Article
Materials Science, Ceramics
Hongtao Li, Xin Yang, Feixiong Chen, Yuanqi Weng, Qianjun Yan, Junyi Yan, Qizhong Huang
Summary: C/C-ZrC-ZrxCuy composites were prepared using pressure-assisted reactive melt infiltration with Zr2Cu alloy as an infiltrator. The mechanical and ablation properties of the composites were controlled by varying the C/C skeleton density. Higher ceramic content and lower skeleton density resulted in higher compressive and flexural strength. The composites with a skeleton density of 1.28 g/cm3 exhibited better mechanical and ablative properties at 2800 degrees C, with a linear ablation rate of 33.70 +/- 1.33 μm/s and a mass ablation rate of 22.39 +/- 2.99 mg/s after plasma flame ablation for 54 s.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Y. Arai, M. Saito, A. Samizo, R. Inoue, K. Nishio, Y. Kogo
Summary: A novel heat-resistant material, carbon fiber-containing refractory high-entropy ceramic matrix composites (C/RHECs), were successfully fabricated for components of hypersonic vehicles. Arc jet tests conducted showed the formation of complex oxides in the oxidized region, indicating the presence of a barrier to oxygen diffusion during oxidation.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Phylis Makurunje, Simon C. Middleburgh, William E. Lee
Summary: This review discusses various approaches to address the high processing temperatures required in reactive melt infiltration (RMI) processing of modern multiphase ceramic matrix composites (CMCs). It focuses on using immiscible phases, miscible phases, silicide phases, and/or silicide eutectics to lower the temperature requirement for RMI, optimizing the composition of incorporated phases, minimizing damage to reinforcing phases, utilizing rapid heating techniques, and developing in situ real-time monitoring systems. Future opportunities include integrating additive manufacturing with RMI, utilizing process modeling, and applying in situ and in operando characterization techniques.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Mingyu Gu, Chunyan Wu, Xingyu Chen, Yu Wan, Yumeng Liu, Shan Zhou, Hongwei Cai, Bi Jia, Ruzhuan Wang, Weiguo Li
Summary: In this research, the temperature-dependent critical inclusion size for microcracking was estimated under residual stress and applied stress for particulate-reinforced ultra-high-temperature ceramic matrix composites. The study also estimated the critical flaw size and applied stress required for the stable growth of radial cracks under different temperatures. The results showed that the sensitivity of the critical inclusion size to temperature was influenced by the applied stress, with higher applied stresses leading to lower sensitivity. Additionally, the crack resistance of ceramic materials with pre-existing microcracks could be improved by increasing the service stress when the stress was low. A temperature-dependent fracture strength model for composites with a pre-existing critical flaw was proposed and showed good agreement with experimental data.
Article
Engineering, Mechanical
T. Reimer, G. D. Di Martino, D. Sciti, L. Zoli, P. Galizia, A. Vinci, M. A. Lagos, N. Azurmendi
Summary: The development of new Ultra High-Temperature Ceramic Matrix Composites (UHTCMC) for use in severe space applications lacks sufficient data regarding the properties influencing structural behavior. This study proposes and applies two different methodologies to investigate the fatigue life of UHTCMCs based on ZrB2-SiC, resulting in the determination of their sigma/N curves.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Ceramics
Ju Yinchao, Liu Xiaoyong, Wang Qin, Zhang Weigang, Wei Xi
Summary: Ultra-high temperature composite ceramic matrix composites were fabricated and their ablation behaviors were investigated. The study found that the composites formed a solid-liquid two-phase dense oxide film after ablation, which greatly improved their ablation performance. These findings have instructional significance for the design and application of ultra-high temperature ceramic matrix composites.
JOURNAL OF INORGANIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Xuetao Shen, Ning Gao, Zeqi Shi, Xi Wang, Leilei Zhang, Jianfeng Huang, Kezhi Li
Summary: The ablation of C/C-ZrC composites at a heat flux of 25 MW/m(2) in a nitrogen plasma torch is characterized by a lower linear ablation rate compared to other composites, mainly due to the formation of ZrN/ZrO2, which blocks chemical reactions and absorbs heat from the plasma jet. Thermochemical ablation, mechanical breakage, and carbon sublimation control the ablation process, with the latter playing a minor role.
Article
Materials Science, Ceramics
Diletta Sciti, Antonio Vinci, Luca Zoli, Pietro Galizia, Simone Failla, Stefano Mungiguerra, Giuseppe D. Di Martino, Anselmo Cecere, Raffaele Savino
Summary: Ultra-high-temperature ceramic matrix composites (UHTCMCs) based on a ZrB2/SiC matrix were used to fabricate reusable nozzles for propulsion. The prototypes, obtained by sintering with either hot pressing or spark plasma sintering, were tested multiple times without observable erosion. The oxidation mechanism involved the formation of a ZrO2 intermediate layer and a silicon oxide (SiO2) layer on the surface, protecting the nozzle from further oxidation.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Materials Science, Ceramics
Sandhya G. Nair, K. J. Sreejith, C. Srinivas, K. Prabhakaran, Renjith Devasia
Summary: Monophasic mullite precursors, aluminosiloxanes, were synthesized using a novel method and characterized. These aluminosiloxanes exhibit low viscosity and high ceramic residue, making them suitable as ceramic matrix precursors for CMCs. The study shows that the composition of the ceramic can be controlled by adjusting the Al/Si ratio of the precursors.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Antonio Vinci, Luca Zoli, Laura Silvestroni, Nicola Gilli, Diletta Sciti
Summary: A significant improvement in mechanical performance was achieved in ZrB2-based ultra-high temperature ceramic matrix composites (UHTCMCs) through the introduction of rare earth oxides, resulting in the formation of ternary boro-carbides of general formula REB2C2. This study investigated the potential routes for synthesizing YB2C2 phases at UHTC sintering temperatures by using different boron sources, and analyzed their microstructure using SEM, XRD, and TEM. The findings showed that the mixture with B4C exhibited the highest selectivity for the formation of YB2C2, and a long carbon fibre reinforced YB2C2 ceramic composite with a flexural strength of 380 MPa was successfully fabricated. The chemical stability of these materials in air was also assessed.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Mechanical
Changqi Liu, Duoqi Shi, Bo Zhang, Xiaoguang Yang, Haofeng Chen
Summary: A novel progressive creep-fatigue damage analysis method based on multiscale information was proposed. Firstly, the strength degradation of SiC fibers and the interface properties under high-temperature fatigue loading were quantitatively described. Then, a micromechanical model incorporating various models and the effect of the braiding angle was utilized to calculate the volume fraction of broken fibers. The damage evolution and service life of SiC/SiC turbine blades were simulated and evaluated as a preliminary validation.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Ceramics
Pietro Galizia, Diletta Sciti, Jon Binner, Vinothini Venkatachalam, Miguel. A. Lagos, Francesca Servadei, Antonio Vinci, Luca Zoli, Thomas Reimer
Summary: This paper presents a comparison study on the microstructures and mechanical properties of different ZrB2-based CMCs produced through different processes. Tensile testing and flexural testing were conducted to assess the structural properties, and for the first time, tensile tests up to 1600 degrees C were performed on UHTCMCs. Despite variations in microstructure, all the ZrB2-based CMCs demonstrated excellent structural properties, even at high temperatures. The study also highlights the influence of porosity and fiber properties on the mechanical behavior of these composites, and discusses the role of residual thermal stresses.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Yuanqi Weng, Xin Yang, Feixiong Chen, Xiaxiang Zhang, Anhong Shi, Junyi Yan, Qizhong Huang
Summary: C/C-SiC-ZrC-Cu composites were fabricated using different infiltration methods, and new phases of Cu6.69Si and Cu3Si were generated during Cu infiltration. The formed phases improved the wettability and interface combination between Cu and the carbon matrix. The ablation tests showed that the CVI SiC content significantly affected the structure of the protective oxide layer and had inverse effects on the ablation rate at different temperatures. The formed Si-Zr-C-O and Si-Cu-CO layers during ablation prevented carbon matrix oxidation.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Jiaxing Shao, Weiguo Li, Haibo Kou, Yong Deng
Summary: A temperature dependent fracture toughness model for whisker-reinforced ceramic matrix composites was developed and its predicted results were compared with experimental data, showing good agreement. Furthermore, the effects of various parameters on the temperature dependent fracture toughness were systematically analyzed, providing insights and suggestions for optimizing and improving composite fracture toughness at different temperatures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Review
Materials Science, Multidisciplinary
Zeyu Fu, Aimin Pang, Heng Luo, Kechao Zhou, Haitang Yang
Summary: This article systematically summarizes the recent research progress of ceramic matrix composites in terms of high temperature stealth performance. The influence of SiC fibers, interfaces, matrix, and meta-structure design on microwave absorption is discussed. The compatibility design of ceramic matrix absorbing composites over microwave and infrared range is also summarized. Future challenges and guidelines are provided to design novel functional high temperature stealth materials, emphasizing the combination of structural and functional performance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)