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Efficient fabrication of light Cf/SiHfBOC composites with excellent thermal shock resistance and ultra-high-temperature ablation up to 1800℃

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Journal of advanced Ceramics 2023年第11期12卷 2062-2074页

作者： Yang Lyu Zhihong Han Guangdong Zhao Yuan Cheng Shanbao Zhou Xinghong Zhang Guiqing Chen Wenbo Han National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China School of Chemistry and Materials Science Heilongjiang UniversityHarbin 150080China

In this paper,a high-yield Hf-modified SiHfBOC ceramic precursor was developed,and a high-pressure assisted impregnation pyrolysis method was proposed to achieve the preparation of 3D PyC–Cf/SiHfBOC *** high-pressure assisted impregnation method significantly improves impregnation filling effect of the precursor in and between fiber bundles compared to dozens of traditional impregnation *** undergoing just 9 precursor infiltration pyrolysis(PIP)cycles,the composites achieved relative density of approximately 90%and density of 1.64 g/cm^(3).The critical temperature difference of the 3D PyC–Cf/SiHfBOC composites after the shock of room temperature(RT)–1000℃is as high as 650℃,which is twice that of traditional ceramic materials,showing good thermal shock *** the effect of Hf modification,a dense HfO_(2)–SiO_(2)oxide layer(thickness of 93μm)was formed in situ on the surface of the 3D PyC–Cf/SiHfBOC composites,effectively preventing further erosion of the composite matrix by high-temperature oxidation *** in the ultra-high-temperature oxygen-containing environment at 1800℃,it still exhibits an excellent non-ablative result(with a linear ablation rate of 0.83×10^(−4)mm/s).This work not only enriches the basic research on lightweight ultra-high-temperature ceramic composites converted from Hf ceramic precursors,but also provides strong technical support for their applications in ultra-high-temperature non-ablative thermal protection materials for high-speed aircraft.

关键词： 3D PyC-C/SiHfBOC composites precursor infiltration pyrolysis(PIP)method thermal shock resistance ablation resistance ablation mechanism

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MWCNT Doped Reverse-Mode Polymer Network Liquid Crystals with Frequency Response Property

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Chinese Physics Letters 2024年第3期41卷 161-170页

作者：李佳峻姬栋超张智博杨亚楠张锐聪王天宇张宇民曹文鑫朱嘉琦 National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhou 450000China School of Energy Science&Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials and Key Laboratory of Cluster Science of Ministry of Education School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China

Polymer-liquid crystals(PLCs)are common materials for smart ***,PLC smart windows usually require high driving voltage to maintain *** synthesized a novel PLC smart film by doping multi-wall carbon nanotubes(MWCNTs)in... 详细信息

关键词： smart transparency maintain

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Fabrication of electrical semi-conductive SiCN ceramics by vat photopolymerization

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Journal of Materials science & technology 2023年第34期165卷 123-131页

作者： Siyao Chen Xue Wan Jinping Li Bo Gao Xuliang Chen Songhe Meng Jian Lu National key laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Department of Mechanical Engineering City University of Hong KongHong KongSARChina

The emergence of additive manufacturing(AM)enables ceramics to be fabricated with customized geometry,and polymer-derived ceramics(PDCs)has attracted growing attention owing to their irreplaceable *** combination of 3D printing and PDCs endows the resultant ceramics with both precision and ***,AM of ceramics from preceramic polymers is still challenging,and insufficient investigation of functionality also limits the versatility of precursor and its derived ***,we propose a novel paradigm for 3D printing dense silicon carbonitride ceramic and study its electrical semiconducting *** formulated photosensitive precursor inks could achieve self-polymerization and cross-linking under the radiation of UV light(405 nm).The green body with intricate structures is fabricated by digital light processing(DLP).Lightweight(1.79-2.08 g cm^(-3))and low porosity(<5%)amorphous ceramics were obtained after thermal *** of cross-linking,decomposition,and ceramization are monitored and ***,the semi-conducting behaviors of resultant ceramics are identified where the conductivity(10^(-5)-10^(-1)S m^(-1))has a monotonic correspondence with the testing temperatures(25-1000℃).The numerical relationship is fitted by exponential functions,and its conducting mechanism could be interpreted by the band tail hopping(BTH)*** work could provide alternative solutions for the fabrication of PDCs and potentials for sensing applications.

关键词： Additive manufacturing Polymer-derived ceramics Digital light processing Silicon carbonitride Semi-conducting behavior

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Grain growth kinetics and densification mechanism of(TiZrHfVNbTa)C high-entropy ceramic under pressureless sintering

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Journal of Materials science & technology 2022年第15期110卷 57-64页

作者： Wen Zhang Lei Chen Chenguang Xu Xuming Lv Yujin Wang Jiahu Ouyang Yu Zhou School of Materials Science and Engineering Institute for Advanced CeramicsHarbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Harbin Institute of TechnologyHarbin 150001China Science and Technology on Particle Transport and Separation Laboratory Tianjin 300180China

The grain growth kinetics and densification mechanism of(TiZrHfVNbTa)C high-entropy carbide ceramic are investigated in this work.A single phase carbide with a rock-salt structure is formed until 2300°C,below which an apparent aggregation of V,Zr and Hf *** is associated with the slow diffusion rate of V element as well as the relatively poor solubility of VC in HfC(as well as ZrC).The grain growth mechanism gradually changes from surface diffusion to volume diffusion and then grain boundary diffusion with increasing sintering *** is attributed to the variation of activation energy of grain *** densification mechanism is principally dominated by the mass transport through lattice diffusion with the activation energy of 839±53 k J/*** the design of two-step sintering,it is verified that the solid solution formation can effectively promote the densification process.

关键词： High-entropy carbide ceramic Pressureless sintering Grain growth kinetics Densification mechanism

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Mechanical and shape-memory properties of TPMS with hybrid configurations and materials

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International Journal of Smart and Nano Materials 2024年第4期15卷 786-810页

作者： Tianzhen Liu Wei Zhao Yongtao Yao Cheng Lin Hanxing Zhao Jianguo Cai Key Laboratory of C&PC Structures of Ministry of Education National Prestress Engineering Research CenterSoutheast UniversityNanjingChina Department of Astronautical Science and Mechanics Harbin Institute of TechnologyHarbinChina National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina

Triply periodic minimal surface(TPMS)structures with excellent properties of stable energy absorption,light weight,and high specific strength could potentially spark immense interest for novel and programmable functions by combining smart materials,*** memory polymers(SMPs).This work proposes TPMS lattices with hybrid configurations and materials that are composed of viscoelastic and shape-memory materials with the aim to bring temperature-dependent mechanical properties and additional dissipation *** configurations and diverse materials of polylactic acid(PLA),fiber-reinforced PLA,and polydimethylsiloxane(PDMS)are induced,generating five types of TPMS lattices,including(Schoen’s I-WP)IWP uniform lattice,IWP lattice with density gradient,hybrid configurations,hybrid materials,and filled PDMS,which are fabricated by 3D *** fracture morphologies and the distribution of carbon fibers are demonstrated via scanning electron microscopy with a focus on the influence of carbon fiber on shape-memory and mechanical *** recovery tests are conducted,which proves good shape memory properties and reusable capability of TPMS *** combined methods of experiments and numerical simulation are adopted to evaluate mechanical properties,which presents multi-stage energy absorption ability and tunable vibration isolation performances associated with temperature and hybridization *** work can promote extensive research and provide substantial opportunities for TPMS lattices in the development of functional applications.

关键词： Triply periodic minimal surface shape memory property hybridization multi-stage energy absorption

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Recent advances in MXene for terahertz applications

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Optoelectronics Letters 2024年第5期20卷 272-288页

作者： ZHANG Yongzhi JIANG Jiuxing YAO Yongtao HE Xunjun Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080China College of Science Harbin University of Science and TechnologyHarbin 150080China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin University of Science and TechnologyHarbin 150080China

Since first synthesized in 2011, MXenes have attracted extensive attention in many scientific fields as a new two-dimensional(2D) material because of the unique physical and chemical properties. Over the past decade, in particular, MXenes have obtained numerous exciting achievements in the field of terahertz applications. In this review, we first briefly introduce the MXene materials, such as the basic structure and main fabrication processes of MXenes. Then, we summarize the recent applications of MXene materials in various terahertz research areas, including terahertz modulation, terahertz absorption, terahertz shielding, terahertz communication, terahertz detection and terahertz generation, in which the representative results are presented. Finally, we give an outlook on the future research directions of MXene materials and their potential applications.

关键词： terahertz directions absorption

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An Approach to Optimize the Mechanical Properties of Cylindrical Negative Stiffness Structures

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ce/papers 2025年第2期8卷 1078-1086页

作者： Liu, Xin Tan, Xiaojun Wang, Bing National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China School of Civil Aviation Northwestern Polytechnical University Xi'an710072 China

Negative stiffness (NS) structure, as a type of mechanical metamaterial, possess numerous excellent properties and has broad potential applications in areas such as impact energy absorption, vibration damping, and noise reduction. However, their energy absorption efficiency is not high. Typically, incorporating fillers into honeycomb structures proves to be an effective strategy for augmenting the mechanical properties of honeycomb materials. In this study, we propose a model for a filled cylindrical NS structure (CNS), where the fillers are treated as springs to facilitate finite element simulation. Subsequently, we further investigate the fundamental mechanical properties and energy dissipation capacity of unfilled CNS structures as well as filled CNS structures employing distinct types of fillers, including linear elastic and viscoelastic fillers. The results indicate that linear elastic fillers do not have a positive impact on improving the energy dissipation capacity of CNS structures but can be used to adjust the response curve. When viscoelastic fillers are filled inside the CNS structure, they can effectively enhance the strength and energy dissipation capacity of the CNS structure. Moreover, the approach presented in this investigation holds significant reference value for the design of various mechanical metamaterials based on NS structures. © 2025 Ernst & Sohn GmbH.

关键词： Honeycomb structures

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Thermal response, oxidation and ablation of ultra–high temperature ceramics, C/SiC, C/C, graphite and graphite–ceramics

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Journal of Materials science & technology 2022年第7期102卷 137-158页

作者： Xinghong Zhang Baihe Du Ping Hu Yuan Cheng Jiecai Han National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150001China

Various thermal protection materials exhibit obviously different and complicated thermal response,oxidation and ablation behavior,which are very important for the appropriate design and ***,the relative researches are very few *** this work,the thermal response,oxidation and ablation behavior of representative thermal protection materials including ultra-high temperature ceramics,C/SiC,C/C, graphite and graphite-ceramic were investigated systematically in strong heat flux,high enthalpy and low-pressure *** response of these materials was analyzed based on experimental results and thermal energy balance that accounts for all of the heat transfer processes transporting energy into and out of the *** factors were playing important roles in the thermal response including thermal conductivity,volumetric heat capacity,catalytic efficiency,emissivity and oxidation characteristics of the *** importance of each factor not only depends on the material characteristics such as material composition and phase content but also environment parameters including heat flux,enthalpy,pressure and testing *** comparisons and relationships of oxidation and ablation behaviors for these materials under extreme environments were also illustrated in ***,thermal response and ablation behaviors of pre-oxidized material or repeated tests were also performed to evaluate the effect of pre-treatment on the performance and reusability of thermal protection *** work offers guiding significance for the appropriate design and selection of thermal protection materials.

关键词： Thermal protection materials Ceramic Thermal response Oxidation Ablation

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Dried bonito flakes-inspired moisture-responsive actuator with a gradient structure for smart devices

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Journal of Materials science & technology 2023年第36期167卷 152-160页

作者： Zhong Chen Qingyu Peng Ying Hu Zonglin Liu Xu Zhao Pengyang Li Liangliang Xu Haowen Zheng Fuhua Xue Renjie Ding Xiaodong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China Institute of Industry&Equipment Technology Hefei University of TechnologyHefei 230009China

Exploring high-performance soft actuators from biomass resources is significant for developing eco-friendly smart *** bonito(DB)flake is a common food as well as a biomass material,and it can produce irregular motion in changed moisture,just like *** by this intriguing phenomenon,a cost-effective,biocom patible,and biodegradable moisture-responsive DB film actuator with a gradient structure is *** DB film actuator exhibits rapid and reversible bending deformation triggered by a humidity gradient with a high bending speed(40°s-1)and a maximum bending angle(180°).More-over,the DB film actuator shows large bending deformation(-71°to+51°)with a high actuation force(214.7 Pa)in response to changes in relative ***,the actuation performance can be also tuned by adjusting the thickness of the *** applications of this actuator,including smart grippers,crawling robots,and biomimetic flowers for visible humidity sensing,are *** importantly,smart sweat-responsive wearables that automatically deform to promote sweat evaporation and convection during exercise are constructed based on the actuator,making it promising for adaptive personal thermal *** work offers an easily processable,cost-effective,and environmentally benign strategy to construct moisture-responsive actuators for future eco-friendly smart devices.

关键词： Moisture-responsive Dried bonito flakes Actuators Smart wearables Soft robots

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Mn-N-P doped carbon spheres as an efficient oxygen reduction catalyst for high performance Zn-Air batteries

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Chinese Chemical Letters 2023年第1期34卷 177-181页

作者： Jiajie Li Shanbao Zou Jinzhen Huang Xiaoqian Wu Yue Lu Xundao Liu Bo Song Dehua Dong School of Materials Science and Engineering University of JinanJi nan 250022China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China

Low-cost and efficient oxygen reduction reaction(ORR)electrocatalysts are the key to developing Zn-air batteries for renewable energy ***,the Mn-N-P doped carbon sphere was prepared through polymerization of hexachlorotripolyphosphazene(HCCP)and phloroglucinol,and then followed the calcination at 900°*** calculations demonstrated the introduction of Mn in N-P doped carbon could lower the dissociation barrier of O2into O*and promote the ORR through a *** asprepared catalysts exhibited a half-wave potential of 0.82 V *** and limiting current density of 5.2 m A/cm^(2)toward ORR,which was comparable to those of the commercial Pt/C *** addition,Zn-air batteries with 0.05 Mn-N-P-C catalysts showed a high specific capacity of 830 m Ah/gZnand excellent cycle *** facile approach demonstrated herein could be a solution to develop optimum non-precious metal catalysts for the application in cathodes of proton exchange membrane fuel *** study also provides new insight to design the catalysts of multi-heteroatom coordinated metal in the carbon matrix for both fundamental researches and practical applications.

关键词： Oxygen reduction reaction Zn-air batteries Transition metal Doped carbon spheres

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