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Synergistic regulation of temperature resistance and thermal insulation performance of zirconia-based ceramic fibers

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Rare Metals 2023年第12期42卷 4189-4200页

作者： Yong-Shuai Xie Ying Peng Zhe-Zhe Deng Ze Zhu Yuan Cheng De-Hua Ma Lu-Yi Zhu Xing-Hong Zhang State Key Laboratory of Crystal Materials School of Crystal MaterialsShandong UniversityJinan 250100China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China

ZrO_(2) fiber is a promising high-temperature resistant and heat-insulating fiber ***,the decrease in mechanical properties caused by grain growth at high temperatures seriously affects its *** to achieve the synergy of its temperature resistance and the thermal insulation performance is still the focus of the current *** this work,we started with doping inequivalent elements and studied the phase composition,temperature resistance,and thermal insulation properties of Y_(2)O_(3)-ZrO_(2) ceramic fibers by adjusting the Y/Zr molar *** results showed that Y_(2)O_(3) could enter the crystal lattice of ZrO_(2) and form a solid *** the increase in Y_(2)O_(3) content,the structure of fibers changed from a tetragonal phase to a cubic phase,and the configurational entropy of the system *** larger configuration entropy in the sample could produce a robust steric hindrance effect,inhibiting grain *** heat treatment at 1300℃,the grain size of Y_(2)Zr_(2)O_(7)(Y5Z5)fibers was only 61.8%that of Y_(0.1)Zr_(0.9)O_(1.95)(Y1Z9)*** smaller grain size made the Y5Z5 fibers still have excellent flexibility and deformation recovery performance after heat treatment at 1300℃and could still return to the original state after 85%compression or folded in *** addition,due to the larger configurational entropy,the mean free path of phonon scattering was shortened,thereby improving the thermal insulation performance of the *** short,this work achieves the synergistic effect of temperature resistance and thermal insulation properties of zirconia-based fiber materials only through simple inequivalent element doping.

关键词： Ceramics fiber ZrO_(2) Y_(2)O_(3) Thermal insulation Temperature resistance

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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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Nanodiamond reinforced self-healing and transparent poly(urethane-urea)protective coating for scratch resistance

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International Journal of Smart and Nano Materials 2024年第1期15卷 75-94页

作者： Zhuochao Wang Wenxin Cao Chunqiang Sun Dongchao Ji Kunlong Zhao Gang Gao Xingchun Xu Yingqi Liu Tianyu Zhang Jiaqi Zhu Jiecai Han National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina School of future technology Harbin institute of TechnologyHarbinChina Key Laboratory of Micro-systems and Micro-structures Manufacturing Ministry of EducationHarbinChina

With increasing demand for scratch-resistant flexible electro-nics,the development of transparent coatings with good scratch resistance and self-healing properties has emerged as a key research *** this study,a high-strength self-healing poly(urethane-urea)(PUU)-based nanocomposite coating was prepared by introducing functionalized nanodiamond(ND)into a PUU matrix via solution *** PUU matrix had hard-segment repeating units and was constructed using iso-phorone diamine and isophorone *** ND particles were modifed using a silane coupling agent,3-aminopropyl-triethoxysilane,to obtain well-dispersed KH-ND ***-ND promoted microphase separation in the PU matrix,inducing the formation of dense and homogeneous hard domains that dissipated stress,prevented further crack devel-opment,and improved the mechanical properties and scratch resistance of the *** addition,the coating exhibited excellent self-healing ***-transform infrared spectroscopy,scanning electron microscopy,and atomic force microscopy were used to characterize the self-healing and hardening mechanisms of the *** environmentally friendly PUU/KH-ND coating is easy to prepare and has broad application prospects in transparent and anti-scratch coatings for flexible electronics,automobiles,and home appliances.

关键词： Nanocomposite coatings self-healing scratch resistance transparent poly(urethane-urea)

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Spinodal dynamics of metastable glass transition domains in amorphous polymer towards thermomechanically tailorable shape memory effect

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science China(Technological sciences) 2023年第8期66卷 2432-2440页

作者： LIU JingYun LU HaiBao FU Yong-Qing Science and Technology on Advanced Composites in Special Environments Laboratory Harbin Institute of TechnologyHarbin 150080China Faculty of Engineering and Environment Northumbria UniversityNewcastle upon TyneNE18STUK

Glass transition plays a critical role to determine the dynamic behaviors of amorphous shape memory polymers(SMPs).However,the fundamental relationships between shape memory effect(SME)and dynamic glass transition have not been well understood,even though this topic has been studied for *** this study,we apply a mean-square displacement function of Adam-Gibbs(AG)domain size model to explore metastable glass transition between normal glass state and rubbery state of amorphous SMPs,based on both mode-coupling theory and mean-field model.A statistic viscosity equation is formulated to study the dynamic glass transition of metastable AG domains in an amorphous SMP.A dynamically spinodal model is also developed to connect dynamic glass transitions to thermomechanical processes,based on statistic viscosity equation and phase transition ***,using the spinodal models,multiple shape memory behaviors have been predicted for amorphous SMPs with dual-,triple-and quadruple-SMEs,resulted from their different routes of themomechanical ***,the proposed models are verified using the experimental data reported in literature.

关键词： shape memory polymer glass transition dynamics metastable

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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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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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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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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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Medium and high-entropy transition mental disilicides with improved infrared emissivity for thermal protection applications

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Journal of Materials science & technology 2023年第5期136卷 149-158页

作者： Juntao Song Yuan Cheng Huimin Xiang Fu-Zhi Dai Shun Dong Guiqing Chen Ping Hu Xinghong Zhang Wenbo Han Yanchun Zhou Science and Technology on Advanced Composite in Special Environments Laboratory Harbin Institute of TechnologyHarbin 150080China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China

Transition metal disilicides are widely used as heating elements and infrared emission ***,the limited intrinsic infrared emissivity and high thermal conductivity are the main limitations to their applications as infrared emission coatings in the thermal protection *** cope with these prob-lems,four medium and high-entropy transition metal disilicides,i.e.,(V_(0.25)Ta_(0.25)Mo_(0.25)W_(0.25))Si_(2)(ME-1),(Nb_(0.25)Ta_(0.25)Mo_(0.25)W_(0.25))Si_(2)(ME-2),(V_(0.2)Nb_(0.2)Ta_(0.2)Mo_(0.2)W_(0.2))Si_(2)(HE-1),and(Cr_(0.2)Nb_(0.2)Ta_(0.2)Mo_(0.2)W_(0.2))Si_(2)(HE-2),were designed and synthesized by spark plasma sintering method using transition metal binary disilicides as *** introduction of multi-elements into transition metal disilicides not only im-proved the infrared emissivity but also reduced the electrical and thermal *** them,(Cr_(0.2)Nb_(0.2)Ta_(0.2)Mo_(0.2)W_(0.2))Si_(2)(HE-2)had the lowest electrical conductivity of 3789 S cm-1,which is over one order of magnitude lower than that of MoSi_(2)(50000 S cm^(-1)),and total infrared emissivity of 0.42 at room temperature,which is nearly double of that of TaSi_(2).Benefiting from low electrical conductivity and phonon scattering due to lattice distortion,the medium and high-entropy transition metal disilicides also demonstrated a significant decline in thermal conductivity compared to their binary *** all samples,HE-2 exhibited the lowest thermal conductivity of 6.4 W m^(−1)K^(−1).The high-entropy tran-sition metal disilicides also present excellent oxidation resistance at high *** improved infrared emissivity,reduced thermal conductivity,excellent oxidation resistance,and lower densities of these medium and high-entropy transition metal disilicides portend that they are promising as infrared emission coating materials for applications in thermal protection systems.

关键词： High-entropy ceramics Transition metal disilicides Electrical conductivity Infrared emissivity Thermal conductivity

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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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