Article
Materials Science, Multidisciplinary
Hossam M. Yehia, Peter Nyanor, Walid M. Daoush
Summary: The study aimed to enhance the electrical and thermal properties of composite materials by coating alumina particles with graphene nanosheets produced from exfoliating graphite through mechanical ball milling. The adhesion between the matrix and reinforcement was also improved in this process. The results showed that the addition of 7.5 wt% Al2O3-GN reinforcement significantly increased the hardness, electrical conductivity, and compressive strength of the composite material.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Ceramics
Wenshuo Kang, Xiaojie Guo, Zhiyong Zhou, Ruihong Liang
Summary: In this study, hot-press sintering combined with an oxygen atmosphere was used for the first time to prepare high insulation and electrical breakdown resistance ceramics. By adjusting the sintering temperature and applied pressure, controllable grain size could be achieved. X-ray photoelectron spectroscopy results confirmed the avoidance of heterovalent Fe ions generation and improved resistivity of BF-BT ceramics at high temperatures. The oriented growth of the sample along the (1 1 0) direction was observed and the refined X-ray diffraction analysis revealed changes in the lattice structure. The hot-pressed samples showed larger polarization strength and excellent temperature stability.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Siqi Guan, Chen Xu, Yuanjiang Chen, Yongjin Zhang, Lixiang Li, Han Zhang, Baigang An, Haiming Yang, Weimin Zhou, Chengguo Sun, Dongying Ju, Xin Geng
Summary: In this work, cage-like structure materials (HRPOSS) derived from the in situ hydrogen reduction of polyhedral oligomeric silsesquioxane (T8-type POSS) were constructed as an Si@C anode for Li-ion batteries. HRPOSS-6 exhibited faint volume changes and fast ion-electron kinetics due to the intriguing features of the Si/N double gradient and even-distributed silicon. The uniformly immobilized nano-silicic and concentration gradient were favorable for accelerated ion migration, resulting in good electrochemical performances.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Dominik Knozowski, Pradeep Vallachira Warriam Sasikumar, Piotr Madajski, Gurdial Blugan, Maria Gazda, Natalia Kovalska, Monika Wilamowska-Zawlocka
Summary: In this study, ternary silicon oxycarbide/graphite/tin (SiOC/C/Sn) nanocomposites were characterized and their electrochemical performance as anodes for lithium-ion batteries was evaluated. The incorporation of graphite in the composite improved electrical conductivity and material softness, which are crucial for long term stability during charge and discharge cycles. The use of graphite also allowed for an increase in the tin precursor content without sacrificing electrochemical stability. The ternary composites demonstrated higher charge/discharge capacity compared to the binary SiOC/Sn composite, but were more sensitive to high current rates due to the presence of graphitic carbon.
Article
Construction & Building Technology
Zhenhua Ren, Junbo Sun, Weichen Tang, Xiantao Zeng, Hao Zeng, Yufei Wang, Xiangyu Wang
Summary: The addition of nano-graphite and magnetite improves the electrical behavior and mechanical strength of the electrically conductive cementitious composite (ECCC). Chemical activation and ultrasonic vibration enhance the dispersion of graphite and magnetite. The combined surface treatment shows the best improvement in the mechanical properties and electrical conductivity of the composite.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Berenice Kramer, Yuanbin Deng, Jonathan Lentz, Christoph Broeckmann, Werner Theisen, Sebastian Weber
Summary: This study introduces the method of in-situ resistivity measurement to measure M-S during an integrated HIP heat-treatment process, demonstrating the stabilizing effect of pressure on the M-S temperature of AISI H11 by up to 90K.
Article
Nanoscience & Nanotechnology
Wendong Liu, Zhihui Lei, Rui Yang, Wenkui Xing, Peng Tao, Wen Shang, Benwei Fu, Chengyi Song, Tao Deng
Summary: This paper investigates the effects of hot pressing on the electrical and thermal performance of acid-treated thick conducting polymer PEDOT:PSS films. The study reveals that hot pressing significantly enhances the electrical and thermal conductivity of the films, which can be attributed to the optimized morphology and microstructures. The hot-pressed PEDOT:PSS films show potential applications in flexible electronics and thermal management.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Ceramics
Pavol Sajgalik, Zanlin Cheng, Xuxu Han, Chengyu Zhang, Ondrej Hanzel, Jaroslav Sedlacek, Tatyana Orlova, Maksym Zhukovskyi, Alexander S. Mukasyan
Summary: The high-temperature compression creep properties of additive-free beta/alpha silicon carbide ceramics fabricated by rapid hot pressing were investigated, showing the ceramics had the lowest creep rate reported in the literature within certain temperature and pressure ranges. The average creep activation energy and stress exponent remained constant along the whole range of investigated parameters, suggesting a creep mechanism involving GB sliding accommodated by GB diffusion and beta-alpha SiC phase transformation.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Ni Yang, Xuanyi Zhang, Lewis Reynolds, Divine Kumah, Chengying Xu
Summary: A facile and novel processable method using polymer-derived ceramics (PDCs) is reported for synthesizing Ni nanoparticles (Ni NPs) in the silicon oxycarbide (SiOC) ceramic system, allowing control over their size. The specific structural characteristics and magnetic properties of Ni NPs/SiOC composites with varying carbon content were systematically investigated. It was found that the size of the Ni NPs determines their superparamagnetic behavior, with the magnetic properties changing with NP size and measurement temperature.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Ceramics
Yanghee Kim, Ji Yeong Lee, Min Kyung Cho, Jae-Pyoung Ahn, Young-Wook Kim
Summary: The electrical properties of polycrystalline ceramics are primarily influenced by the presence of grain boundaries or cores, with the electrical resistivity slowly increasing with an increase in the number of boundaries.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Rui Tang, Hetuo Chen, Guohong Zhou, Jianhua Nie, Xianpeng Qin, Zhenhai Xue
Summary: The phase composition, microstructure, electrical and thermal properties of hot-pressed AlN-2 wt% Yb2O3-4 wt% Sm2O3-x wt% TiN (x = 0, 0.4, 0.8, 1, 2, 3, 4) ceramics were investigated. The addition of Yb2O3 and Sm2O3 resulted in densely sintered samples due to the formation of secondary phases. At temperatures higher than 1700 degrees C, the resistivity of AlN ceramics with 2 wt% Yb2O3-4 wt % Sm2O3 significantly decreased. Addition of TiN from 0.4-4.0 wt% reduced the resistivity while maintaining thermal conductivity and high compactness at 1650 degrees C.
CERAMICS INTERNATIONAL
(2023)
Article
Construction & Building Technology
Jianwei Li, Qirong Qin, Junbo Sun, Yongzhi Ma, Qia Li
Summary: The study investigates the feasibility of utilizing electrically conductive cementitious composite (ECCC) in various applications. It is found that while graphite significantly improves conductivity, it also reduces the mechanical performance. By incorporating steel slag and blast furnace slag as substitutes for graphite, the mechanical and conductive performance of ECCC can be improved.
STRUCTURAL CONCRETE
(2022)
Article
Chemistry, Physical
Minkyeong Ku, Dohyub Park, Minjun Kim, Minsu Choi, Wonchang Choi
Summary: Silicon is gaining attention as a high-capacity anode material for lithium-ion batteries due to its high theoretical capacity and low discharge potential. However, the volumetric change and unstable solid electrolyte interface (SEI) of silicon limit its commercialization. In this study, a silicon-based composite embedded in a silicon oxycarbide (SiOC) matrix was developed, with the introduction of hydrophobic reduced graphene oxide (rGO) onto a tannic acid (TA) modified silicon surface to improve dispersion. The Si/rGO/SiOC composite exhibited a high reversible capacity and excellent electrochemical properties, proving its potential as an efficient anode material for LIBs.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
He Zhang, Liangcao Yin, Qingfeng Liu, Yazhong Chen, Shi Jin, Kesong Xiao, Huanyu Zhu, Xianlong Zhang, Xueping Wu
Summary: Halloysite-based mullite/carbon composites were fabricated using hot-pressing technique with low-cost HAL clay and chitosan. The study investigated the effects of sintering temperatures and carbon on the evolution of phases, microstructure, density, strength, and toughness of the composites. The incorporation of carbon enhanced the formation of silica-rich liquid phase and mullitization due to its excellent thermal conductivity, resulting in improved mechanical properties and electrical conductivity.
APPLIED CLAY SCIENCE
(2023)
Article
Engineering, Environmental
Dimberu G. Atinafu, Seong Jin Chang, Umberto Berardi, Ki-Hyun Kim, Sumin Kim
Summary: The combination of metal-organic frameworks (MOF) and graphite in nanocomposites shows potential for developing shape-stable phase change materials (PCMs) with improved energy storage capacity. The composite exhibited high energy storage capacity, low electrical resistivity, and enhanced thermal stability, making it suitable for applications in electro/thermal energy management systems.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Materials Science, Ceramics
Rohit Malik, Eui-Hyoun Ryu, Young-Wook Kim
Summary: This study successfully achieved the joining of liquid phase sintered SiC ceramics using magnesia-alumina-silica (MAS) glass-ceramic fillers without applied pressure. The research found that the filler composition and joining temperature significantly affected the joint strength, with the joint strength being inversely proportional to the interlayer thickness.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Review
Materials Science, Ceramics
Taraknath Maity, Young-Wook Kim
Summary: The study highlights the importance of minimizing additive content, carefully selecting additive composition, and using additive compositions without Al compounds for achieving high flexural strength and excellent RT strength retention at temperatures equal to or above 1500 degrees C in high-temperature ceramic SiC.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Shalini Rajpoot, Eun Seo Kang, Young-Wook Kim
Summary: The study found that as the sintering temperature of zeolite-based ceramics increased from 500 to 600 degrees Celsius, the porosity decreased, while the flexural strength and thermal conductivity increased. Ceramics sintered at 550 and 600 degrees Celsius showed high stability and water absorption capacity.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Eun Seo Kang, Young-Wook Kim, Kwang-Young Lim, Seoung-Jae Lee
Summary: A novel quaternary additive composition was proposed for the preparation of FCM pellets. Successful preparation of FCM pellets with high thermal conductivity was achieved through pressureless sintering.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Zhiheng Huang, Xiaoting Luo, Dechang Jia, Hua-Tay Lin, Yuezhong Meng, Young-Wook Kim
Summary: A systematic and extensible framework for quantification of structural hierarchy is crucial for understanding the structure-property correlation of SiC ceramics. The microstructural hierarchy descriptor (mu SHD) can be used to identify correlations between properties and different hierarchical levels in the microstructure. Different levels of hierarchy in the microstructure can affect the mechanical strength, toughness, thermal conductivity, and electrical resistivity of SiC ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Engineering, Mechanical
Sandan Kumar Sharma, Luv Gurnani, Manoj K. Jangid, K. V. Mani Krishna, Amartya Mukhopadhyay, Young-Wook Kim, B. Venkata Manoj Kumar
Summary: Dual-beam FIB/FEG-SEM and TEM/HRTEM observations provide important insights into the micro-mechanisms of material removal and the role of WC in SiC and SiC-50 wt% WC composite disks worn against SiC ball.
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
Materials Science, Ceramics
Gyoung-Deuk Kim, Young-Wook Kim, Seok-Min Yong, Wook Ki Jung
Summary: A strategy of incorporating B4C to improve the specific stiffness of SiC ceramics was developed. The incorporation of B4C effectively increased the specific stiffness of SiC ceramics as B4C has a lower mass density and higher Young's modulus. B4C also served as an effective additive for sintering SiC ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Jeong-Ah Yeom, Young-Wook Kim
Summary: The electrical, thermal, and mechanical properties of porous SiC ceramics can be controlled by adjusting the C content and sintering temperature. Within a certain range, increasing C content and sintering temperature can decrease the electrical resistivity and increase the thermal conductivity and flexural strength. The porosity of porous SiC ceramics can be independent of the thermal conductivity and flexural strength by controlling C content and sintering temperature.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Jeong-Ah Yeom, Eun Seo Kang, Young-Wook Kim, Woo Hyun Nam
Summary: The intrinsic microstructure and crystalline phases of porous SiC ceramics with 5 vol% AlN-RE2O3 (RE = Sc, Y, Lu) additives were characterized. The flexural strength and thermal conductivity of the ceramics were successfully tuned using different additive compositions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
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, Ceramics
Hyoung-Jun Kim, Eun Seo Kang, Young-Wook Kim, Kwang-Young Lim, Seoung-Jae Lee
Summary: The effects of the starting SiC powder (alpha or beta) with the addition of 5.67 wt% AlN-Y2O3-CeO2-MgO additives on the residual porosity and thermal conductivity of fully ceramic microencapsulated (FCM) fuels were investigated. The study found that FCM fuels prepared using alpha-SiC powder had lower porosity and higher thermal conductivity, suggesting it as a promising method for optimizing FCM fuel preparation.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Frantisek Simko, Zoltan Lences, Young-Wook Kim, Martin Nosko, Martin Kontrik, Michal Korenko
Summary: Electrically conductive nitrogen-doped SiC ceramics were exposed to molten FLiNaK at different temperatures and durations in an Ar atmosphere. The SEM-EDX investigations revealed that the corrosion attack primarily occurred at the intergranular phase and partially dissolved the SiC grains. It was demonstrated that N-doped SiC exhibited good corrosion resistance against molten FLiNaK, with varying thicknesses of the corroded layer observed after different durations of corrosion.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Jeong-Ah Yeom, Young-Wook Kim, Wook Ki Jung, Dong-Ik Cheong, Eul Son Kang
Summary: This study investigated the effects of B4C content on the specific stiffness, mechanical properties, and thermal properties of pressureless-sintered SiC ceramics. SiC ceramics with 2.5 wt% C and 0.7-20 wt% B4C as sintering aids were successfully sintered to over 99.4% of theoretical density at 2150 degrees C in Ar. The specific stiffness of SiC ceramics increased from 136.1 x 106 to 144.4 x 106 m2 & BULL;s- 2 as the B4C content increased from 0.7 to 20 wt%.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Dulal Das, Maria Dolores Sosa Lucio, Shynar Kultayeva, Young-Wook Kim
Summary: The effects of pore size on the electrical and thermal properties of porous SiC ceramics were investigated. It was found that increasing the pore size resulted in higher electrical and thermal conductivities. This can be attributed to the smaller pore/strut interface area in ceramics with larger pore size, reducing the scattering effects and enhancing the conductivities.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
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)