Article
Materials Science, Ceramics
Douglas E. Wolfe, Patrick E. Albert, Caillin J. Ryan, Justin A. Reiss, Sergei P. Stepanoff, Petr A. Kolonin
Summary: By optimizing the FAST processing conditions, dense (Hf,Ta)C ceramics without the need for sintering aids can achieve high mechanical properties, primarily influenced by solid solution strengthening and the Hall-Petch effect.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Jingkun Xu, Zetan Liu, Jie Zhang, Fei Li, Xiaowei Qin, Shan He, Zhipeng Xie
Summary: The effects of different DC electric fields (0-167 V/cm) on the liquid-phase hot pressing of Si3N4 ceramics were investigated in this study. It was found that the application of a DC field could promote the phase transformation of Si3N4 near the cathode while inhibiting it near the anode. Additionally, the migration of Mg2+ and Y3+ ions driven by the DC field was observed, but the graded phase transformation phenomenon was linked to the Peltier effect.
SCRIPTA MATERIALIA
(2022)
Article
Metallurgy & Metallurgical Engineering
Rao Wei-dong, Liu Yao, Cheng Li-jing, Liu Shao-jun
Summary: In this study, dense Si3N4 ceramics were successfully fabricated using a combination of sintering additive and field assisted sintering. It was found that adjusting process parameters could effectively improve specimen density, while higher applied pressure strengthened the densification dynamic process. Additionally, grain boundary slipping played a dominating role in the densification of stereolithographic Si3N4 ceramics.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Materials Science, Ceramics
O. H. Borges, A. L. F. Cardoso, M. H. Moreira, R. F. Klein-Gunnewiek, V. C. Pandolfelli
Summary: Recent studies have shown that ZnO can promote the formation of gahnite (ZnAl2O4) in alumina-based refractories and have high microwave absorption capabilities. In this study, microwave sintering was used to process ZnO-containing alumina-based refractory castables. The microwave-processed samples exhibited higher densification, improved mechanical properties, faster sintering, and lower energy consumption compared to conventionally produced samples, attributed to the electromagnetic-assisted sintering. Additionally, controlling the atmosphere during microwave sintering reduced zinc volatilization and the formation of small pores in the refractory matrix.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Industrial
XinXin Li, JianGuo Wang, YuLiang Zhao, HaiBo Ke, ZhenZhong Sun, Chao Yang, WeiHua Wang
Summary: Pulsed electric current sintering (PECS) is a rapid consolidation method that accelerates the densification process. However, the non-thermal effects of PECS are not well understood. This study investigates the thermal and non-thermal effects of PECS on densification behaviors by introducing an electrically insulative material and validates the modified model with experimental data.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Elizaveta P. Simonenko, Nikolay P. Simonenko, Eugeniy K. Papynov, Oleg O. Shichalin, Anton A. Belov, Ilya A. Nagornov, Philipp Yu Gorobtsov, Nikolay T. Kuznetsov
Summary: The potentials of producing ceramic materials Ta4HfC5 and Ta4HfC5-30 vol% SiC at relatively low temperatures (1700 and 1800 degrees C) were studied through reactive spark plasma sintering of highly dispersed powders Ta2O5-HfO2-C and Ta2O5HfO2-C-SiC. The introduction of silicon carbide not only stimulated the consolidation process and the formation of a solid solution with Ta4HfC5 composition, but also increased the oxidation resistance of the carbide ceramics. Oxidation resistance of the obtained ceramic materials was evaluated by thermal analysis and exposure to laser radiation in atmospheric air.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Jiaojiao Gao, Jinpeng Song, Yao Wang, Zhuo Wang, Jianping Song, Xuedong Zhao
Summary: This study fabricated functionally graded TiCN-TaC ceramics using a layer processing method based on vacuum hot-press sintering technology. Microstructural investigation revealed a visibly layered structure with flat boundaries between layers. The hardness and flexural strength of the ceramics increased and then decreased with increasing sintering temperature.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Van-Huy Nguyen, Seyed Ali Delbari, Mehdi Shahedi Asl, Quyet Van Le, Mohammadreza Shokouhimehr, Mohsen Mohammadi, Abbas Sabahi Namini
Summary: The addition of Si3N4 and carbon nanotubes (CNTs) to TiC improves its thermal conductivity, flexural strength, and hardness. Both additives individually had negative effects on TiC density, but together they resulted in a near fully dense composite. The combination of Si3N4 and CNTs led to smaller grain size, denser microstructure, and increased thermal conductivity, hardness, and flexural strength in the ceramic.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
R. W. Harrison, J. Morgan, J. Buckley, S. Bostanchi, C. Green, R. White, D. Pearmain, T. Abram, D. T. Goddard, N. J. Barron
Summary: In this study, cerium dioxide was densified using conventional and field-assisted sintering techniques. The effects of various sintering parameters on the microstructure of the ceramics, including temperature, hold time, atmosphere, electric field strength, and polarity, were examined.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Bastian Kraft, Susanne Wagner, Karl G. Schell, Michael J. Hoffmann
Summary: The electrical conductivity of Nb-Al2O3 composite materials prepared using the Field-assisted sintering technique (FAST) was investigated. The study found that the percolation threshold is influenced by the particle size of the starting powders and the volume contents of the refractory metal. The microstructure was also found to affect the resulting material properties at the macroscopic scale.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Engineering, Manufacturing
Meng Li, Hai-Lu Huang, Jia-Min Wu, Ya-Ru Wu, Zhang-Ao Shi, Jing-Xian Zhang, Yu-Sheng Shi
Summary: In this study, Si3N4 ceramics were successfully fabricated by DLP technology using Si3N4 powder coated with Al2O3-Y2O3 sintering additives. The research systematically studied the effects of the coating amount of sintering additives on the properties of the ceramics. The results provide an experimental basis for DLP forming Si3N4 and other non-oxide ceramics.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Ceramics
Somnath Sinhamahapatra, Chandrima Ghosh, Himansu Sekhar Tripathi, Sunanda Mukhopadhyay
Summary: The magnesium aluminate spinel was prepared from constituent oxides through a solid-state sintering process at temperatures ranging from 1550 to 1700 degrees C in a normal air atmosphere. The addition of TiO2 and Yb2O3 improved the densification and mechanical properties of the magnesia-rich spinel, with Yb2O3 showing better performance in room temperature flexural strength.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Zahid Anwer, Shuigen Huang, Jozef Vleugels
Summary: Two-phase fully dense high entropy carbide cermets were successfully prepared using conventional processing route. A homogeneous high entropy carbide phase was obtained through liquid phase sintering at 1420 degrees C. Thermodynamic simulations, thermogravimetry, differential scanning calorimetry analysis, electron probe microanalysis, and nanoindentation were performed to study the phase evolution and mechanical properties of the material.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Polymer Science
H. Boulman, A. Mdarhri, I. El Aboudi, C. Brosseau, O. Lame, D. He, J. Bai
Summary: This study investigates the effect of compaction pressure on the mechanical properties of sintered PTFE. The results show that the compaction pressure significantly influences the elastic and plastic mechanical characteristics of PTFE. By analyzing experimental data and using mathematical models, it is concluded that using an optimum compaction pressure during the sintering process can improve the mechanical behavior of PTFE materials.
Article
Chemistry, Physical
Joanna Wachowicz, Tomasz Dembiczak, Grzegorz Stradomski, Zbigniew Balaga, Marcin Dyner, Jacek Wilkowski
Summary: This paper discusses the possibility of obtaining WCCo composite materials using the SPS method, which was characterized and tested for performance, showing that the SPS method can produce solid composites.
Article
Materials Science, Ceramics
Gert Himpel, Mathias Herrmann, Soeren Hoehn
CERAMICS INTERNATIONAL
(2015)
Article
Materials Science, Ceramics
M. Herrmann, K. Sempf, K. Kremmer, M. Schneider, A. Michaelis
CERAMICS INTERNATIONAL
(2015)
Article
Materials Science, Ceramics
Olga Ravkina, Jan Raethel, Armin Feldhoff
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2015)
Article
Materials Science, Ceramics
V. G. Kolesnichenko, O. B. Zgalat-Lozinskii, V. T. Varchenko, M. Herrmann, A. V. Ragulya
POWDER METALLURGY AND METAL CERAMICS
(2015)
Article
Materials Science, Ceramics
C. Schimpf, H. Schumann, J. Raethel, M. Herrmann, D. Rafaja
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2016)
Article
Materials Science, Ceramics
Maik Thiele, Mathias Herrmann, Christin Mueller, Alexander Michaelis
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2016)
Article
Materials Science, Ceramics
J. C. Garrett, I. Sigalas, M. Helimann
CERAMICS INTERNATIONAL
(2014)
Article
Materials Science, Multidisciplinary
M. Herrmann, B. Matthey, T. Gestrich
DIAMOND AND RELATED MATERIALS
(2019)
Article
Chemistry, Physical
Benjamin Hering, Anne-Kathrin Wolfrum, Tim Gestrich, Mathias Herrmann
Summary: The research found that the TiN coating reacts with cBN at temperatures above 1200 degrees C in argon, forming a porous TiB2 layer, while no reaction occurs in nitrogen up to temperatures of 1600 degrees C. Nonetheless, the 20 and 50 nm thin coatings also undergo a recrystallization process during heat treatment up to temperatures of 1600 degrees C.
Article
Chemistry, Physical
Chao Liu, Anne Guenther, Yuanbin Deng, Anke Kaletsch, Mathias Herrmann, Christoph Broeckmann
Summary: Researchers investigated the curvature and stress distribution in metal-ceramic laminates (MCLs) using analytic solutions and FE simulations, finding that the CTE and height ratio have a greater influence on curvature, and the interface significantly prevents curvature, providing insights for avoiding delamination during the manufacturing process.
Article
Engineering, Manufacturing
Lea Schmidtner, Hannes Heinrich, Marcel Fuchs, Anke Poetzsch, Stefan Janz, Mathias Herrmann, Christos Aneziris, Thomas Kaden
JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING
(2020)
Article
Materials Science, Ceramics
Diletta Giuntini, Jan Raethel, Mathias Herrmann, Alexander Michaelis, Christopher D. Haines, Eugene A. Olevsky
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
(2016)
Article
Materials Science, Ceramics
Diletta Giuntini, Jan Raethel, Mathias Herrmann, Alexander Michaelis, Eugene A. Olevsky
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2015)
Article
Materials Science, Ceramics
Jesus Gonzalez-Julian, Kevin Jaehnert, Kerstin Speer, Limeng Liu, Jan Raethel, Michael Knapp, Helmut Ehrenberg, Martin Bram, Olivier Guillon
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2016)
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)
