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High temperature mechanical and fatigue properties of sol-derived C/Mullite composites

Ceramics International 2025年第16期51卷 21776-21787页

作者： Zhang, Wei Hong, Sen Ma, Qingsong Zeng, Kuanhong Mao, Weiguo College of Materials Science and Engineering Changsha University of Science & Technology Changsha410114 China Science and Technology on Advanced Ceramic Fibers &Composites Laboratory 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 Harbin150001 China

To reveal the in-situ mechanical properties evolution and failure behavior of C/Mullite composites at high temperature, the in-situ mechanical and fatigue properties of the composites at high temperature were systematically studied in present study. The results suggested that C/Mullite composites presented admirable high temperature mechanical properties in air. The flexural strength of the composites at 1200 °C∼1400 °C was higher than that at room temperature. The composites showed retention of ∼120 % in flexural strength at 1400 °C. The enhanced flexural strength was ascribed to the released thermal stress. The composites showed the fracture toughness of ∼13.5 MPa m1/2 at 1200 °C. Although the fracture toughness of the composites decreased to about 5.6 MPa m1/2 at 1500 °C due to oxidation, the composites exhibited strength retention of ∼94 % at this moment. Furthermore, C/Mullite composites exhibited excellent fatigue performance at 1200 °C in vacuum. The composites was survived after 105 cycles of fatigue loading when the stress level did not exceed 75 %, and there was no decline in in-situ mechanical properties of the composites after 105 cycles of fatigue loading under the stress level of 70 %. The present study further verified the application potential of C/Mullite composites as thermal protection materials. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Thermal fatigue

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Machine learning-driven insights into biaxial strain-induced anomalous thermal conductivity enhancement of boron arsenide

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science China(Technological sciences) 2025年第5期68卷 1-14页

作者： Yikun LIU Yurong HE Tianqi TANG Jiaqi ZHU School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhou 450000China Heilongjiang Key Laboratory of New Energy Storage Materials and Processes Harbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin 150080China

Boron arsenide(BAs)is a promising integrated circuit thermal management material with ultra-high thermal conductivity(κ)and exceptional semiconductor *** practical devices,mechanical stress and strain caused by thermal expansion inevitably affect the thermodynamic properties of heat sink ***,investigation of the effects of stress and strain on theκof BAs is *** assessment and regulation of theκand phonon heat transport of BAs requires consideration of both three-phonon(3ph)and four-phonon(4ph)***,anharmonicity computation using density functional theory is computationally expensive,particularly for the fourth-order interatomic force *** work uses a machine learning-driven moment tensor potential method to evaluate higher-order anharmonicity and extends it to include fourth-order forces,accelerating the calculations *** show that theκof BAs calculated using the moment tensor potential method when considering both 3ph and 4ph processes agrees well with experimental *** contrast,considering the 3ph interaction alone causesκto be *** machine learning approach reduces computational costs by approximately 94%while maintaining comparable accuracy to density functional *** solving the phonon Boltzmann transport equation,the thermal transport properties of BAs under biaxial tensile strains ranging up to 7%are *** shows an anomalousκenhancement when including both 3ph and 4ph interactions,with a maximum enhancement of 15%at a small strain of 1%,primarily because of the weakening of the 3ph *** 2%strain,both the 3ph and 4ph scattering rates increase significantly,causing shorter phonon lifetimes and a monotonic reduction inκ.Additionally,theκtemperature dependence under strain is explored,highlighting temperature’s role in modulating phonon *** study provides machine learning-driven insights into the BAs thermal response under bi

关键词： boron arsenide machine learning potential biaxial strain thermal conductivity enhancement phonon transport

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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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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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High mass-loading and binder-free flexible vanadium-based oxide cathode for zinc-ion battery via a bridge of MXene

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Journal of Materials science & technology 2023年第12期143卷 84-92页

作者： Kan Fang Fei Li Gui-Gen Wang Yi-Lin Liu Man-Lin Tan Da-Qiang Zhao Hua-Yu Zhang Jie-Cai Han Shenzhen Key Laboratory for Advanced Materials School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Research Institute of Tsinghua University in Shenzhen Shenzhen 518055China

Flexible zinc-ion batteries(ZIBs)are promising power sources for portable devices due to their high safety and low production ***,the low mass-loading and limited areal capacity of cathode materials are the major problems blocking the practicability of ***,a high mass-loading and binder-free flexible vanadium oxide(MCV@CC)cathode with a large areal capacity was fabricated via the bridge effect of *** functional MXene bridge induces the growth of the vanadium oxide active layer on the carbon cloth(CC)flexible *** binder-free cathode can reduce the electrochemically inactive weight of the whole electrode,which enhances the energy density of ***,the MCV@CC cathode(mass-loading of∼7 mg cm^(−2))delivers a desirable areal capacity(2.36 mAh cm^(−2))and good cycling stability(capacity retention of 86.1%after 1200 cycles at 10 mA cm^(−2)).Moreover,several ex-situ characterization results indicate that the reaction mechanism upon battery cycling is based on the reversible Zn^(2+)/H^(+)(de)intercalation in the vanadium oxide ***,the assembled quasi-solid-state MCV@CC//Zn flexible battery exhibits decent performance at different bending *** a bridge effect strategy sheds light on the construction of high mass-loading flexible electrodes for ZIBs applications.

关键词： Zinc-ion batteries Vanadium oxide MXene bridge High mass-loading Flexible electrode

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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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Ultra-sensitive,highly linear,and hysteresis-free strain sensors enabled by gradient stiffness sliding strategy

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npj Flexible Electronics 2024年第1期8卷 817-824页

作者： Fuhua Xue Qingyu Peng Renjie Ding Pengyang Li Xu Zhao Haowen Zheng Liangliang Xu Zhigong Tang Xinxing Zhang Xiaodong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of Technology150080 HarbinChina State Key Laboratory of Polymer Materials Engineering Polymer Research InstituteSichuan University610065 ChengduChina

Developing strain sensors with both high sensitivity and high linearity has always been the goal of *** to resistive strain sensors,capacitive strain sensors have incomparable linearity advantages,but have always been limited by low ***,we report a gradient stiffness sliding design strategy that addresses this problem,significantly improving sensitivity while maintaining high *** controlling the distribution of the locally enhanced electric field and the heterogeneous deformation of the substrate,a strain sensor with excellent performance is successfully prepared,exhibiting a giant gauge factor(9.1×10^(6))and linearity(R^(2)=0.9997)over the entire sensing range,together with almost no hysteresis and fast response time(17 ms).The gradient stiffness sliding design is a general strategy expected to be applied to other types of sensors to achieve ultra-high sensitivity and ultra-high linearity at the same time.

关键词： stiffness strain gradient

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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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