Article
Materials Science, Ceramics
Xiaotian Guo, Jie Tang, Haotian Chang, Yunzhou Zhu, Yuquan Wei, Xiulan Hu, Zhengren Huang, Yong Yang
Summary: This study successfully prepared SiC ceramic composites with complex shapes and high flexural strength by combining digital light processing (DLP) and reactive solution infiltration process (RMI). A low-absorbance SiO2 cladding layer was formed on the surface of SiC powder, and a photosensitive ceramic slurry with improved curing properties was formulated. Ceramic green bodies were molded using DLP, and then sintered and densified to obtain SiC ceramic composites with desired properties. This approach can effectively reduce the manufacturing cycle and cost of SiC ceramic composites.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Rongda Ye, Jun Wang, Yanna Li, Wanchun Sun, Qizhang Huang, Sheng Gong, Xugang Shu
Summary: A series of eutectic hydrated salts were prepared by mixing Na2HPO4•12H2O and K2HPO4•3H2O, and it was found that adding appropriate deionized water improved their thermal properties; using SiO2 as support, the maximum content of eutectic hydrated salts in composite PCM reached 70%; the addition of nucleating agent in composite PCM reduced supercooling and enhanced material stability.
Article
Materials Science, Ceramics
Rongjun Liu, Fu Wang, Jiaping Zhang, Jing Chen, Fan Wan, Yanfei Wang
Summary: The deposition rate and amount of CVI SiC matrix play a crucial role in the manufacturing of SiCf/SiC composites, as the optimal values can enhance the flexural strength and microstructural homogeneity, while excessive deposition leads to closed pores. Additionally, the hybrid CVI and PIP technique improves the density and reduces porosity of the composites, making them more suitable for various industrial applications.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Remani Sreeja, Palani Prabhakaran Shyin, Cheriyan Suchithra, Deepa Devapal, Payyadakam Veetil Prabhakaran
Summary: Silicon carbide (SiC) foam was densified with beta-SiC through chemical vapor infiltration (CVI) technique after polymer infiltration and pyrolysis (PIP) process. Highly entangled and branched SiC wires of uniform diameter were observed over the struts of open-cell SiC foam, showing a uniform diameter increase with CVI reaction period. The resultant foam exhibited good thermal stability and could be used in various high-temperature applications.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Siwen Yu, Tao Zeng, Xiaotong Pan, Rina Wu, Meiling Fan, Guodong Xu, Su Cheng
Summary: Si3N4-SiC/SiO2 composites were successfully prepared using SLS and infiltration processes, leading to significant improvement in flexural strength. By optimizing the manufacturing process and material compositions, a composite part with complex structure was manufactured, showing promising application potential.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Jiahao Liao, Zhaofeng Chen, Tianru Guan, Yuanhao Li, Qiqiao Xiao, Liping Xue
Summary: The study revealed that using aluminum alloy as the second phase matrix can effectively enhance the performance of Cf/SiC-Al composites, resulting in higher compressive strength and modulus for composites prepared by vacuum pressure infiltration process. However, the filling of aluminum alloy limits the space for fiber deformation, affecting the length of fiber extraction.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Limeng Song, Fan Zhang, Yongqiang Chen, Li Guan, Yanqiu Zhu, Mao Chen, Hailong Wang, Budi Riza Putra, Rui Zhang, Bingbing Fan
Summary: A multifunctional SiC@SiO2 nanofiber aerogel with ultralow density, ultra-elasticity, high temperature resistance, and significant strain-dependent piezoresistive properties was successfully fabricated using chemical vapor deposition and heat treatment methods.
NANO-MICRO LETTERS
(2022)
Article
Materials Science, Ceramics
Tong Zhao, Shixiang Zhou, Hui Mei, Hao Li, Chao Chen, Yongtao Yao, Laifei Cheng, Litong Zhang
Summary: A unique negative Poisson's ratio structure was designed, and its reliability and thermal stability were improved through heat-induced torsion and SiC material enhancement technology. The structure performed well in terms of thermal expansion control and load-bearing capacity.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Guodong Sun, Chen Zhang, Qing Zhang, Yi Zhang, Laifei Cheng, Xingang Luan, Chengpeng Yang
Summary: This study comprehensively evaluated the mechanical properties of continuous SiC fiber reinforced SiC ceramic matrix composites and verified the correlation laws between different properties. The results showed that fiber bridging is the key mechanism controlling this correlation, while interlaminar shear is influenced by matrix cracking and interlaminar pores.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Teng Sun, Dongke Li, Jiaming Chen, Junnan Han, Ting Zhu, Wei Li, Jun Xu, Kunji Chen
Summary: We fabricated un-doped and P-doped Si nanocrystals/Silicon carbide multilayers with different dot sizes (8, 4 and 2 nm) and measured low temperature (77 K) electron spin resonance spectra to investigate the doping effect on electronic structures. The results showed that the g value of un-doped Si nanocrystals remained at 2.005, indicating the presence of dangling bonds on the surface. After P doping, the g value decreased to 1.998 in samples with a dot size of 8 nm, suggesting the introduction of conduction electrons by P impurities. With the reduction of dot size, signals associated with Si vacancies were identified in P-doped samples, indicating the potential application of P-doped Si nanocrystals/SiC multilayers with ultra-small dot sizes in Si-based spintronics.
APPLIED SURFACE SCIENCE
(2023)
Article
Metallurgy & Metallurgical Engineering
Suya Ji, Bin Liang, Chenglong Hu, Shengyang Pang, Rida Zhao, Jian Li, Sufang Tang
Summary: The oxidation behaviors of self-healing SiCf/SiC-SiBCN composites were studied in H2O/O-2 and H2O/O-2/Na2SO4 environments. The involvement of Na2SO4 led to the formation of a loose lamellar oxide layer and accelerated the oxidation of the composites. The composites showed different retention rates of strength depending on the environment, with the maximum retention rate in H2O/O-2 at 1200 ? and the minimum in H2O/O-2/Na2SO4 at 1350 ?.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Materials Science, Ceramics
Xiaoxu Lv, Jiajia Sun, Wei Liu, Jian Jiao
Summary: The CVI process was used to deposit controllable BN interphase on SiC fibers. Various characterization methods were employed to analyze the microstructure and elemental composition of the interphases. The results showed that the BN interphases deposited at temperatures between 900°C and 1200°C were compact and uniform. The deposition temperature had a significant impact on the deposition kinetics, elemental composition, and tensile properties of BN interphase coated fibers.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Yang Zhu, Huali Wei, Liansheng Yan, Hong Cui
Summary: The study used needled carbon fiber preforms to make carbon/carbon composite billets with varying matrix carbon contents through CVI processing time control. Cf/C-SiC composites were then prepared by infiltrating SiC into these billets using PCS. Results showed that higher SiC content led to improved anti-ablation properties, with longer duration tests exhibiting lower ablation rates.SEM images of tested samples illustrated the mechanism and non-linear progression of ablation resistance.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Guodong Sun, Zhiqiang Tan, Qing Zhang, Yi Zhang, Xuqin Li, Qinglai Tian, Yuxing Tang
Summary: High-performance carbon/carbon (C/C) bolts are necessary for connecting thermally-insulating structural components of aerospace vehicles. A new silicon infiltration-modified C/C (C/C-SiC) bolt was developed, and its effects on microstructure and mechanical properties were studied. The study found that silicon infiltration formed a dense and uniform SiC-Si coating, enhancing the load-bearing capacity of C/C bolts.
Article
Materials Science, Ceramics
Zhiyong Ye, Yalei Wang, Qingbo Wen, Yufeng Liu, Congcong Liu, Xiang Xiong
Summary: Twill multidirectional carbon-fiber-reinforced carbon and silicon carbide composites (C/C-SiC) were prepared using chemical vapor infiltration combined with reactive melt infiltration process. Heat treatment was found to significantly affect the microstructure and mechanical properties of the C/C-SiC composites. Increasing the bulk density of C/C preforms improved the flexural and tensile strengths of the composites but decreased the compressive strength.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Yupeng Xie, Ailian Zhu, Min Chen, Keyou Shi, Qiucai Zhang, Guowen Peng, Yong Liu
Summary: Considerable amounts of coal fly ash (CFA) are produced annually without proper utilization. Alkali-activated CFA was introduced to prepare ceramics to treat neodymium-contaminated soil, and its effect on the properties of the ceramics was investigated. The alkali activation of CFA led to a desilication reaction and the generation of new phases rich in sodium, enhancing the mechanical properties of the ceramics. The alkali-activated CFA exhibited higher bulk density and homogeneous distribution of Nd ions in the matrix compared to untreated CFA.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Industrial
Litong Zhang, Yu Guo, Weiwei Qian, Weili Wang, Daoyuan Liu, Sai Liu
Summary: This paper proposes a modelling and online training method for digital twin workshop to address the difficulties in modelling, simulation, and verification. It describes a multi-level digital twin aggregate modelling method and a digital twin organization system. A spatio-temporal data model is constructed based on the data demand for digital twin aggregates. The paper also presents a training method using truncated normal distribution and a verification method based on real-virtual error for digital twin models. The effectiveness of real-time status monitoring, online model training, and production simulation is verified through a case study.
INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH
(2023)
Article
Materials Science, Ceramics
Shenghao Li, Fang Ye, Laifei Cheng, Zhaochen Li, Junheng Wang, Jianyong Tu
Summary: In this study, porous silicon carbide ceramics with multilevel directional pores were prepared using chemical vapor infiltration (CVI) combined with sacrificial template method. A carbon fiber preform with a specific structure was used as a template, and silicon carbide was deposited through the CVI process. The carbon fiber template was then oxidized and removed, resulting in the porous silicon carbide ceramics. The influence of deposition time on pore structure, mechanical properties, and thermal properties was investigated. Compared to the traditional pore-making process, the sacrificial template method produces more regular pores, leading to excellent mechanical and thermal insulation properties. The sample deposited for 72 hours exhibited a porosity of 66.00%, a flexural strength of 67.52 MPa, and a thermal conductivity below 1 W/(m center dot K) from room temperature to 1200 degrees C.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Jinsong Yang, Fang Ye, Laifei Cheng
Summary: Nano-porous titanium carbide (TiC) coating was synthesized in-situ on silicon carbide (SiC) fiber substrate using titanium tetrachloride (TiCl4) vapor. The coating consisted of TiC nanograins and the nanopores were formed by lateral stack growth. The composition and morphology of the coating were controlled by the supersaturation of gaseous reagents at the boundary layer. The flexibility of the SiC fiber was preserved by the optimized TiC coating. Lastly, a SiCf/SiC mini-composite with nano-porous TiC interphase was prepared, exhibiting fiber pull-out and interphase fracture on the fracture surface.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Environmental
Hui Mei, Hao Li, Zhipeng Jin, Liangjun Li, Dou Yang, Chengyu Liang, Laifei Cheng, Litong Zhang
Summary: A lightweight thermal protection/insulation integrated sandwich structure was developed using 3D printing technology and the sol-gel method. The structure consisted of silicon carbide (SiC) ceramic lattice frameworks with a body-centered lattice core (BCLC) and quartz fibers reinforced silica (Qf/SiO2) aerogel filling. The sandwich structure exhibited improved thermal insulation efficiency and mechanical strength compared to the BCLCs. This study provides an efficient and reliable method for the preparation of thermal protection/insulation integrated components.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Mechanics
Zeeshan Ali, Yuekai Yan, Hui Mei, Laifei Cheng, Litong Zhang
Summary: This study investigates the impact of infill density, fill patterns, and composite type on the mechanical properties of carbon fiber reinforced 3D printed nylon composites. The results show that the composite with 50% infill density and triangular fill pattern exhibits the highest tensile strength, Young's modulus, and toughness. The composites in the side build direction have higher tensile strength and Young's modulus but lower toughness compared to the flat build composites.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Manufacturing
Changhui Niu, Qing Zhang, Laifei Cheng, Fang Ye, Litong Zhang
Summary: This study proposes and verifies a simple and cost-effective method to prepare Cf/SiC composites with dispersed C-SiC interphase. The dispersed C-SiC interphase is formed by the diffusion of SiC precursor molecules into the porous carbon coating derived from the decomposition of the sizing agent. The study has a positive application value for the manufacture of composites in terms of significantly reducing the preparation cost and cycle duration.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Chemistry, Physical
Jimei Xue, Song Hu, Xiaoping Li, Fei Li, Yuqiang Liu, Hanjun Wei
Summary: This study investigates the enhancement of microwave absorption performance in SiCN ceramics by introducing Y2O3. By forming Y2O3-SiCN heterogeneous amorphous interfaces, defects, and dipole polarization, a multiple polarization loss mechanism is achieved, resulting in excellent microwave absorption performance in SiCN-Y2O3 ceramics over a wide thickness range.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Shenquan Yang, Haolin Qin, Chunlin Zhou, Hanjun Wei, Pei Feng, Jimei Xue, Zhijun Wang, Feng Zhao, Qingyuan Wang
Summary: This study successfully grew a multidimensional nanostructure, consisting of matchstick-like SiCnws and carbon nanoclusters, in a porous Yb2Si2O7 ceramic using precursor infiltration and pyrolysis. The increase in precursor infiltrations resulted in a higher content of absorber (SiCnws and carbon) and the formation of a multidimensional nanostructure, leading to increased conductivity loss, interfacial polarization loss, and dipole polarization loss. The YbSiOC ceramics with a 28.2 wt% absorber content achieved a minimum reflection loss of -50.0 dB at 9.39 GHz and an effective absorption bandwidth of 4.2 GHz in the X band. The matchstick-like SiCnws and carbon nanoclusters created a multidimensional network structure that facilitated multiple reflections and scattering of electromagnetic waves in YbSiOC ceramics, making them suitable for applications in water-vapor environments.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Xiangyun Gao, Bao Lei, Yi Zhang, Daxu Zhang, Chong Wei, Laifei Cheng, Litong Zhang, Xuqin Li, Hao Ding
Summary: In this study, CT technology and deep learning methods were used to investigate the microstructural features and damage characteristics of SiC/SiC composites, including accurate identification of features such as fibers, interphase, matrix, and cracks, as well as obtaining key characteristics such as porosity, fiber pull-out length distribution, and crack distribution.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Hanjun Wei, Shenquan Yang, Pei Feng, Chunlin Zhou, Jimei Xue, Cunxian Wang, Lianyang Chen, Feng Zhao, Qingyuan Wang
Summary: SiCTi ceramics were prepared by PDCs technology using Ti modified polycarbosilane (PCS), which achieved adjustable dielectric and EM wave absorption properties. The addition of Ti reduced free carbon and induced the growth of SiCnws, resulting in a three-dimensional network structure and multiple loss media. By constructing hetero-interfaces and optimizing the composition, effective EM wave absorption can be achieved in high temperature applications.
MATERIALS CHARACTERIZATION
(2023)
Article
Nuclear Science & Technology
Jie Wang, Qiuyu Sun, Jinshan Gao, Yupeng Xie, Qingyu Si, Xiaoqing Liang, Ji Liu, Dingkang Hu, Pengyu Huang, Sheng Wang, Guoming Liu, Aijun Mi
Summary: Lead is commonly used for X/gamma ray shielding and dosage reduction, but improper recycling can lead to serious hazards. On the other hand, recycling lead from high metal content gamma-ray shielding materials can serve as a secondary metal source and contribute to regulated accumulation and environmental protection. This study focuses on the recovery of lead from waste flexible Vinyl-Methyl-Silicone based gamma-ray shielding materials, with analysis of the effects of pyrolysis temperature and heating rate. Optimum conditions resulted in a lead recovery rate of 57.40 wt% at a pyrolysis temperature of 300°C for 15 minutes, producing a solid product consisting mainly of lead and lead oxides.
PROGRESS IN NUCLEAR ENERGY
(2023)
Article
Computer Science, Interdisciplinary Applications
Weiwei Qian, Yu Guo, Hao Zhang, Shaohua Huang, Litong Zhang, Hailang Zhou, Weiguang Fang, Shanshan Zha
Summary: This article focuses on how to effectively construct DTM synchronous update methods based on dynamic sample data for discrete manufacturing workshop, in order to enhance the accuracy of PP prediction. The proposed model demonstrates good performance in realizing the synchronization of workshop performance in industrial environment, greatly improving the prediction ability for PP.
ROBOTICS AND COMPUTER-INTEGRATED MANUFACTURING
(2023)
Article
Chemistry, Physical
Minggang Zhang, Longkai Pan, Zhipeng Jin, Xiao Wang, Hui Mei, Laifei Cheng, Litong Zhang
Summary: Independent photo-charging technologies based on aqueous zinc-ion batteries (ZIBs) show promise for renewable energy systems. However, the conflict between light utilization and electrochemical performance limits the effectiveness of photo-charging ZIBs. This study proposes and applies 3D light-trapping structures (LTSs) in a rigid VO2/C@SiCuOC electrode to improve light-harvesting efficiency. The optimized 3D electrode demonstrates significantly enhanced photo-response current density and higher energy density, making it a practical solution for clean energy harvest/storage systems.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Shenquan Yang, Lu Tang, Hanjun Wei, Jimei Xue, Zhijun Wang, Qingyuan Wang, Feng Zhao
Summary: This study proposes a Yb2O3/rGO composite with a volcanic rock-like structure, which exhibits outstanding impedance matching and loss capacity and achieves high EM wave performance.
