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Density-functional-theory predictions of mechanical behaviour and thermal properties as well as experimental hardness of the Ga-bilayer Mo_(2)Ga_(2)C

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Journal of advanced Ceramics 2022年第2期11卷 273-282页

作者： Xinxin QI Weilong YIN Sen JIN Aiguo ZHOU Xiaodong HE Guangping SONG Yongting ZHENG Yuelei BAI National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structures Harbin Institute of TechnologyHarbin 150080China School of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo 454003China

Mo_(2)Ga_(2)C is a new MAX phase with a stacking Ga-bilayer as well as possible unusual *** understand this unique MAX phase structure and promote possible future applications,the structure,chemical bonding,and mechanical and thermodynamic properties of Mo_(2)Ga_(2)C were investigated by *** the“bond stiffness”model,the strongest covalent bonding(1162 GPa)was formed between Mo and C atoms in Mo_(2)Ga_(2)C,while the weakest Ga–Ga(389 GPa)bonding was formed between two Ga-atomic layers,different from other typical MAX *** ratio of the bond stiffness of the weakest bond to the strongest bond(0.33)was lower than 1/2,indicating the high damage tolerance and fracture toughness of Mo_(2)Ga_(2)C,which was confirmed by indentation without any *** high-temperature heat capacity and thermal expansion of Mo_(2)Ga_(2)C were calculated in the framework of quasi-harmonic approximation from 0 to 1300 *** of the metal-like electronic structure,the electronic excitation contribution became more significant with increasing temperature above 300 K.

关键词： MAX phase first-principles damage tolerance heat capacity thermal expansion

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Flexible inorganic piezoelectric functional films and their applications

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Journal of advanced Ceramics 2023年第3期12卷 433-462页

作者： Liyun Zhen Lijun Lu Yongtao Yao Jingquan Liu Bin Yang National Key Laboratory of Science and Technology on Micro/Nano Fabrication Shanghai Jiao Tong UniversityShanghai 200240China Department of Micro/Nano Electronics School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China

Piezoelectric materials play an increasingly important role in energy harvesters,sensors,and *** and thin piezoelectric films have been demonstrated to provide advanced functionalities and improved ***,the research on flexible inorganic piezoelectric thin films has rarely been systematically ***,we summarize the recent advances in the flexible inorganic piezoelectric thin films,focusing on their structural designs,fabrication techniques,and applications in various practical ***,different fabrication techniques suitable for diverse inorganic piezoelectric nanostructures are reviewed,including sol-gel,hydrothermal,electrospinning,and other techniques,and the integration process with flexible substrates is further *** and industrial applications of the flexible piezoelectric thin films are ***,some existing challenges and future perspectives are discussed.

关键词： inorganic piezoelectric thin films fabrication techniques structural design flexible electronics

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Fabrication of multi-anionic high-entropy carbonitride ultra-high-temperature ceramics by a green and low-cost process with excellent mechanical properties

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Journal of advanced Ceramics 2023年第6期12卷 1258-1272页

作者： Liansen Xia Shun Dong Jianqiang Xin Kaixuan Gui Peitao Hu Yongshuai Xie Dongdong Yang Xinghong Zhang Yanchun Zhou National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China Institute for Aero Engine Tsinghua UniversityBejing 100084China School of Materials Science and Engineering Anhui Polytechnic UniversityWuhu 241000China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

As a new category of ultra-high-temperature ceramics(UHTCs),multi-anionic high-entropy(HE)carbonitride UHTCs are expected to have better comprehensive performance than conventional ***,how to realize the green and low-cost synthesis of high-quality multi-anionic HE carbonitride UHTC powders and prepare bulk ceramics with excellent mechanical properties still faces great *** this work,a green,low-cost,and controllable preparation process of(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C,N_(1-x) powders is achieved by sol-gel combined with the carbothermal reduction/nitridation method for the first *** as-synthesized(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C_(x)N_(1-x) powders possess high compositional uniformity and controllable particle *** addition,the obtained bulk ceramics prepared at 1800℃exhibit superior fracture toughness(Kic)of 5.39±0.16 MPa·m^(1/2) and high nanohardnesof 35.75±1.23 GPa,lastic modulus(E)of 566.70±8.68 GPa,and flexural strength of 487±41 *** study provides a feasible strategy for preparing the high-performance HE carbonitride ceramics in a more environmentally friendly and economical manner.

关键词： high-entropy(HE)carbonitride ceramics multi-anionic structure sol-gel green synthesis mechanical properties

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Regulating the formation ability and mechanical properties of high-entropy transition metal carbides by carbon stoichiometry

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Journal of Materials science & technology 2022年第26期121卷 181-189页

作者： Juntao Song Guiqing Chen Huimin Xiang Fuzhi Dai Shun Dong Wenbo Han Xinghong Zhang Yanchun Zhou Science and Technology on Advanced Composite in Special Environments Laboratory Harbin Institute of TechnologyHarbin150080China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing100076China

Tremendous efforts have been dedicated to promote the formation ability of high-entropy transition metal ***,the majority of methods for the synthesis of high-entropy transition metal carbides still face the challenges of high temperature,low efficiency,additional longtime post-treatment and uncontrollable *** cope with these challenges,high-entropy transition metal carbides with regulatable carbon stoichiometry(HE TMC)were designed and synthesized,achieving improved ability for single phase solid solutions formation,promoting of sintering and controllable mechanical *** typical composition series,i.e.,easily synthesized(ZrHfTaNb)C(ZHTNC)and difficultly synthesized(Zr_(0.25)Hf_(0.25)Ta_(0.25)Ti_(0.25))C(ZHTTC)are selected to demonstrate the promoting formation ability of single phase solid solutions from carbon stoichiometry *** phase high-entropy ZHTTC,which has been proven difficult in forming a single phase solid solution,can be prepared with the decrease of C/TM ratio under 2000℃;while the high-entropy ZHTNC,which has been proven easy in forming a single phase solid solution,can be synthesized at lower temperatures with the decrease of C/TM *** synergistic effect of entropy stabilization and reduced chemical bond strength gaining from carbon stoichiometry deviations is responsible for the formation of single phase solid solutions and the promoted sintering of HE *** example,the relative density of bulk(ZrHfTaNb)C(SPS-ZHTNC)increases from 90.98%to 94.25%with decreasing the C/TM atomic ratio from 0.9 to *** importantly,the room temperature flexural strength,fracture toughness and brittleness index of SPS-ZHTNCcan be tuned in the range of 384 MPa–419 MPa,4.41 MPam–4.73 MPamand 3.679μm–4.083μm,***,the HE TMCprepared by adjusting the ratio of carbon to refractory transition metal oxides have great potential for achieving low temperature synthesis,promoted sintering and tunable properties.

关键词： Carbon stoichiometry High-entropy ceramics Transition metal carbide Low temperature synthesis Tunable mechanical properties

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advanced liquid crystal-based switchable optical devices for light protection applications:principles and strategies

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Light(science & Applications) 2023年第4期12卷 512-541页

作者： Ruicong Zhang Zhibo Zhang Jiecai Han Lei Yang Jiajun li Zicheng Song Tianyu Wang Jiaqi Zhu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Research Center of Analysis and Measurement Harbin Institute of TechnologyHarbin 150080China School of Energy Science&Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Micro-systems and Micro-structures Manufacturing Ministry of EducationHarbin 150080China

With the development of optical technologies,transparent materials that provide protection from light have received considerable attention from *** important channels for external light,windows play a vital role in the regulation of light in buildings,vehicles,and *** is a need for windows with switchable optical properties to prevent or attenuate damage or interference to the human eye and light-sensitive instruments by inappropriate optical *** this context,liquid crystals(LCs),owing to their rich responsiveness and unique optical properties,have been considered among the best candidates for advanced light protection *** this review,we provide an overview of advances in research on LC-based methods for protection against ***,we introduce the characteristics of different light sources and their protection ***,we introduce several classes of light modulation principles based on liquid crystal materials and demonstrate the feasibility of using them for light *** addition,we discuss current light protection strategies based on liquid crystal materials for different ***,we discuss the problems and shortcomings of current *** propose several suggestions for the development of liquid crystal materials in the field of light protection.

关键词： optical crystal liquid

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Printable,flexible ceramic fiber paper based on electrospinning

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Rare Metals 2024年第6期43卷 2739-2746页

作者： Yong-Shuai Xie Yuan Cheng Yang Lyu Rui Li Jie-Cai Han National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China

Based on the fact that it is challenging for the polymer flexible circuit substrates to meet the requirements of serving in high-temperature environments,this work proposed the idea of using printable ceramic fiber paper as a high-temperature flexible circuit substrate.A ceramic fiber paper with all ceramic components had been developed via electrospinning,solving the problems of low strength and severe strength drop at high temperatures of traditional ceramic fiber *** tensile strength of the prepared ceramic fiber paper is 2.63 MPa,and the reliable service temperature is 1200℃.Its bulk density is about 1.5 times that of traditional ceramic fiber *** can be printed with patterns by commercial inkjet printers like ordinary printing paper and has excellent *** feasibility of ceramic fiber paper as a flexible circuit substrate was verified by constructing a simple *** the fiber paper is significantly bent,the circuit still forms a complete path,which proves that it has a strong application potential for high-temperature flexible circuit substrate and is expected to promote the development of flexible electronic devices serving at extreme high-temperature environments.

关键词： Ceramic fiber paper High temperature Inkjet printing Flexible electronic

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Viscoelastic negative stiffness metamaterial with multistage load bearing and programmable energy absorption ability

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International Journal of Smart and Nano Materials 2025年第1期16卷 1-23页

作者： Tianzhen Liu Cheng Lin Yonglin Zhang Jianguo Cai Jinglei Yang Key Laboratory of C&PC Structures of Ministry of Education National Prestress Engineering Research CenterSoutheast UniversityNanjingChina National key laboratory of science and technology on advanced composites in special environments Harbin Institute of TechnologyHarbinChina Department of Mechanical and Aerospace Engineering Hong Kong University of Science and TechnologyHong KongChina HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute ShenzhenChina

The mechanical properties of negative stiffness(NS)metamaterial could be customized and tuned in a wide range for various requirements,achieving programmable performances by the design from the aspect of structure and *** work investigates the viscoelastic NS metamaterial based on double curved beams using a combined approach of experiments,simulations,and analytical modeling with an emphasis on multistage loading bearing and programmable energy absorption *** simulations are first implemented based on the finite element models of three types of metamaterial cells,which provide comparisons of load bearing and energy absorption ***,the effects of geometric parameters of multistage metamaterial element and the mechanisms are *** analytical discrete model is then innovatively developed to provide straightforward understandings of the geometric effects and reveal the role of viscoelasticity by examining the instantaneous loading responses and rate-dependent ***,we fabricate the metamaterial samples using 3D-printing technique and perform compression tests to validate the properties based on different boundary conditions,loading rates and cyclic loading and *** of this work show the potential of wide programmable room for mechanical properties through structure and functional material design,such as multistage load bearing capacity and energy absorption ability.

关键词： Negative stiffness viscoelasticity discrete model energy absorption

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Optimal Design of Composite Structures for Unmanned Aerial Vehicles Based on Deep Learning 15

Optimal Design of Composite Structures for Unmanned Aerial V...

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15th Asia Conference on Mechanical and Aerospace Engineering, ACMAE 2024

作者： Xiang, Zijian Ma, Zhenyu Yang, Xixiang Deng, Xiaolong Lin, Guochang College of Aerospace Science and Engineering National University of Defense Technology Changsha410073 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

ISBN: (纸本)9781643685892

Composite materials are characterized by their lightweight and high-strength properties. Modern drone bodies predominantly utilize laminate structures made from composite materials. This article explores the application of deep learning methods in the design process of drone composite material structures, aiming to achieve weight reduction while maintaining structural strength and stiffness. To this end, we first conducted a study on the mechanical properties of composite laminates and employed a generative adversarial network (GAN) model to perform an inversion analysis of the single-layer parameters of the laminate. Subsequently, we executed a finite element simulation study of the UAV composite structure and applied the GAN model for inversion analysis. The laminate layering parameters were optimized and analyzed. The results indicate that the deep learning approach significantly enhances the accuracy of parameter inversion and the efficiency of layering design for composite laminate structures, demonstrating substantial application value for the optimal design of UAV composite material structures. © 2025 The Authors.

关键词： Laminated composites

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Element-based Peridynamics for Heat Conduction Problems of Isotropic and Anisotropic Materials With Crack Propagation

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Journal of Peridynamics and Nonlocal Modeling 2024年第4期6卷 725-772页

作者： Liu, Shuo Liang, Jun Fang, Guodong Institute of Advanced Structure Technology Beijing Institute of Technology Beijing 100081 China Science and Technology on Advanced Composites in Special Environment Key Laboratory Harbin Institute of Technology Harbin 150001 China

Element-based peridynamics (EBPD) for transient and steady heat conduction of isotropic and anisotropic materials is proposed, which can conveniently study the thermal transfer problems with cracks. The interactions of EBPD are described using 2-node rod elements for one-dimensional (1D) problems, 3-node triangle elements for two-dimensional (2D) problems and 4-node tetrahedron elements for three-dimensional (3D) problems. An additional rule constructing elements in the EBPD is added to reduce element numbers and delete the low mesh quality elements. The EBPD transient heat conduction equations are derived from the Lagrangian formalism, and the steady heat conduction equations are obtained by the variation principle. The treatments of surface effects, boundary conditions and crack descriptions are provided in detail. The forward difference time increment scheme and Gauss elimination method are used to solve transient and steady heat conduction problems respectively. A series of numerical examples, including 1D, 2D and 3D transient and steady heat conduction problems, are used to validate the proposed EBPD model. The temperature fields of the model with cracks are solved by the proposed method, which has the potential to study thermomechanical and thermal shock problems. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Element-based Heat conduction Nonlocal Peridynamics

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A surfactant-modified composite separator for high safe lithium ion battery

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Journal of Energy Chemistry 2023年第1期76卷 398-403,I0010页

作者： Botao Yuan Niandong He Yifang Liang Liwei Dong Jipeng Liu Jiecai Han Weidong He Yuanpeng Liu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080HeilongjiangChina MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150080HeilongjiangChina Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China

Separators have been gaining increasing attention to improve the performance of lithium ion batteries(LIBs),especially for high safe and long cycle ***,commercial polyolefin separators still face the problems of rapid capacity decay and safety issues due to the poor wettability with electrolytes and low thermal ***,a novel composite separator is proposed by introducing a surfactant of sodium dodecyl thiosulfate(SDS)into the polytetrafluoroethylene(PTFE)substrate with the binder of polyacrylic acid(PAA)through the suction filtration *** introduction of PAA/SDS enhances the adsorption energy between PTFE substrate and electrolyte through density functional theory calculations,which improves wettability and electrolyte uptake of the separator *** asachieved composite separator enables the LIBs to own high Li^(+)conductivity(0.64×10^(-3)S cm^(-1))and Li^(+)transference number(0.63),further leading to a high capacity retention of 93.50%after 500 cycles at 1 *** addition,the uniform and smooth surface morphology of Li metal employed the composite separator after cycling indicates that the lithium dendrites can be successfully *** work indicates a promising route for the preparation of a novel composite separator for high safe LIBs.

关键词： Composite separator PTFE Surfactant High safe Lithium ion batteries

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