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Research on shear ablation and thermal insulation performance of the C f /SiBCN polymer-amorphous ceramic gradient thermal protection composites

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Journal of Alloys and Compounds 2025年 1036卷

作者： Chunlei Xia Weihua Xie Songhe Meng Fajun Yi Bo Gao Fan Yang Yu Dong National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 PR China School of Mechatronics Engineering Harbin Institute of Technology Harbin 150080 PR China

The development of future hypersonic aircraft poses practical challenges to the innovation of thermal protection materials. Herein, we prepared a novel integrated C f /SiBCN polymer - amorphous ceramic gradient thermal protection composite. We analyzed shear ablation tests with ablation angles of 30°, 45°, 60°, 75°, and 90°. The material surface had no obvious ablation cracks or holes, and the mass ablation rate and linear ablation rate were very slight after continuous ablation for more than 150 s. Although the ablation surface temperature of the material reached 2100 ℃, the back temperature was much lower than 70 ℃ within 100 s. This material exhibited excellent resistance to shear ablation, ablation deformation, thermal insulation, and ablation delamination. Meanwhile, shear ablation tests have built a bridge from material development to practical application. The material has the potential for practical applications in the aerospace field.

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New Equations for Describing Contact Area between Tire and Ground

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橡胶工业 2020年第9期67卷 670-676页

作者： CUI Zhibo SU Zhaoqian HOU Dandan ZHANG Chunsheng WANG Youshan LIU Yuyan WU Jian Key Laboratory of the Ministry of Industry and Information Technology New Energy Conversion and Critical Material Storage TechnologyHarbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China Zhongce Rubber Group Co. LtdHangzhou 310018China

New equations are proposed to describe the shapes and sizes of the contact areas between tire and ground(the contact areas)under the conditions of static load,slip,camber,and *** equations are super ellipse and trigonometric function with four *** indicate that the contact areas under the conditions of static load,slip,camber can be well described by super ellipse,in the most complicated case,fourteen parameters are *** rolling contact area can be reconstructed by the trigonometric function *** and asymmetrical shapes can both be described *** suggested curves will make calculate size of the areas *** described shapes and sizes are in good agreement with the measured,the maximum deviation is only 2.88%.This work will provide an instrument for understanding the contact area and be helpful for analyzing tire and road.

关键词： contact areas contact shape tire and ground super ellipse equation

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Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

Research Square

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Research Square 2021年

作者： Du, Baihe Cheng, Yuan Xun, Liancai Zhang, Shuchang Tong, Jing Lv, Qingrong Zhou, Shanbao Hu, Ping Zhang, Xinghong National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin150001 China School of Physics and Material Science Anhui University Hefei230601 China

To find the optimum balance between strength and toughness, as well as acquiring reliable thermal shock resistance and oxidation resistance, has always been the most concerned topic in the discussion of ultra-high temperature ceramic composites. Herein, PyC modified 3D carbon fiber is used to reinforce ultra-high temperature ceramic. The macroscopic block composite with large size is successfully fabricated through ultra-low temperature sintering at 1300 °C without pressure. The prepared PyC modified 3D Cf/ZrC-SiC composites simultaneously possess excellent physical and chemical stability under the synergistic effect of PyC interface layer and ultra-low temperature sintering without pressure. The fracture toughness is increased in magnitude to 13.05 ± 1.72 MPa∙m1/2 accompanied by reliable flexural strength of 251 ± 27 MPa. After rapid thermal shock spanning from RT to 1200 °C, there is no visible surface penetrating cracks, spalling or structural fragmentation. The maximum critical temperature difference reaches 875 °C, which is nearly three times higher than that of traditional monolithic ceramics. The haunting puzzle of intrinsic brittleness and low damage tolerance are resolved fundamentally. Under the protection of PyC interface layer, the carbon fibers around oxide layer and matrix remain structure intact after static oxidation at 1500 °C for 30 min. The oxide layer has reliable physical and chemical stability and resist the erosion from fierce oxidizing atmosphere, ensuring the excellent oxidation resistance of the composites. In a sense, the present work provides promising universality in designability and achievement of 3D carbon fiber reinforced ceramic composites. © 2021, CC BY.

关键词： Chemical stability

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Bilayer Thermal Metadevices that Mold Transient Heat Flows

SSRN

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SSRN 2023年

作者： Ji, Qingxiang Zhang, Qi Guenneau, Sébastien Kadic, Muamer Wang, Changguo National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150001 China UMI 2004 Abraham de Moivre-CNRS Imperial College LondonSW7 2AZ United Kingdom The Blackett Laboratory Department of Physics Imperial College London LondonSW7 2AZ United Kingdom Université de Franche-Comté Institute FEMTO-ST CNRS Besançon25000 France

Thermal manipulation has been widely researched due to its potential in novel functions, such as cloaking, illusion and sensing. To avoid the spatially inhomogeneous and anisotropic heat conductivity tensors (introduced by transformational thermodynamics), several thermal cloaks based on scattering cancellation (SC) approach are designed and experimentally demonstrated. However, the current SC cloak are only effective in the steady-state heat transfer condition as the heat capacity terms are neglected by the requirement of constant external fields. In order to expand the SC cloak to the transient regime, a bilayer scheme is introduced to achieve the accurate solutions of the camouflage equations considering time factors. Indeed, there are two equations to solve with two unknown quantities: first the thermal conductivity and second the product of specific heat capacity by the density. We construct thermal camouflage devices and verify their ability to mold dynamic heat flows both by simulations and experiments. Our proposed method paves an efficient avenue to extend SC approach to dynamic heat transfer regime. © 2023, The Authors. All rights reserved.

关键词： Thermal conductivity

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Annealing-induced evolution of boron-doped polycrystalline diamond

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Physical Review Materials 2024年第4期8卷 044802-044802页

作者： Gufei Zhang Ramiz Zulkharnay Fabian Ganss Yujie Guo Mohammed Alkhalifah Limin Yang Sen Zhang Shengqiang Zhou Peng Li Yejun Li Victor V. Moshchalkov Jiaqi Zhu Paul W. May National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology 150080 Harbin China Zhengzhou Research Institute Harbin Institute of Technology 450000 Zhengzhou China POLIMA—Center for Polariton-Driven Light-Matter Interactions and Danish Institute for Advanced Study University of Southern Denmark Campusvej 55 DK-5230 Odense M Denmark School of Chemistry University of Bristol Bristol BS8 1TS United Kingdom Institute of Ion Beam Physics and Materials Research Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstraße 400 01328 Dresden Germany Photonics Research Group Department of Information Technology Ghent University-IMEC 9052 Ghent Belgium Department of Chemical Engineering Shandong University of Technology 255000 Zibo China Hunan Key Laboratory of Nanophotonics and Devices School of Physics and Electronics and School of Materials Science and Engineering Central South University 410083 Changsha China Department of Physics and Astronomy KU Leuven B-3001 Heverlee Belgium

Diamond shows great promise for opening up new paradigms in the semiconductor industry and quantum electronics. Here, we investigate the influence of thermal annealing on the structural and electrical transport properties of heavily boron-doped polycrystalline diamond (BPD) thin films. Our structural analyses show that annealing beyond 600∘C can induce severe local amorphization in a BPD thin film and transform it into a binary mixture of spatially separate domains of amorphous carbon (a-C) and diamond grains. Due to this annealing-induced morphology and phase segregation, the BPD thin films demonstrate a significant decrease of the electron localization radius and a distinct increase of the Ginzburg-Landau coherence length. Our research provides physical insight into the conversion of diamond to a-C and aids in defining the application scope of BPD by revealing its heat tolerance.

关键词： Electrical properties Localization Phase transitions Polycrystals Structural properties Amorphous materials Diamond Doped semiconductors Granular solids Low-temperature superconductors Semiconductors Superconductors Annealing Chemical vapor deposition Raman spectroscopy

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A buckling model of fiber-reinforced composite lattice cylinders with the cutout imperfections

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Engineering Fracture Mechanics 2025年 325卷

作者： Wenyu Wang Jian Xiong National Key Laboratory of Science and Technology for Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150080 PR China Structural Lightweighting and Composites Laboratory (StruCM Lab) Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150080 PR China

The lattice load-bearing cylinder structure, with its exceptional strength-to-weight ratio, holds great promise for application in aerospace engineering. To facilitate structural assembly or the embedding of electronic equipment, various types of cutout structures are often designed on the main load-bearing lattice cylinder. The existing theoretical research on the failure mechanism of lattice cylinders primarily focuses on regular structures without cutouts. When the lattice cylinder with cutouts undergoes buckling, the complexity of the ribs’ shape hinders the establishment of the energy function. An analysis of the mechanical performance of lattice cylinders with localized cutouts is undertaken. Based on the buckling patterns derived from simulation analyses, displacement function assumptions are formulated. A multi-failure analysis model is established for lattice cylinders with cutouts, revealing their underlying failure mechanisms. The validity of the theoretical model is confirmed through simulations and experiments. The study’s findings demonstrate the influence of cross-sectional size and helical angle on the type of failure. A three-dimensional failure mechanism diagram is constructed, bridging the gap in the theory of failure modes for this type of structure. The study delves into the correlation between the maximum critical loads and the dimensions of rectangular and circular beams that traverse the interstitial spaces within lattice cylinders characterized by cutouts. The bearing efficiency is also explored in the study, with the optimal geometric point being identified through mapping structural mass contours and following the optimal bearing efficiency trajectory. This approach broadens the design space and provides a theoretical basis for engineering applications.

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Multiscale failure analysis of 3d braided composite structure by coupling FEM and FFT method 22

Multiscale failure analysis of 3d braided composite structur...

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22nd International Conference on Composite Materials, ICCM 2019

作者： Fang, Guodong Wang, Bing Science and Technology on Advanced Composites in Special Environments Key Laboratory Harbin Institute of Technology Harbin150001 China

The progressive damage behavior of three dimensional (3D) braided composite beam is studied by using a more efficient multiscale coupling method including fast Fourier transformation (FFT)-based method and finite element (FE) method. FFT-based method with variational principle is used to overcome the poor convergence for composites with large jumps of material properties in mesoscale. The mechanical response of the braided composites is studied using finite element (FE) method in the macro-scale. The predicted strength and dominated failure modes of the braided composites structure obtained by the proposed method are in good agreement with the experimental results. The high computation efficiency is attractive for large structure with the nonlinear mechanical behavior. © 2019 International Committee on Composite Materials. All rights reserved.

关键词： Fast Fourier transforms

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Anisotropic Tensile Mechanics of Vertically Aligned Carbon Nanotube Reinforced Silicon Carbide Ceramic Nanocomposites

SSRN

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SSRN 2022年

作者： Miao, Linlin Yang, Lingwei Wang, Chuanyun Zhao, Guoxin Li, Junjiao Zhao, Yushun Sui, Chao He, Xiaodong Xu, Zhonghai Wang, Chao Center for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China Hypervelocity Aerodynamics Institute China Aerodynamics Research and Development Center Mianyang621000 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China State Key Laboratory of Solidification Processing Northwestern Polytechnical Univerisity Xi’an710072 China Shenzhen STRONG Advanced Materials Research Institute Co. Ltd China

Vertically aligned carbon nanotubes (VACNTs)/silicon carbide (SiC) nanocomposites (VSNs) present remarkably anisotropic mechanical properties originated from their intrinsic heterogeneous microstructures. However, the studies related to tensile mechanical behaviors and failure mechanisms of VSNs are still suspended so far. In this work, the tensile mechanical properties of VSNs were investigated by an in-situ transmission electron microscopy (TEM) tensile test combined with classic molecular dynamics (MD) simulation. The testing results show that the fracture strength and Young’s modulus of VSNs along CNT-axis ( direction) are higher than those perpendicular to CNT-axis (⊥ direction). In addition, the fracture surface along direction is uneven whereas it is flat along ⊥ direction. The MD simulation reveals that the stronger behavior along direction is mainly benefited by the excellent tensile mechanical properties of CNTs, however, the relatively weak van der Waals interaction between CNTs and SiC matrix dominates the tensile performances of VSNs along ⊥ direction. Finally, the remarkable mechanical anisotropy of VSNs is explained by pulling-out and peeling-off failures of CNTs based on MD simulation. This work provides experimental and theoretical insights into the dominant mechanisms of mechanical anisotropy in typical VACNT/ceramic nanocomposites. © 2022, The Authors. All rights reserved.

关键词： Molecular dynamics

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Analytical and experimental study on high-temperature high-velocity impact limit for C/C composite 22

Analytical and experimental study on high-temperature high-v...

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22nd International Conference on Composite Materials, ICCM 2019

作者： Weihua, Xie Fan, Yang Shuo, Han Songhe, Meng National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin China

Explosively formed debris at low earth orbit is one of the most severe hypervelocity impact loading threats to space shuttle. The collision induced crack or perforation would lead to an unzipping of the thermal protection system (TPS) of the impacted shuttle when the impact occurs in their re-entry stage. So far, SiC coated C/C composite (RCC as abbreviated) as a candidate material for TPS have not been studied sufficiently on their mechanical protection performance. The hypervelocity impact characteristics of RCC at temperatures of 25°C to 1400°C were analysed and discussed in this paper. The experimental test programs were implemented with a converted light gas gun system and results were presented with various impact factors being considered. Furthermore, corresponding simulations were carried out and the morphologies of perforated holes from numerical results were consistent with those observed from tests results. Additionally, a semi-empirical and semi-analytical model was developed and successfully used for predicting the residual velocity and trajectory of the projectiles during the impact. Eventually, comparisons of the ballistic impact response predictions with the experimental results were presented and discussed. © 2019 International Committee on Composite Materials. All rights reserved.

关键词： Space shuttles

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Advances in graphene reinforced metal matrix nanocomposites:Mechanisms,processing,modelling,properties and applications

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Nanotechnology and Precision Engineering 2020年第4期3卷 189-210页

作者： Wenge Chen Tao Yang Longlong Dong Ahmed Elmasry Jiulong Song Nan Deng Ahmed Elmarakbi Terence Liu Hai Bao Lv Yong Qing Fu School of Materials Science and Engineering Xi'an University of TechnologyXi'an 710048PR China Advanced Materials Research Central Northwest Institute for Nonferrous Metal ResearchXi'an 710016PR China School of Materials Science and Engineering Northeastern UniversityShengyang 110819PR China Faculty of Engineering and Environment Northumbria UniversityNewcastle upon Tyne NE18STUK School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083PR China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China

Graphene has been extensively explored to enhance functional and mechanical properties of metalmatrix nanocomposites for wide-range applications due to their superior mechanical,electrical and thermal *** article discusses recent advances of key mechanisms,synthesis,manufacture,modelling and applications of graphene metal matrix *** main strengthening mechanisms include load transfer,Orowan cycle,thermal mismatch,and refinement *** technologies are discussed including some conventional methods(such as liquid metallurgy,powdermetallurgy,thermal spraying and deposition technology)and some advanced processing methods(such as molecular-level mixing and friction stir processing).Analytical modelling(including phenomenological models,semi-empirical models,homogenization models,and self-consistent model)and numerical simulations(including finite elements method,finite difference method,and boundary element method)have been discussed for understanding the interface bonding and performance characteristics between graphene and different metal matrices(Al,Cu,Mg,Ni).key challenges in applying graphene as a reinforcing component for the metal matrix composites and the potential solutions as well as prospectives of future development and opportunities are highlighted.

关键词： Graphene Metal matrix composites Strengthening mechanism Synthesis method Modelling

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