Article
Materials Science, Ceramics
Songmo Du, Jie Zhang, Fei Li, Zhanglin Chen, Shijia Zhang, Shuo Zhao, Wei Cui, Kexin Chen, Guanghua Liu
Summary: Si3N4 ceramics with tailored gradient in color and microstructure were prepared through a rapid and cost-effective one-step approach. The gradient microstructure was achieved by controlling the sintering temperature and sintering additive content, leading to a gradual change in the β-phase content from 84% to 11%. The Si3N4 ceramics exhibited white color on one side and showed high hardness of 19 GPa and fracture toughness of 7 MPa·m(1/2), making them potentially suitable for bio-implantation applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Jose Antonio Bejarano-Palma, Bibi Malmal Moshtaghioun, Francisco Luis Cumbrera, Diego Gomez-Garcia
Summary: This paper models the growth of ceramic grains in field-assisted sintering techniques using a phase-field model. The results show that strong electric fields affect the sintering process and retard grain growth, contrary to usual statements. The authors propose a hypothesis that non-homogeneities of transport properties at the grains can act as a driving force for sintering.
Article
Materials Science, Ceramics
Qin Zou, Haotian Gu, Yanguo Li, Zhang Li, Pengjie Liang, Yongan Luo
Summary: Multicomponent transition metal boride composite-sintered bodies were prepared and characterized at different sintering temperatures. The results showed diffusion of other compounds into the TiBx phase at lower temperatures due to the nonstoichiometric ratio of TiB1.5 vacancies. Increasing sintering temperature initially enhanced Vickers hardness and fracture toughness, but further increase reduced porosity and increased grain size, leading to a decline. The best properties were obtained at 1800 degrees C.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Vijay Bijalwan, Vladimir Prajzler, Jiri Erhart, Hua Tan, Pavla Roupcova, Dinara Sobola, Pavel Tofel, Karel Maca
Summary: This study demonstrates the feasibility of sintering BCZT powder compacts with good piezoelectric properties using rapid heating rates within one hour of sintering. Samples sintered using rapid pressure-less sintering (PLS) reached a relative density up to 94% and grain sizes of 17-36 μm, acquiring high piezoelectric coefficient d(33) up to 414 pC/N.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Alexandre Margueret, Luca Balice, Karin Popa, Michael Holzhaeuser, Emanuele De Bona, Walter Bonani, Antonio Bulgheroni, Fabienne Audubert, Marco Cologna
Summary: We analyzed the densification of UO2 nanopowders in SPS under different conditions and found that the apparent activation energy of densification in SPS is smaller than that in conventional sintering. We also observed a threshold stress for the transition from pressure-insensitive sintering to pressure-assisted sintering.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
L. Audouard, M. G. Tsoutsouva, N. Horezan, E. Rimpot, J. F. Justin, P. Bertrand, C. Langlade, M. Garcia, A. Julian-Jankowiak
Summary: This study investigated the Spark Plasma Sintering (SPS) of fully stabilised hafnia with yttrium oxide (yttria) and examined the influence of manufacturing parameters on the crystallography, chemistry, and microstructure of the material. It was found that both the amount of yttria and the sintering temperature affected the final composition, lattice parameter, and microstructure of hafnia-based materials. Regardless of the amount of yttrium employed, the main phase was determined to be Y2Hf2O7 with high densification levels.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Songmo Du, Jie Zhang, Fei Li, Zhanglin Chen, Shijia Zhang, Shuo Zhao, Wei Cui, Kexin Chen, Guanghua Liu
Summary: Dual-phase (alpha+beta)-Si3N4 ceramics were prepared by SPS with MgO-RE2O3 and SiO2-RE2O3 as sintering additives. The effect of additives on the phase transition, microstructure evolution, and mechanical properties of Si3N4 ceramics were investigated. The results showed that the type and RE radius of additives have significant influences on the properties of Si3N4.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Claire Mevel, Julie Carreaud, Gaelle Delaizir, Jean-Rene Duclere, Francois Brisset, Julie Bourret, Pierre Carles, Cecile Genevois, Mathieu Allix, Sebastien Chenu
Summary: Transparent polycrystalline ZnGa2O4 ceramics were successfully synthesized for the first time using high-energy ball milling, solid-state reaction, and spark plasma sintering techniques, showing high transmittance and excellent microstructure. This research demonstrates the potential applications of transparent ceramics, including potential expansion into the field of laser emission.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Review
Materials Science, Ceramics
Liu Yan, Zhang Keying, Li Tianyu, Zhou Bo, Liu Xuejian, Huang Zhengren
Summary: Ceramic materials are widely used in aerospace, medicine and energy transportation for their excellent mechanical and chemical properties. Electric-assisted joining technology, with its advantages of low temperature and short time, is of great significance for connecting ceramic materials. This paper focuses on the development of electric-field assisted joining technologies for ceramics and ceramic matrix composites, reviews their research status, and discusses their joining mechanism, interface microstructure, joint strength, influencing factors and limitations.
JOURNAL OF INORGANIC MATERIALS
(2023)
Article
Materials Science, Ceramics
Jiangao Liu, Yang Li, Changgui Cheng, Wei Li, Xufeng Qin
Summary: The effect of temperature on the microstructure and mechanical properties of SiC-TiB2 composite ceramics was investigated using solid-phase spark plasma sintering (SPS). The experimental results showed that the addition of TiB2 can significantly improve the mechanical properties of SiC-TiB2 composite ceramics, while higher sintering temperature leads to a decrease in mechanical properties. The best mechanical properties were obtained at 1750 degrees C.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Nianping Yan, Jianbing Pan, Zhixiang Deng, Muliang Cai, Xinhao Zhao, Jieming Liu, Xilin Wang, Zhidong Jia
Summary: This paper presents a method for flash sintering of ceramic materials at room temperature by applying an electric field and dropwise addition of ethanol. The method is simple, easy to control, and achieves high density ceramic materials with consistent initiation voltage.
Article
Materials Science, Ceramics
Nathan Brard, Johan Petit, Nicolas Emery, Nicolas Horezan, Stephane Bach
Summary: Transparent Y2O3-MgO nanocomposite ceramic was synthesized by sol-gel route and processed through sintering and post-treatments to achieve excellent performance.
CERAMICS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Joao V. Campos, Isabela R. Lavagnini, Viviana Avila, Bola Yoon, Sanjit Ghose, Rishi Raj, Eliria M. J. A. Pallone, Lilian M. Jesus
Summary: This study investigates the Arrhenius behavior of electrical conductivity during flash sintering of 3 mol% yttria stabilized zirconia. Total conductivity was found to follow an Arrhenius-like equation in both dense and green samples, with non-linearity related to furnace temperature. A change in activation energy for conduction prior to the flash event was observed and discussed.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Ceramics
Penghui Li, Mengdong Ma, Yingju Wu, Xiang Zhang, Yukai Chang, Zewen Zhuge, Lei Sun, Wentao Hu, Dongli Yu, Bo Xu, Zhisheng Zhao, Junyun Chen, Julong He, Yongjun Tian
Summary: By using nano-sized powders and SPS technology, high-density B4C ceramics were prepared with enhanced mechanical properties. Under the optimal SPS condition, the sample exhibited improved Vickers hardness, fracture toughness, and flexure strength.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Ali Celik, Gozde Caglar, Yasemin Celik
Summary: This study focuses on the fabrication of porous alumina ceramics using carbon black powders as a pore forming agent and spark plasma sintering technique. The physical, mechanical, and thermal properties of the ceramics were investigated after removing the carbon black particles.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Ian Postuma, Patrizia Sommi, Agostina Vitali, Diyun Shu, Greta di Martino, Laura Cansolino, Cinzia Ferrari, Vittorio Ricci, Chiara Magni, Nicoletta Protti, Setareh Fatemi, Umberto Anselmi Tamburini, Silva Bortolussi, Saverio Altieri
Summary: In Boron Neutron Capture Therapy, the effectiveness relies on the concentration and distribution of boron within the tumour cells. This study demonstrates a technique to colocalize alpha particles and lithium ions with cells, using a neutron autoradiography technique. This method combines images of cells with tracks produced in a solid-state nuclear track detector.
APPLIED RADIATION AND ISOTOPES
(2021)
Article
Physics, Applied
Angelica Baldini, Michele Petrecca, Claudio Sangregorio, Umberto Anselmi-Tamburini
Summary: The study found that highly pure nanostructured ferrite particles can be synthesized using a simple method and densified through high-pressure field-assisted sintering to obtain materials with complex microstructures. During sintering, there was no change in phase composition, and a high degree of densification while maintaining nanometric crystallite size was achieved by using high uniaxial pressure with relatively low sintering temperatures and times.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Biochemistry & Molecular Biology
Roberta Dal Magro, Agostina Vitali, Stefano Fagioli, Alberto Casu, Andrea Falqui, Beatrice Formicola, Lorenzo Taiarol, Valeria Cassina, Claudia Adriana Marrano, Francesco Mantegazza, Umberto Anselmi-Tamburini, Patrizia Sommi, Francesca Re
Summary: Vascular oxidative stress exacerbates the progression of Alzheimer's disease, but antioxidant compounds like cerium oxide nanoparticles may help improve vascular function. CNP restored ROS levels and increased uptake in brain cells exposed to A beta, potentially offering protection against neurotoxicity.
Article
Biology
Ian Postuma, Sara Gonzalez, Maria S. Herrera, Lucas Provenzano, Michele Ferrarini, Chiara Magni, Nicoletta Protti, Setareh Fatemi, Valerio Vercesi, Giuseppe Battistoni, Umberto Anselmi Tamburini, Yuan Hao Liu, Leena Kankaanranta, Hanna Koivunoro, Saverio Altieri, Silva Bortolussi
Summary: Novel criteria of clinical potential and safety have been introduced to evaluate neutron beams for BNCT, showing that even beams rejected by traditional physical measurements can have comparable clinical performance.Radiobiological and dosimetric criteria are effective tools in selecting safe and effective beams for patient treatment, even when standard physical recommendations are not met.
Article
Physics, Applied
Xuan Li, Ying Tu, Simona Pace, Umberto Anselmi-Tamburini, Joe Briscoe
Summary: The core-shell structure with ZnO cores effectively suppresses surface defects, particularly in ZnO synthesized in an OH- rich environment, where the TiO2 shell coating has a stronger passivation effect on the surface defects. Both PL and XPS results confirm the effectiveness of the TiO2 shell coating in passivating surface defects of ZnO nanostructures.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Radiology, Nuclear Medicine & Medical Imaging
S. Cisternino, E. Cazzola, H. Skliarova, J. Amico, M. Malachini, G. Gorgoni, U. Anselmi-Tamburini, J. Esposito
Summary: The study explored using Spark Plasma Sintering (SPS) technique to manufacture yttrium solid targets for efficient Zr-89 radioisotope production. Results showed that the production yield and quality of Zr-89 obtained from SPS manufactured targets were comparable to those from standard yttrium foil targets.
NUCLEAR MEDICINE AND BIOLOGY
(2022)
Article
Nuclear Science & Technology
Gabriele Parisi, Andrea Pola, Davide Bortot, Davide Mazzucconi, Giovanni D'Angelo, Chiara Magni, Ian Postuma, Silva Bortolussi, Nicoletta Protti, Saverio Altieri, Umberto Anselmi Tamburini, Valerio Vercesi, Stefano Agosteo
Summary: This paper presents a novel neutron spectrometer called ACSpect, which consists of a two-stages monolithic silicon telescope detector and an organic scintillator. It is capable of high-resolution measurements in the energy range of 250keV-4MeV.
RADIATION MEASUREMENTS
(2022)
Letter
Multidisciplinary Sciences
Martina Fracchia, Mauro Coduri, Maela Manzoli, Paolo Ghigna, Umberto Anselmi Tamburini
NATURE COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Giorgia Pellavio, Patrizia Sommi, Umberto Anselmi-Tamburini, Maria Paola DeMichelis, Stefania Coniglio, Umberto Laforenza
Summary: This study analyzed the effect of cerium oxide nanoparticles (CNPs) on the functioning of aquaporins (AQPs). The results showed that CNPs increased the diffusion of hydrogen peroxide (H2O2) in cells, especially through AQP8. These findings suggest that CNPs could potentially be used as a pharmaceutical agent in diseases involving oxidative stress.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Energy & Fuels
M. Fracchia, D. Callegari, M. Coduri, U. Anselmi-Tamburini, M. Manzoli, E. Quartarone, P. Ghigna
Summary: Various high and medium entropy oxides with rock salt structures were prepared and studied as anodes for lithium batteries. The reaction mechanisms of these systems are complex and involve conversion reactions. The capacity and reduction potential of these materials depend on the number of components and microstructure of the initial materials. However, the dependence cannot be rationalized based on simple stability logic.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Biology
Agostina Vitali, Maria Paola Demichelis, Greta Di Martino, Ian Postuma, Silva Bortolussi, Andrea Falqui, Chiara Milanese, Chiara Ferrara, Patrizia Sommi, Umberto Anselmi-Tamburini
Summary: In this study, multifunctional boron carbide nanoparticles stabilized with polyacrylic acid (PAA) and a gadolinium (Gd)-rich solid phase were synthesized and their biological activity was evaluated. The incorporation of a fluorophore (DiI) allowed for confocal microscopy imaging of the nanoparticles. Novel correlative microscopy techniques were employed to analyze the interaction and activity of these fluorescent Gd-containing B4C nanoparticles (FGdBNPs) with cultured cells. The results indicate that these nanoparticles have the potential to achieve high boron concentration in tumor cells.
Article
Nanoscience & Nanotechnology
Ketan Lohani, Himanshu Nautiyal, Narges Ataollahi, Umberto Anselmi-Tamburini, Carlo Fanciulli, Paolo Scardi
Summary: The effect of Ag doping on the thermoelectric properties of Cu2SnS3 (CTS) was investigated. Various Cu2Ag(x)Sn(1-x)S3 (0.05 <= x <= 0.25) samples were synthesized and their structural and transport properties were studied. The x = 0.15 sample showed a 10-fold higher power factor than the undoped CTS, and both the x = 0.125 and x = 0.15 samples exhibited the highest zT value of 0.8 at 723 K. The increase in thermal conductivity of Cu2Ag(x)Sn(1-x)S3 samples with Ag substitution was found to be caused by the reduction in scattering of phonons due to the incorporation of Ag. Formation energy calculations revealed the reason for the structural transformation of CTS and similar diamond-like structures towards high symmetry polymorphs by external doping. The increase in zT value was attributed to the optimization of the band gap and the weighted mobility.
ACS APPLIED NANO MATERIALS
(2023)
Article
Electrochemistry
Michele Montalbano, Daniele Callegari, Umberto Anselmi Tamburini, Cristina Tealdi
Summary: Transition metal-based sodium fluoro-perovskite materials were investigated as cathode materials for Na-ion batteries. The study combined experimental and computational techniques to investigate structures, defects, and intercalation properties. The results showed the possibility of modulating the sample's morphology and highlighted the correlation between structure and computational data for controlling both ionic and electronic conductivity.
Article
Materials Science, Multidisciplinary
D. Callegari, M. Coduri, M. Fracchia, P. Ghigna, L. Braglia, U. Anselmi Tamburini, E. Quartarone
Summary: The ever-growing demand for high-capacity Li-ion batteries requires electrode materials that are environmentally friendly, Co-free, secure, and durable. In this study, a novel dual-doping strategy was proposed to design LiFexMn2-x-yTiyO4 (LFMT) as high-capacity cathode materials. The substitution of Mn with Fe and Ti suppressed the unwanted distortion and improved the capacity and stability of the batteries.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Tae Wook Heo, Saad A. Khairallah, Rongpei Shi, Joel Berry, Aurelien Perron, Nicholas P. Calta, Aiden A. Martin, Nathan R. Barton, John Roehling, Tien Roehling, Jean-Luc Fattebert, Andy Anderson, Albert L. Nichols, Steven Wopschall, Wayne E. King, Joseph T. McKeown, Manyalibo J. Matthews
Summary: This paper presents the development of an integrated mesoscale digital twin framework for studying the processing conditions, microstructures, and mechanical responses of AM metals, focusing on laser powder bed fusion. Through coupling modeling and simulation capabilities, investigating and controlling AM microstructural features, along with reviewing prior case studies and new mechanical response modeling results.
JOURNAL OF PHYSICS-MATERIALS
(2021)
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)
