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Super broadband absorbing hierarchical CoFe alloy/porous carbon@carbon nanotubes nanocomposites derived from metal-organic frameworks

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Journal of Materials science & technology 2022年第23期118卷 218-228页

作者： Siyao Guo Yunfeng Bao Ying Li Hailong Guan Dongyi Lei Tiejun Zhao Baomin Zhong Zhihong Li School of Civil Engineering Qingdao University of TechnologyQingdao 266033China Postdoctoral Workstation Guangdong Dongpeng Holding Company LimitedGuangdong 528031China Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone Qingdao University of TechnologyQingdao 266033China National Key Laboratory of Science and Technology for National Defence on Advanced Composites in special Environments Harbin Institute of TechnologyHarbin 150080China

The exploitation of electromagnetic wave absorption(EMA) materials has attracted ever-increasing attention,not only because electromagnetic wave(EMW) originated from overuse of electronic products has threatened human' health seriously,but also because EMA materials can effectively protect radar stealth from being ***,it is still a challenge to obtain broadband and efficient EMA materials to satisfy practical *** this work,we developed a series of hierarchical CoFe alloy/porous carbon@carbon nanotubes(CoFe/PC@CNTs) nanocomposites through revising the proportion of Fe^(2+) in the metal-organic frameworks(MOFs)(CoFe-ZIF) precursor and one-step simple pyrolysis *** cross deposition between CoFe alloy,carbon nanotubes(CNTs),and porous carbon(PC) formed a double conductive network,favoring for achieving excellent EMA ***,when the filler mass ratio is only 10 wt%,the optimized CoFe/PC@CNTs nanocomposites display the best EMA capability,whose minimum reflection loss(RL_(min)) value is-68.94 dB at 13.69 GHz and the effective absorption band(EAB,<-10 dB) reaches up 9.14 GHz with a matching thickness of 2.63 *** addition,the largest EAB can achieve up to 11 GHz(3.35-14.35 GHz) during all matching *** splendid EMA performance benefits the favorable dielectric loss provided by the double conductive network,the good magnetic loss benefited from the evenly distributed CoFe alloy,the excellent impedance matching,rich transmission paths,and multiple ***,such EMA materials with super broadband absorbing provide desirable candidates for lightweight and high-efficient microwave absorbers.

关键词： Electromagnetic wave absorption CoFe alloy/porous carbon@carbon nanotubes nanocomposites Broadband absorbing Metal-organic frameworks

Exploring the Multi-Scale Evolution Mechanism of the Ultra-High-Temperature Mechanical Behaviour of Carbon/Carbon composites

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SSRN 2024年

作者： Song, Lichao Meng, Songhe Zhang, Ying Yang, Fan Xie, Weihua National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Key Laboratory of Advanced Functional Composite Materials Aerospace Research Institute of Materials & Processing Technology Beijing100076 China

The microstructure and mechanical properties of Carbon/Carbon (C/C) composites were investigated after ultra-high-temperature heat treatment (HTT) in the range of 30 – 2950 °C. The effect mechanism of high temperatures on the mechanical behaviour of C/C composites was proposed for three scales, i.e., graphene sheets, carbon fibre (CF) monofilaments, and C/C composites. The results displayed that the tensile strength of CF monofilaments decreases monotonically as the HTT increases in the range of 2000 – 2950 °C, while C/C composites present a tendency to decrease and then increase, demonstrating that CF/matrix interfacial properties play a decisive role in the tensile properties. The compression and flexural properties showed a trend opposite to the tensile properties, Young’s modulus of both CF monofilaments and C/C composites increases. A turning point in the microstructure of C/C composites was observed after HTT at 2700 °C, in which the graphitisation degree decreases and the size of graphene sheets becomes fluctuating, while the high-temperature mechanical properties began to be superior to room temperature (RT). The high-temperature mechanical properties of C/C composites were regulated by the competing mechanisms of the graphite crystallite structure and the skin-core structure of CF monofilament, the CF/matrix interfacial strength and the porosity of C/C composites. © 2024, The Authors. All rights reserved.

关键词： Carbon fibers

Electric field-induced alignment and orientation of dielectric fibers: Mechanisms, modelling, and experimental analysis

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Ceramics International 2025年

作者： Li, Wenjie Jiang, Yuncong Wu, Lianfeng Wang, Chen Liu, Hang Jiang, Siyi Zhou, Xin Mu, Yuwen Xu, Lingfeng He, Xiaodong Li, Mingwei He, Fei National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology China State Key Laboratory of Marine Coatings Marine Chemical Research Institute Co. Ltd. China National Key Laboratory for Precision Hot Processing of Materials Harbin Institute of Technology China

Electric field-induced alignment of dielectric fibers (DFs) is a promising method for controlling the orientation of fibers in composites. In this work, we investigated the mechanisms of electric field-induced alignment and its influence on the orientation of DFs in a solution medium. Through modelling and experimental analysis, we demonstrate that the application of an electric field to a suspension of DFs results in the fibers alignment along the direction of the field. This alignment process occurs due to the interaction between the electric field and the dipole moments of the fibers. Furthermore, we explore the factors affecting the process of alignment, such as the strength of the applied electric field, the dielectric constants of fibers and solution, and the characteristics of the fibers. Overall, electric field-induced alignment offers a versatile and efficient method, enabling the development of advanced materials with tailored properties for various industrial applications. © Elsevier Ltd and Techna Group S.r.l.

关键词： Dielectric fibers Electric field Directional orientation Analytical modelling

Mechanics model of inner core debonding of interface-reinforced composite honeycomb sandwich beam 5

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Mechanics model of inner core debonding of interface-reinfor...

5th International Conference on Material science and technology, ICMST 2025

作者： Xue, Pengcheng Xiong, Jian Center for Composite Materials and Structures Harbin Institute of Technology Harbin150001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

ISBN: (纸本)9781510691742

Enhanced face-core interfacial bonding performance increases the sensitivity of the structure to core defects. The debonding failure of the inner core in an interface-reinforced composite honeycomb sandwich beam is studied through theoretical modeling and experimental testing. Utilizing the principles of minimum potential energy, Timoshenko's beam theory as well as the Extended High Order Sandwich Panel Theory (EHSAPT), a theoretical model is formulated to clarify the mechanism of inner core debonding. The exponential cohesive zone model (CZM) is used to represent the interfacial mechanical responses of both the face-core and inner core interfaces. Additionally, the theoretical model incorporates the mechanical mechanism of dual crack propagation. The interface-reinforced composite honeycomb sandwich beams are fabricated and the double cantilever beam (DCB) experiments are carried out to reveal the debonding mechanism. The theoretical findings are in accordance with the experimental data when comparing the load-displacement curves and the debonding mode. © 2025 SPIE. All rights reserved.

关键词： Debonding

A Multi-Bionic Design Strategy for Flexible, Efficient and Robust High-Performance Energy Absorption Systems Based on Interlocking Sutures Integrated with Bouligand-Arranging Perforations

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SSRN 2024年

作者： Wang, Chao Li, Jiaxuan Sui, Chao Sang, Yuna Zhou, Yichen Zang, Zifu Zhao, Yushun He, Xiaodong National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China School of Astronautics Harbin Institute of Technology Harbin150001 China

As an emerging protective device, the self-locked systems are lightweight, flexible, customizable, and portable. However, existing systems suffer from a low degree of deformation and mechanically inefficient connection structures. To address these issues, a multi-bionic design strategy for high-performance self-locked system was proposed in this work, which perfectly combines the robust joint structure of the interlocking suture with the efficient deformation mode of the Bouligand structures. In the design process, the interlocking suture-inspired system was first studied separately, and its structural stability and deformation behavior were investigated through FEM simulations and experiments. The results showed that, the self-locked system has good structural stability and scalability, while its deformation degree still needs to be improved when the radius/length ratio of the tube units is small. Therefore, inspired by the efficient deformation mode of the Bouligand structure, perforated self-locked systems were developed by perforating a sequence of holes with Bouligand-like distribution in the sidewalls of the tube units. Simulations show that the perforated systems are not only structurally robust, but also have an efficient deformation mode. Compared to other perforated systems, the double-helix perforated system with four vertical perforations is absolutely dominant in the comprehensive evaluation of various mechanical performance indicators. In addition, experimental results showed that the double-helix perforated system can reduce the weight by 10% while increasing the specific energy absorption by 58% compared to non-perforated systems. Therefore, this multi-bionic strategy can integrate the advantages of different natural structures and provide new insights for the design of high-performance protection systems. © 2024, The Authors. All rights reserved.

关键词： Energy absorption

A universal approach to high-performance thermoelectric module design for power generation (vol 9, 101818, 2025)

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JOULE 2025年第4期9卷

作者： Cheng, Jinxuan Xue, Wenhua Zhang, Tianyu Li, Xiaofang Zhu, Yichen Yin, Li Yao, Honghao Fu, Zixuan Wu, Longzhi Chen, Chen Zhao, Peng Ma, Xiaojing Jiang, Feng Wang, Xiaodong Li, Mingyu Mao, Jun Wang, Yumei Cao, Feng Zhang, Qian School of Materials Science and Engineering and Institute of Materials Genome & Big Data Harbin Institute of Technology Shenzhen 518055 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Science Beijing 100190 China School of Science Harbin Institute of Technology Shenzhen 518055 China Sauvage Laboratory for Smart Materials School of Materials Science and Engineering Harbin Institute of Technology Shenzhen 518055 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China School of Physical Sciences Great Bay University Dongguan 523000 China Institute of Special Environments Physical Sciences Harbin Institute of Technology Shenzhen 518055 China Beijing Branch of Songshan Lake Materials Laboratory Dongguan 523808 China

Thermoelectric modules fabricated by traditional welding fall short of achieving optimal conversion efficiencies, primarily due to performance degradation of materials at high temperatures, severe elemental diffusion, and residual thermal stress at the interface. Transient liquid phase bonding enables the realization of joints with high-melting-point compounds at low bonding temperatures, providing a promising solution for achieving "low-temperature bonding and high-temperature service." Owing to the low eutectic point of the solder and high melting points of compounds, we optimize the design of a germanium-telluride-based module at 533 K, which is successfully applied at the hot-side temperature of 773 K. Attributed to high-performance materials and reliable joints, the module realizes a high conversion efficiency of ∼15.1% and remains stable throughout 150 h of service. By adopting the same approach, the low- (Bi2Te3) and high-temperature (half-Heusler) modules are assembled. We provide a promising and general route for the assembly of full-temperature-range thermoelectric devices.

关键词： transient liquid phase bonding thermoelectric module intermetallic compounds GeTe

Carbon Fiber Composite Honeycomb Structures and the Application for Satellite Antenna Reflector with High Precision

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Advances in Astronautics science and technology 2022年第4期5卷 423-441页

作者： Wei, Xingyu Wang, Yan Xue, Pengcheng Zhang, Taotao Rouis, Abir Xiao, Wei Xiong, Jian Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150001 China National Key Laboratory of Science and Technology On Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 China Beijing Institute of Spacecraft System Engineering Beijing 10000 China

This article summarizes the composite honeycomb structure which possess important meaning and application value on the high-precision satellite antenna reflector. The key technologies of composite material honeycomb structure are summarized, including the material selection for satellite antenna reflector, honeycomb configuration, fabrication process, mechanical properties, lightweight design, surface accuracy, thermal deformation control and other issues. The development goal of “lighter, larger, more refined and more stable” are put forward after looking forward to the manufacturing technology and functional requirement of the future satellite antenna reflector. © 2022, Chinese Society of Astronautics.

关键词： Composite honeycomb material Fabrication method Mechanical property Sandwich structure Satellite antenna reflector

Ablation-Cooling Effect During Nanosecond Laser Precision Machining of Cfrp

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SSRN 2024年

作者： Chen, Guanglei Ye, Yunxia Hong, Ziqin Yuan, Zhao Ren, Xudong Shi, Liping School of Mechanical Engineering Jiangsu University Zhenjiang212013 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150006 China

Heat-affected zone (HAZ) in laser machining of carbon fiber reinforced plastic (CFRP) is an important factor affecting the assembly and service performance of CFRP. The ablation-cooling effect induced by nanosecond laser can be used to control HAZ of CFRP and improve the machining efficiency simultaneously. In this paper, the influence of key parameters such as peak power density, pulse width and repetition frequency on the formation mechanism of HAZ and the conditions for ablation-cooling are studied based on simulation and experiment. The simulation results show that ablation-cooling is more likely to occur at the high peak power density and high repetition frequency. The pulse width affects the width of HAZ through the ablation mechanism. The experimental results show that when the peak power density is greater than 108 W/cm2, the ablation-cooling effect effectively reduces HAZ and increases the removal amount, which is consistent with the simulation law. © 2024, The Authors. All rights reserved.

关键词： Carbon fiber reinforced plastics

Inversion of Spatially Distributed Elastic Moduli of 2.5d Woven composites Based on Dic Strain Field Using Pinn Method

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SSRN 2024年

作者： Wang, Hongyue Fang, Guodong Gao, Bo Wang, Bing Meng, Songhe Center for Composite Materials and Structures Harbin Institute of Technology Harbin150001 China Science and Technology on Advanced Composites in Special Environments Key Laboratory Harbin Institute of Technology Harbin150001 China

Due to the stochastic geometries from micro-scale to meso-scale, the elastic modulus of fiber reinforced ceramic matrix woven composites exhibits significant spatial variabilities, as evidenced by the surface strain distribution captured through Digital Image Correlation method. These spatial variabilities, resulting in significant heterogeneous material properties, are of essential importance in both engineering and material science. Inspired by the excellent performances of Physics-Informed Neural Networks (PINNs), a data-driven method integrating invariant-based theory based on iteration strategy is proposed to identify the non-homogeneous modulus field of 2.5D SiO2f/SiO2 composites inversely. The constitutive equation has been normalized by the Tsai’s modulus, effectively alleviating the ill-posed nature of the problem. Furthermore, the results of PINNs show a high prediction accuracy, which have been validated through virtual testing and experimental tensile tests. The method proposed in this paper provides a powerful approach for inversely identifying the spatial variabilities of orthotropic composite material properties, which also holds potential for applications such as high-throughput non-destructive evaluation techniques. © 2024, The Authors. All rights reserved.

关键词： Elastic moduli