Article
Materials Science, Multidisciplinary
Mehdi Shahedi Asl, Zohre Ahmadi, Farhad Sadegh Moghanlou, Mohammad Vajdi, Mohammadreza Shokouhimehr
Summary: This investigation examines the microstructure and mechanical properties of TiB2-SiC-graphene ceramics. The results show that the system is unreactive, preventing the in-situ nucleation of B4C and TiC phases. While the presence of TiO2 and B2O3 impurities is reduced with the addition of graphene nano-platelets (GNPs), SiO2 is confirmed to be present in the final microstructure. The TiB2 phase exhibits significantly higher hardness and Young modulus compared to the SiC phase.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Ceramics
Florimond Delobel, Julien Cambedouzou, Florence Moitrier, Sebastien Lemonnier
Summary: The study showed that the addition of low sintering aids content can improve the density of sintered β-SiC pellets close to theoretical density. The use of high sintering pressure helps maintain a fine microstructure and pristine cubic crystalline structure while preventing the formation of secondary phases.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Zohre Ahmadi, Mehdi Shahedi Asl, Mohammad Zakeri, Mohammad Farvizi
Summary: In this study, the influence of TiN addition on ZrB2-SiC composite was investigated. The addition of TiN increased the porosity content, resulting in a decrease in flexural strength but an increase in indentation fracture toughness and Vickers hardness.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Duwang Liu, Zengbin Yin, Fuzhou Guo, Xuelin Li, Juntang Yuan
Summary: The joining of alpha/beta-SiAlON ceramic to WC-8Co cemented carbide using Ti-Cu by spark plasma sintering was studied. The interfacial microstructure and phases were analyzed. The effects of joining temperature, holding time, and pressure on the sheer strength of the joints were investigated. It was found that temperature and holding time had greater impacts on the interfacial reaction during the joining process.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Maria Stosz, Sathya Narayanasamy, Jon Bell, Thomas Graule, Dariusz Kata, Gurdial Blugan
Summary: Alumina ceramics were joined using spark plasma sintering technology with zirconium and titanium metals as interlayers. Zr achieved bonding at 800 and 900°C with an applied force of 4.2 kN, and at 900°C with a force of 3 kN. Ti bonded to alumina at 700, 800, and 900°C with an applied force of 3 kN. The bonding properties were influenced by temperature and pressure, and the bonding mechanism involved oxygen diffusion and the formation of reaction products.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Physical
Yu Hong, Jiaqin Liu, Yucheng Wu
Summary: The study prepared 50 vol% SiC/Al composites with different SiC particle size and Al alloy composition using Spark Plasma Sintering. The thermal properties, microstructures, and interface reaction products of the composites were investigated. The optimization of composite components and sintering process parameters were conducted. It was found that SiC particle size and sintering process parameters were crucial for obtaining high thermal-mechanical properties of the composites. The best physical properties were achieved in the 16 μm SiC/6061Al composites sintered at 50 MPa, 8 min, and 520°C, with bending strength of 649 MPa, thermal conductivity of 189 W/(m·K), and coefficient of thermal expansion of 7.9×10-6 K-1 at 50-100°C. XRD and SEM analysis revealed the absence of hazardous reaction product Al4C3 at the interface and the growth of MgAl2O4 and Mg2Si together at the interface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Rubia Hassan, Kantesh Balani
Summary: The sintering mechanisms of ZrB2 and SiC-reinforced ZrB2 ceramic composites were investigated by determining the activation energy of densification in different temperature ranges. The results showed that the addition of SiC changed the prominent densification mechanism and impacted the mechanical performance with systemic increase of sintering temperature.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Ceramics
M. Shahriari, M. Zakeri, M. Razavi, M. R. Rahimipour
Summary: The HfB2-HfC-SiC nanocomposite was successfully produced using spark plasma for the first time, with a self-propagating mode during synthesis and completion at temperatures below 400 degrees Celsius. Thermodynamic calculations and X-ray diffraction confirmed the formation of HfB2, HfC, and SiC phases, with respective crystallite sizes of about 54, 26, and 43 nm determined using the Rietveld method.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
C. Garcia, J. D. Smith, J. Rodriguez, A. A. DiGiovanni, T. W. Scharf
Summary: SiC-TiC-diamond composites were fabricated via spark plasma sintering, and the behavior of composite densification was analyzed. The decomposition of diamond into carbon and the reactions with Si and Ti to form SiC and TiC were observed. The composite density decreased with the increase of hold temperature for uncoated diamond composites, while the porosity fraction increased for TiC-coated diamond composites.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Materials Science, Ceramics
Kirill Podbolotov, Dmitry Moskovskikh, Mohammad Abedi, Veronika Suvorova, Andrey Nepapushev, Kostya Ken Ostrikov, Alexander Khort
Summary: In this study, a new method based on low-temperature reactive spark plasma sintering was developed to produce dense SiC-based ceramics with superior mechanical properties. The controlled formation and decomposition of the in-situ Ti3SiC2 MAX phase enabled the fabrication of engineering ceramics with enhanced compressive strength, elastic modulus, and microhardness. This research has significant potential for practical applications in producing advanced SiC-based ceramics for various purposes and for further understanding and development of high-temperature sintering methods.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Mingcheng Zhu, Lan Zhang, Na Li, Desen Cheng, Jidong Zhang, Shiyao Yu, Hui Bai, Huizhong Ma
Summary: In this study, ternary ZrB2-SiC-MoSi2 composites with different compositions were successfully fabricated by reactive spark plasma sintering. The densification behavior, microstructures, and mechanical properties were investigated. It was found that the addition of MoSi2 could improve the relative density, hardness, and fracture toughness of the composites, and a core-shell structure could be formed to enhance the overall performance.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Sandan Kumar Sharma, Kapil Chaudhary, Yashpal Gupta, Mitjan Kalin, B. Venkata Manoj Kumar
Summary: Spark plasma sintering was used to prepare SiC-TaC composites, and results showed that TaC particles were uniformly dispersed in the SiC matrix. With the increase in TaC content, the hardness decreased while the fracture toughness increased. Erosion testing revealed that the erosion rate increased with the increase in impingement angle and temperature, but decreased with the increase in TaC concentration.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Congcong Zhao, Dabiao Xia, Guangmeng Yang, Na Wang, Chuanyu Cui, Qi Lu, Haowei Deng
Summary: In this study, a W-0.5SiC composite material was prepared by thoroughly mixing 0.5 wt% SiC nano particles and pure tungsten powders using ball milling, followed by the sintering process using Spark Plasma Sintering (SPS). The effect of sintering temperature on the microstructure and mechanical properties of the W-0.5SiC composite was investigated. It was found that the sintering process led to the formation of tungsten carbide (W2C) and silicon oxide (SiO2) phases at the grain boundaries. The grain size of the composite increased with increasing sintering temperature. Parameter fitting based on the grain growth power law suggested that the grain growth of the W-0.5SiC composite during the SPS process was mainly controlled by surface diffusion. The 1800°C sintered W-0.5SiC composite exhibited a hardness of 342.2 +/- 4.3 HV and a compressive strength of 1417 +/- 137 MPa. The deformation behavior of the 1800°C sintered W-0.5SiC composite was investigated using the digital image correlation technique during compressive testing, revealing crack formation at the sample edge or near the surface. The cracks extended parallel to the loading direction and propagated throughout the entire sample in less than 0.2 s.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Chemistry, Physical
Sergey N. Grigoriev, Yuri Pristinskiy, Thet Naing Soe, Alexander Malakhinsky, Mikhail Mosyanov, Pavel Podrabinnik, Anton Smirnov, Nestor Washington Solis Pinargote
Summary: SiC-TiB2-TiC composites with different matrix compositions were successfully fabricated using spark plasma sintering. The mechanical properties of the composites varied with different matrix compositions.
Article
Materials Science, Ceramics
Kejuan Yu, Zengbin Yin, Fuzhou Guo, Juntang Yuan
Summary: In this study, α/β-SiAlON/SiC composite ceramic tool materials were prepared via spark plasma sintering, and the effects of SiC particle content, size, and sintering temperature on the properties of the materials were investigated. The results showed that SiC can inhibit the phase transformation of SiAlON and increase the hardness of the composite. The size of SiC particles affected the densification temperature and microstructure of the composite. The sample with 10 wt.% 100 nm SiC particles sintered at 1700 degrees C exhibited the best properties.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Alessandro De Zanet, Matteo Pedroni, Milena Salvo, Espedito Vassallo, Valentina Casalegno
Summary: A study found that using a fluorine-based plasma process can create a brush-like texture on the surface of SiC/SiC composites, thus improving the joint strength of the connected components.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Jinghua Wu, Milad Kermani, Lei Cao, Bohan Wang, Zhiquan Dai, Le Fu, Chunfeng Hu, Salvatore Grasso
Summary: In this study, a new ultra-fast high-temperature sintering technique was proposed to achieve reactive consolidation and crystallization of the solid electrolyte in a single step within 16 minutes. Compared to conventional crystallization, the samples produced using this technique exhibited better phase purity, reduced Li loss, and improved ionic conductivity. In fact, the specimens achieved a crystallinity of 90% and an ionic conductivity as high as 1.31 x 10(-4) S cm(-1).
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Qiqiang Zhang, Yanchun Zhou, Xingyuan San, Detian Wan, Yiwang Bao, Qingguo Feng, Salvatore Grasso, Chunfeng Hu
Summary: The discovery of a new tellurium-containing layered ternary compound Hf2TeB is described, including its structure and lattice parameters.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Jinghua Wu, Yong Lin, Chunfeng Hu, Salvatore Grasso, Danyang Zhu, Jiang Li, A. Katz-Demyanitcz, Adrian Goldstein
Summary: Ultra-fast high-temperature sintering (UHS) is a simple method to produce small transparent MgAl2O4 spinel parts. By using highly sinter active raw-material based on nano spheroidal particles with a narrow pore size distribution, fast densification can be achieved within 80 seconds at approximately 2200 degrees C. The resulting pellets have a thickness of 0.5 mm, an inline transmittance of T similar to 60% (wavelength = 1.1 mu m), and a Vickers hardness of 13.2 GPa.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Juan Cheng, Qiqiang Zhang, Shuai Fu, Detian Wan, Yiwang Bao, Longsheng Chu, Qingguo Feng, Salvatore Grasso, Chunfeng Hu
Summary: In this study, the i-MAX phase (Mo2/3Y1/3)(2)AlC ceramic material with high purity and density was successfully synthesized. The crystal structure of (Mo2/3Y1/3)(2)AlC and its physical and mechanical properties were investigated, showing promising applications in structural engineering.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Le Fu, Jinghua Wu, Sharath Kumar Manjeshwar Sathyanath, Bohan Wang, Klaus Leifer, Hakan Engqvist, Salvatore Grasso, Wei Xia
Summary: Ultrafast high-temperature sintering (UHS) was used to prepare ZrO2-SiO2 nanocrystalline glass-ceramics (NCGCs) with a high relative density of approximately 95% achieved in about 50 seconds. The UHS technology hindered the formation of ZrSiO4 and cristobalite while enhancing the stabilization of t-ZrO2. The resulting NCGCs exhibited a microstructure of spherical monocrystalline ZrO2 nanocrystallites embedded in an amorphous SiO2 matrix.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Qiqiang Zhang, Bo Wen, Jia Luo, Yanchun Zhou, Xingyuan San, Yiwang Bao, Qingguo Feng, Salvatore Grasso, Chunfeng Hu
Summary: In this paper, a new ternary layered MAX phase Sc2PbC was predicted by combining rare earth element Sc and lead-containing MAX. Sc2PbC with a purity of 87.40 wt% was successfully synthesized and its crystal structure and atomic positions were obtained through X-ray diffraction. The Rietveld refinement results confirmed the typical MAX phase P63/mmc (No.194) space group of Sc2PbC with specific lattice parameters and atomic positions. Scanning electron microscope analysis revealed the typical MAX phase layered microstructure in Sc2PbC bulk. Energy dispersive spectroscopy measurements confirmed the composition of Sc2PbC within the allowable error range, validating it as a new MAX phase compound.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Optics
Andrea Baggio, Matteo Turani, Massimo Olivero, Milena Salvo, Diego Pugliese, Marco Sangermano
Summary: A new system is developed to detect hydrocarbons using optical fiber distributed sensing. The system utilizes a custom-designed optical fiber with silica core and thin silicone cladding, providing quick and selective absorption of oil products and insensitivity to water. By detecting Rayleigh backscattering, the system demonstrates a rapid response to high refractive index hydrocarbons, with a response time of approximately 1 s. Furthermore, in its high-resolution version, the system can accurately locate leakages with an accuracy of 14 cm.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Physical
Andrea Baggio, Fabiana D'Isanto, Fabrizio Valenza, Sofia Gambaro, Valentina Casalegno, Milena Salvo, Federico Smeacetto
Summary: This study reviews and discusses the systematic microstructural characterization of alumina joined to Hastelloy C22((R)) using a commercial active TiZrCuNi alloy, BTi-5, as a filler metal. The contact angles of the liquid BTi-5 alloy measured at 900 degrees C for alumina and Hastelloy C22((R)) were 12 degrees and 47 degrees, respectively, indicating good wetting and adhesion with minimal interfacial reactivity or interdiffusion. The thermomechanical stresses caused by the difference in coefficient of thermal expansion between Hastelloy C22((R)) and alumina were identified as the key issues that needed to be resolved in order to prevent joint failure.
Article
Crystallography
Kinga M. Zawadzka, Fabiana D'Isanto, Krzysztof Mars, Federico Smeacetto, Milena Salvo
Summary: A glass-ceramic coating was developed to protect thermoelectric material based on CoSb3. The coating has properties that match the thermal expansion coefficient, deposition temperature, and working temperature of the material. The coating showed limited protective properties against oxidation.
Review
Chemistry, Physical
Yuhao Wang, Jiapeng Liu, Yufei Song, Jing Yu, Yunfeng Tian, Matthew James Robson, Jian Wang, Zhiqi Zhang, Xidong Lin, Guodong Zhou, Zheng Wang, Longyun Shen, Hailei Zhao, Salvatore Grasso, Francesco Ciucci
Summary: Perovskites have shown great potential in energy conversion and storage technologies. High-entropy perovskites (HEPs) have emerged as a new type of perovskite framework due to their excellent stability and performance. This work reviews the recent progress in HEPs, including synthesis methods and applications, and explores effective strategies for their design through atomistic computations. The outlook of this field provides guidance for the development of new and improved HEPs.
Article
Materials Science, Ceramics
F. D'Isanto, F. Smeacetto, M. J. Reece, M. Salvo
Summary: By designing and testing various oxidation protective coatings, the Politecnico di Torino has developed effective methods for protecting both p- and n-type thermoelectrics from oxidation. The 'glass-ceramic route' has been proven successful in obtaining thermo-mechanically compatible and high-temperature resistant coated thermoelectrics.
ADVANCES IN APPLIED CERAMICS
(2023)
Article
Materials Science, Ceramics
Qiqiang Zhang, Bo Wen, Jia Luo, Yanchun Zhou, Xingyuan San, Yiwang Bao, Longsheng Chu, Qingguo Feng, Salvatore Grasso, Chunfeng Hu
Summary: In this study, two new 312 MAX phases, Zr3PbC2 and Hf3PbC2, were synthesized successfully. They are the first lead-containing 312 MAX phases, and together with M2PbC (M = Ti, Zr, Hf), they form the lead-containing MAX phase family. These two compounds are of great research value due to the extremely low electrical conductivity of Hf2PbC. Their lattice parameters and atomic positions were determined based on the Rietveld refinement results. Additionally, a typical laminar microstructure of Zr3PbC2 and Hf3PbC2 grains was observed.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Milad Kermani, Jinghua Wu, Zexiao Liu, Fei Zuo, Hua-Tay Lin, Chunfeng Hu, Salvatore Grasso
Summary: This study examines the impact of sintering thermal history on the kinetics of grain growth for alumina doped with magnesium oxide. The results show that a high heating rate during sintering inhibits the grain growth rate, while a slow heating rate increases the grain growth constant. The enrichment of magnesium at grain boundaries, favored by short sintering duration, is considered one of the factors contributing to the slowed grain growth rate. Moreover, it is suggested that rapid heating, along with limited grain coarsening driven by surface diffusion and a reduced migration rate of grain boundaries, facilitates the fabrication of translucent alumina without the need for a vacuum or hydrogen atmosphere.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Carla Malinverni, Milena Salvo, Alessandro De Zanet, Fabiana D'Isantoa, Federico Smeacetto, Pierre Bertrand, Georg Puchas, Stefan Schaffoner, Valentina Casalegno
Summary: This work focuses on the joining processes of oxide-based ceramic matrix composites (Al2O3f /Al2O3-ZrO2), which are used as radiant tube furnace components in the steel industry. These components have to operate in harsh environments, and they therefore have to resist corrosion, humidity, and combustion. Two glass-ceramics systems, which have Y2Ti2O7 as their main crystalline phase, as well as specific and optimized properties to withstand severe operating conditions, including temperatures of 900 degrees C, are proposed as joining materials. The adhesion of the glass-ceramics to the composite was found to be excellent after mechanical and thermal tests in which they were in direct contact with a 900 degrees C flame and thermal cycling of between 400 degrees C and 900 degrees C.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(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)
