: The high-entropy ceramics were successfully produced by spark plasma sintering with varying N contents to investigate the impact of N element on microstructure and properties. The introduction of slight nitrides refined the grain size and enhanced hardness. The wear resistance and thermal conductivity initially increased with greater nitride content before decreasing.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Wang Haoxuan, Liu Qiaomu, Wang Yiguang
Summary: High-entropy ceramics, especially high-entropy transition metal carbide ceramics (HETMCC), have unique properties and are considered potential candidates for the thermal protection system of hypersonic aircraft. However, research on HETMCC is still in the initial stage, requiring further exploration in theoretical design, preparation methods, and property studies.
JOURNAL OF INORGANIC MATERIALS
(2021)
Article
Chemistry, Physical
Xiaolei Yan, Hui Guo, Wei Yang, Shujie Pang, Qing Wang, Ying Liu, Peter K. Liaw, Tao Zhang
Summary: The study demonstrates that increasing the Cr content in Al-Cr-Fe-Co-Ni high-entropy alloys can improve the corrosion resistance and mechanical properties of the alloys. With the increase in Cr content, both the pitting resistance and strength of the alloys are enhanced.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Xiaomeng Zhao, Wei Li, Yunjing Wang, Hao Li, Jianfeng Wang
Summary: This research focuses on modifying graphite film with a multifunctional nanofiber network to meet the thermal management needs of high-power electrical devices in military, automotive, and aerospace fields. The modified graphite film exhibits excellent mechanical and thermal conduction properties, surpassing traditional graphite materials and 7075-type aluminum alloy materials.
Article
Chemistry, Physical
Jinquan Guo, Chaozhongzheng Tang, Huan Sheng Lai
Summary: High-entropy alloys have great potential for application in nuclear power plants due to their excellent mechanical properties and resistance to radiation. In this study, the microstructure and mechanical properties of the Co32Cr28Ni32.Al-94 (4). Ti-06 (3) high-entropy alloy were investigated, revealing a single-phase, disordered, face-centered cubic solid-solution structure with satisfactory yield stress and tensile strength.
Article
Chemistry, Physical
Ao Fu, Yuankui Cao, Zhonghao Xie, Jian Wang, Bin Liu
Summary: A novel non-equiatomic high entropy alloy (HEA) Al15.85Fe11.15Co32.11Cr10.76Ni30.13 was fabricated using a powder metallurgy method. The HEA exhibits a dual-phase microstructure consisting of face-centered-cubic (FCC) and body-center cubic (BCC) phases. It possesses high compressive yield strength, fracture strength, fracture strain, and strength at high temperature due to the uniform dispersion of L12 and B2 nanoprecipitates in the FCC and BCC phases, respectively. This finding provides guidance for the development of high-performance structural materials with a balance of strength and ductility for industrial applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Huaxin Li, Weijian Shen, Weijian Chen, Weizhen Wang, Guohao Liu, Chuanyang Lu, Wenjian Zheng, Yinghe Ma, Jianguo Yang, Zhenyu Ding, Hai Zou, Yanming He
Summary: A high-performance high-entropy alloy (HEA) brazed joint with a microstructure similar to the base metal was successfully fabricated through proper interface control. The joint shear strength was significantly improved with a strengthening mechanism involving high-entropy solid solution, precipitation strengthening, and grain refinement. The brazed joint exhibited desirable high-temperature stability with minor degradation of strength after annealing, showing great potential for high temperature applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Yuxiu Zhang, Honghui Kang, Hiromi Nagaumi, Xuyue Yang
Summary: The effects of Ce additions on the microstructures, mechanical properties and thermal conductivity of lowtemperature extruded Mg-0.9Mn (wt%) alloy were investigated. Ce additions refined the dynamic recrystallized grain and delayed the process. The strength of Ce-containing alloys was improved due to increased dislocation strengthening and precipitate strengthening. The thermal conductivity gradually increased with increasing Ce content. The Mg0.9Mn-0.9Ce (wt%) alloy exhibited comprehensive properties with high strength and high thermal conductivity. This work is important for expanding the industrial applications of Mg alloys.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Coatings & Films
Xiangzhao Wang, Haihua Yao, Li Yuan, Lijia Chen, Fengfeng Xu, Zhen Tan, Dingyong He, Yange Yang, Yanbo Liu, Zheng Zhou
Summary: Al0.6CoCrFeNiTi high-entropy alloy was designed as a metal-based thermal barrier coating with low thermal conductivity and high thermal stability. The atmospheric plasma spray coating exhibited excellent thermal insulation performance, increasing the surface temperature of the piston crown while reducing the temperature along the thickness direction.
SURFACE & COATINGS TECHNOLOGY
(2023)
Review
Materials Science, Multidisciplinary
Jinshan Li, Haoxue Yang, William Yi Wang, Hongchao Kou, Jun Wang
Summary: High-entropy alloys (HEAs) are novel alloys designed based on a new concept, showing excellent engineering properties and unique combinations of microstructures and properties. Studying the phase transition mechanism and mechanical properties of HEAs can deepen the understanding of structure control and performance improvement, leading to potential engineering applications for these alloys.
FRONTIERS IN MATERIALS
(2021)
Article
Chemistry, Physical
X. X. Liu, S. G. Ma, W. D. Song, D. Zhao, Z. H. Wang
Summary: This study investigates the microstructure and mechanical behavior of Co-free Ni2CrFeAl0.3Tix high-entropy alloys. It is found that with an increase in Ti content, the yield and tensile strength of the alloys increase while the ductility decreases. A good balance between strength and ductility is achieved in Ni2CrFeAl0.3Ti0.3 alloy. The findings of this work provide insight into the design of low-cost Ti-containing alloys in the future.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Mechanical
Daixiu Wei, Wu Gong, Tomohito Tsuru, Ivan Lobzenko, Xiaoqing Li, Stefanus Harjo, Takuro Kawasaki, Hyeon-Seok Do, Jae Wung Bae, Christian Wagner, Guillaume Laplanche, Yuichiro Koizumi, Hiroki Adachi, Kenta Aoyagi, Akihiko Chiba, Byeong-Joo Lee, Hyoung Seop Kim, Hidemi Kato
Summary: This study demonstrates that the addition of silicon to CoCrFeNi HEA can improve its performance by maintaining a single-phase FCC structure while simultaneously increasing strength and ductility. The addition of silicon enhances solid solution strengthening, reduces SFE, and improves dislocation behavior and plastic deformation mechanisms.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Si-Chun Luo, Wei-Ming Guo, Yu-Zhang Zhou, Kevin Plucknett, Hua-Tay Lin
Summary: High-entropy (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C ceramics were fabricated with varying amounts of SiC whiskers, leading to an increase in fracture toughness while maintaining nearly unchanged Vickers hardness. The toughness of the ceramic with 20% SiC content was approximately 43% higher than that of the monolithic ceramic. The main toughening mechanisms were crack deflection, whisker debonding, and whisker pullout.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Yisimayili Tuersun, Weiguang Lin, Xu Huang, Wangkang Qiu, Pingjun Luo, Mingdeng Huang, Sheng Chu
Summary: In this paper, we developed high thermal conductive silicone pads with mechanical softness and low cost by utilizing widely used commercial graphite sheets as vertical thermal conductive channels. The composite thermal pad exhibited high through plane thermal conductivity, low thermal resistance, and effectively lowered the CPU temperature and back cover temperature.
Correction
Materials Science, Ceramics
Guo-Qing Li, Min Yu, Guo-Wei Lin, Yun-Long Wang, Li-Xia Yang, Ji-Xuan Liu, Francesco Gucci, Guo-Jun Zhang
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Yue Wu, Weichao Bao, Xiao-Qin Shen, Ji-Xuan Liu, Yuan Qin, Yongcheng Liang, Fangfang Xu, Guo-Jun Zhang
Summary: ZrB2-based solid solution ceramics with different mixing entropies were prepared and it was found that the formation of a single-phase solid solution is independent of the mixing entropy. The addition of other diborides promotes densification and reduces particle size. Samples with higher mixing entropy have finer grain size, higher hardness, and modulus.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yingtong Pan, Ji-Xuan Liu, Tian-Zhe Tu, Wenzhong Wang, Guo-Jun Zhang
Summary: The notion of entropy engineering has revitalized the research and development of sophisticated functional materials. High-entropy materials, particularly high-entropy alloys, have gained significant attention in environmental science and renewable energy technology. However, systematic research on high-entropy ceramics is still lacking. Recent studies suggest that high-entropy oxides, belonging to high-entropy ceramics, show potential as next-generation catalysts. This review provides an overview of the concept, synthesis methods, and catalytic performance of high-entropy oxides, highlighting their advantages as functional catalytic materials.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Mechanical
Yuzhu Guo, Xudong Chen, Jixuan Liu, Tao Chen, Jin Wu
Summary: The effects of interface roughness on fracture behaviors of rock-concrete specimens are investigated using acoustic emission (AE) and digital image correlation (DIC) techniques. The fracture process of the granite-concrete specimens with different interfacial roughnesses is monitored under three-point bending (TPB) load. The initial fracture toughness and characteristic parameters of the AE are calculated and discussed. A transient critical response equation and a stress-crack opening displacement model for the rock-concrete interface crack opening displacement (COD) based on micro-macro crack interactions are established. The model parameters are determined by the DIC technique, and the fracture energies of interfaces with different roughnesses are calculated based on the model. The validity of the model is verified by comparing the calculation results with those from existing fracture energy calculation methods.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Chemistry, Physical
Fei Li, Lin Zhou, Ji-Xuan Liu, Guo-Jun Zhang
Summary: A simple sol-gel method is used to prepare hierarchical porous silicon carbide (SiC) monoliths. The monoliths have macropores of 4.5 μm and mesopores of 2.0 nm. The porous SiC monoliths have porosities of 71.3%, a specific surface area of 171.5 m(2)/g, and a compressive strength of 7.0 +/- 0.8 MPa.
Article
Materials Science, Ceramics
Lin Zhou, Ji-Xuan Liu, Tian-Zhe Tu, Yue Wu, Guo-Jun Zhang
Summary: This study reports a fast grain growth phenomenon in high-entropy ceramics and suggests that the grain growth behavior in these ceramics is not dominated by the sluggish diffusion effect. XPS analysis reveals the presence of more oxygen vacancies in high-entropy ceramics, which promotes the migration and diffusion of cations and increases the grain growth rate.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Materials Science, Ceramics
Gang Cheng, Ji-Xuan Liu, Yuan Qin, Yue Wu, Guo-Jun Zhang
Summary: In this study, single-phase high-entropy diboride ceramics (HEBs) with 5-9 cations were prepared by spark plasma sintering using self-synthesized HEB powders. The distribution of metal elements in the obtained HEBs was uniform. The thermal conductivity of the ceramics decreased with increased configurational entropy or the number of cation kinds due to the phonon scattering caused by inherent lattice distortion in HEBs. However, this study reveals a weakening tendency of reduction in thermal conductivity for HEBs with more than 6 cation kinds.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Engineering, Environmental
Fei Li, Naokatsu Kannari, Jun Maruyama, Kazuyoshi Sato, Hiroya Abe
Summary: Water pollution caused by dyes is a significant environmental issue, and adsorption technology has been widely used for wastewater treatment. In this study, surface defective hydroxides designed using the high-entropy concept efficiently remove dyes from water. Multi-element hydroxides (MEHs) with different compositions are synthesized through a polyol process and exhibit rapid adsorption kinetics due to increased surface defects. MEH-Quinary and MEH-Ternary show high removal efficiency of over 99.0% within 30 seconds for Congo red and methyl orange, respectively, with pseudo-second-order rate constants two orders of magnitude higher than activated carbon and hydrotalcite. MEH-Quinary also has a high adsorption capacity and potential as an electrocatalyst for oxygen evolution reaction.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Materials Science, Ceramics
Ji-Xuan Liu, Liwei Guo, Yue Wu, Yuan Qin, Yongcheng Liang, Guo-Jun Zhang
Summary: Due to the presence of core effects, the impact of carbon vacancy in high-entropy carbides differs from that of transition metal monocarbides. Nonstoichiometric high-entropy carbides with variable carbon vacancy concentration were fabricated using powder mixtures and spark plasma sintering. The decline rates of lattice constant and elastic modulus were slower in high-entropy carbides with higher carbon vacancy concentration, indicating a more rigid crystalline lattice.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Yu-Yun Cheng, Lin Zhou, Ji-Xuan Liu, Yu-Feng Tan, Guo-Jun Zhang
Summary: This study investigates the grain growth kinetics of high-entropy diboride (HEB) and HEB-SiC ceramics during heat treatment. The results show that the growth of HEB phase is controlled by interface-controlled kinetics in HEB ceramics and grain-boundary pinning in HEB-SiC ceramics. The sluggish diffusion effect and the presence of segregated second-phase particles at the grain boundaries contribute to the grain growth inhibition in the high-entropy ceramic system.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Xiao-Ting Xin, Weichao Bao, Xin-Gang Wang, Xiao-Jie Guo, Ying Lu, Chenxi Zhu, Ji-Xuan Liu, Qiang Li, Fangfang Xu, Guo-Jun Zhang
Summary: High-entropy ceramics (Zr0.2Ti0.2Nb0.2Ta0.2W0.2)C exhibit smaller irradiation-induced lattice expansion, favorable structural evolution, and better performance in irradiation and helium behavior. This study indicates the high potential of high-entropy ceramics in irradiation resistance applications.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Materials Science, Ceramics
Tian-Zhe Tu, Ji-Xuan Liu, Yue Wu, Lin Zhou, Yongcheng Liang, Guo-Jun Zhang
Summary: This study proposed a strategy to improve the properties of rare-earth aluminates (REAlO3) through high-entropy engineering and particulate toughening. High-entropy (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)AlO3 (HEAO)-based particulate composites with different contents of high-entropy (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)(2)Zr2O7 (HEZO) were successfully prepared, exhibiting low thermal conductivity and high fracture toughness.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Materials Science, Ceramics
Yuan Qin, Xiao-Feng Wei, Ji-Xuan Liu, Yongcheng Liang, Guo-Jun Zhang
Summary: High-entropy carbide ceramics with 0-40 at.% nominal carbon vacancy were prepared by adding metal Hf into HEC as a case study. The samples exhibited high density, single-phase structure, and homogeneous distribution of metal elements. The lattice parameters increased gradually with the added Hf content.
ADVANCES IN APPLIED CERAMICS
(2023)
Article
Chemistry, Multidisciplinary
Jian Cui, Xingwei Zheng, Weichao Bao, Ji-Xuan Liu, Fangfang Xu, Guo-Jun Zhang, Yongcheng Liang
Summary: This study synthesized a high-entropy dodecaboride composite (HEDC) with high hardness and electrical conductivity by forming atomic-scale interlocking layers. The HEDC achieves superhardness by inheriting its constituent phases' high intrinsic hardness and restricting dislocation motion, while maintaining excellent electrical conductivity.
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)
