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Formation Mechanism of Nanoparticles in Fe-Cr-Al ODS Alloy Fabricated by Direct Oxidation Method

Acta Metallurgica Sinica(English Letters) 2021年第7期34卷 963-972页

作者： Fuzhao Yan Jing Li Yiyi Li Liangyin Xiong Shi Liu Materials for Special Environments Division CAS Key Laboratory of Nuclear Materials and Safety AssessmentShi-changxu Innovation Center for Advanced MaterialsInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

This study presents the fabrication of 14CrFe-Cr-Al oxide dispersion strengthened(ODS)alloy by a direct oxidation *** order to explain how oxide nanoparticles are formed in the consolidation process,the powders after oxidation are subjected to vacuum thermal treatment at high *** scanning calorimeter,X-ray photoelectron spectroscopy,scanning electron microscopy and transmission electron microscopy techniques are used to detect the generation,evolution of oxides on both the surface and interior of the powder,as well as the type of oxide nanoparticles in the fabricated ODS *** is found that an iron oxide layer is formed on the surface of the powder during low temperature *** the iron oxide layer would be decomposed after thermal treatment at high *** the consolidation process,the oxygen required by the reaction of alumina and yttrium oxide to produce nano scale Y-Al-O particles mainly derives from the decomposition of iron oxide layer at elevated temperature and the inward diffusion of *** the direct oxidation process,YAlO_(3) nanoparticles are dispersed in the grains and at the grain boundaries of Fe-Cr-Al ODS alloy.

关键词： Fe-Cr-Al ODS alloy Direct oxidation Iron oxide layer Y-Al-O nanoparticles Formation mechanism

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Advances in ultra-high temperature ceramics,composites,and coatings

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Journal of advanced Ceramics 2022年第1期11卷 1-56页

作者： Dewei NI Yuan CHENG Jiaping ZHANG Ji-Xuan LIU Ji ZOU Bowen CHEN Haoyang WU Hejun LI Shaoming DONG Jiecai HAN Xinghong ZHANG Qiangang FU Guo-Jun ZHANG State Key Laboratory of High Performance Ceramics&Superfine Microstructure Structural Ceramics and Composites Engineering Research CenterShanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150001China Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsDonghua UniversityShanghai 201620China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China University of Chinese Academy of Sciences Beijing 100049China

Ultra-high temperature ceramics(UHTCs)are generally referred to the carbides,nitrides,and borides of the transition metals,with the Group IVB compounds(Zr&Hf)and TaC as the main *** UHTCs are endowed with ultra-high melting points,excellent mechanical properties,and ablation resistance at elevated *** unique combinations of properties make them promising materials for extremely environmental structural applications in rocket and hypersonic vehicles,particularly nozzles,leading edges,and engine components,*** addition to bulk UHTCs,UHTC coatings and fiber reinforced UHTC composites are extensively developed and applied to avoid the intrinsic brittleness and poor thermal shock resistance of bulk ***,high-entropy UHTCs are developed rapidly and attract a lot of attention as an emerging direction for ultra-high temperature *** review presents the state of the art of processing approaches,microstructure design and properties of UHTCs from bulk materials to composites and coatings,as well as the future directions.

关键词： ultra-high temperature ceramics(UHTCs) coatings composites high-entropy ultra-high temperature ceramics

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Solvent‑aided phase separation in hydrogel towards significantly enhanced mechanoresponsive strength

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Acta Mechanica Sinica 2021年第5期37卷 757-766,I0001页

作者： Haibao Lu Ziyu Xing Mingji Chen Kai Yu Yong Qing Fu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Department of Mechanical Engineering University of Colorado DenverDenverCO 80217USA Faculty of Engineering and Environment University of NorthumbriaNewcastle upon Tyne NE18STUK

Understanding working principles and thermodynamics behind phase separations,which have significant influences on condensed molecular structures and their performances,can inspire to design and fabricate anomalously and desirably mechanoresponsive ***,a combination of techniques from physicochemistry and mechanics has yet been established for the phase separation in *** this study,a thermodynamic model is firstly formulated to describe solvent-aided phase and microphase separations in the hydrogels,which present significantly improved mechanoresponsive ***-Huggins theory and interfacial energy equation have further been applied to model the thermodynamics of concentration-dependent and temperature-dependent phase *** intricately detailed phase map has finally been formulated to explore the working *** thermodynamic methodology of phase separations,combined with the constitutive stress-strain relationships,has a great potential to explore the working mechanisms in mechanoresponsive hydrogels.

关键词： Hydrogel Mechanoresponsive Phase separation Microphase separation

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One stone, two birds: Polyaniline film with the difunctional characteristic of fast-response multi-color electrochromic and excellent super-capacitive behaviors

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Applied Surface science 2025年 707卷

作者： Xuelian Wu Yang Zhou Fenghua Zhang Yanhu Zhang Chunbo Liu Bao Liu School of Mechanical Engineering Jiangsu University Zhenjiang 212013 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150001 China College of Engineering Jilin Normal University Siping 136000 China Automotive Engineering Research Institute Jiangsu University Zhenjiang 212013 China

Electrochromic energy storage (EES) of polyaniline (PANI) materials holds great potential for improving energy efficiency in sustainable development. However, improving and balancing the electrochromic property and capacitance performance of the PANI material remains a significant challenge. Here, the galvanostatic (GS) electropolymerization technique is proposed to prepare a PANI film with outstanding electrochromic and excellent energy-storage properties. The evolutions of the structure mechanism of PANI films are revealed during its two-step growth process. The PANI film displays multicolor transitions across transparent, yellow, green, blue, and purple under applied potentials. Compared to those reported in the PANI-EES literature, the research achieves a greater variety of color variations. Furthermore, a large optical contrast of 50 % at 630 nm and an extremely fast electrical response time of 0.1 s are observed. The PANI film also exhibits a remarkably high specific capacitance of 509 F g −1 and maintains high contrast. The fabricated EES device provides preliminary validation that the PANI film can simultaneously achieve pseudocapacitive behavior and electrochromic behavior in one device. This work achieves PANI films with multi-functional characteristics for various emerging multicolor electronics, supercapacitors, and EES optoelectronic devices.

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A tree-growing graphic model for asymmetrical phantom networks in polymeric gels undergoing dynamic mechanochemical coupling

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science China(Technological sciences) 2024年第2期67卷 558-567页

作者： SHI WeiLin ZHOU Jian LU HaiBao ELMARAKBI Ahmed FU Yong-Qing National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China Faculty of Engineering and Environment University of NorthumbriaNewcastle upon Tyne NEI 8STUK

Network structures of various polymers have significant effects on their mechanical properties;therefore,numerous studies have investigated the constitutive relationship between symmetrical network structures and their rubber elasticity in ***,few studies have focused on asymmetrical network structures in polymers that undergo bond exchange reactions,selfassembly,or mechanochemical coupling—all of which are induced by transition probabilities of chemical bonding *** this study,an extended constraint junction and phantom network model is formulated using the tree-growing theory to establish a constitutive relationship between asymmetrical network structures and their rubber elasticity in polymers.A free-energy equation is further developed to explore working principles of configurational transitions on the dynamic rubber elasticity of symmetrical and asymmetrical network *** constitutive relationship between dynamic rubber elasticity and symmetrical and asymmetrical network structures has also been proposed for the gels undergoing mechanochemical and hydromechanical ***,the effectiveness of this newly proposed tree-growing model has been verified by comparing with the classical affine network model,finite element analysis,and the experimental results of gels reported in literature.

关键词： gel polymer network rubber elasticity asymmetric

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Electrolyte Engineering for High-Voltage Lithium Metal Batteries

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Research 2022年第4期2022卷 781-832页

作者： LiweiDong Shijie Zhong Botao Yuan Yuanpeng Ji Jipeng Liu Yuanpeng Liu Chunhui Yang Jiecai Han Weidong He MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150080China 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 State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150080China Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China School of Mechanical Engineering Chengdu UniversityChengdu610106China

High-voltage lithium metal batteries(HVLMBs)have been arguably regarded as the most prospective solution to ultrahigh-density energy storage devices beyond the reach of current ***,the only component inside the HVLMBs in contact with both aggressive cathode and Li anode,is expected to maintain stable electrode/electrolyte interfaces(EEIs)and facilitate reversible Li+***,traditional electrolytes with narrow electrochemical windows fail to compromise the catalysis of high-voltage cathodes and infamous reactivity of the Li metal anode,which serves as a major contributor to detrimental electrochemical performance fading and thus impedes their practical *** stable electrolytes is vital for the further development of ***,optimization principles,design strategies,and future perspectives for the electrolytes of the HVLMBs have not been summarized in *** review first gives a systematical overview of recent progress in the improvement of traditional electrolytes and the design of novel electrolytes for the *** strategies of conventional electrolyte modification,including high concentration electrolytes and CEI and SEI formation with additives,are *** electrolytes including fluorinated,ionic-liquid,sulfone,nitrile,and solid-state electrolytes are also *** addition,theoretical studies and advanced characterization methods based on the electrolytes of the HVLMBs are probed to study the internal mechanism for ultrahigh stability at an extreme *** also foresees future research directions and perspectives for further development of electrolytes in the HVLMBs.

关键词： electrolyte maintain summarized

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Interface design of cord-rubber composites

Interface design of cord-rubber composites

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18th International Conference on composites Materials, ICCM 2011

作者： Xie, Z. Du, H. Weng, Y. Li, X. National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Center for Composite Materials Harbin Institute of Technology Harbin 150001 China

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Relaxation properties of the solid propellant based on hydroxyl-terminated polybutadiene

Relaxation properties of the solid propellant based on hydro...

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4th International Conference on Materials science and Information technology, MSIT 2014

作者： Xie, Zhi Min Chen, Si Chi Wang, You Shan National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Center for Composite Materials Harbin Institute of Technology Harbin 150001 China

ISBN: (纸本)9783038351733

The polymer-based propellant is a typical viscoelastic material. Better understanding of the relaxation properties of the propellant in the storage conditions is of great importance for predicting the lifetime. Due to the component complexity of the composite propellants, the transformation relation between the relaxation modulus and the complex modulus may not be suitable for all kinds of propellants. In the present work, we focused on the transformation of the relaxation modulus and complex modulus for the HTPB propellant. The master curves for the relaxation modulus and the storage modulus of the aged/unaged HTPB propellants were obtained by performing the stress relaxation tests and DMA tests, respectively. It was found that there existed a great difference in the double logarithmic plot between relaxation modulus and storage modulus master curves. Moreover, the testing results for the relaxation modulus and the storage modulus were well fitted by an empirical transformation relation with three segment-related coefficients. These three coefficients were determined by using the unaged samples, and then were applied to estimate the relaxation modulus of the aged samples. A good agreement between the calculation and the experimental results was also found, revealing that the three coefficients were insensitive to the aging time. © (2014) Trans Tech Publications, Switzerland.

关键词： Elastic moduli

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The optimization of process parameters of three-dimensional needled composites based on ANN and GA 22

The optimization of process parameters of three-dimensional ...

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22nd International Conference on composite Materials, ICCM 2019

作者： Qi, Yun-Chao Fang, Guo-Dong Liang, Jun Xie, Jun-Bo Science and Technology on Advanced Composites in Special Environments Key Laboratory Harbin Institute of Technology Harbin15008 China School of Aerospace Engineering Beijing Institute of Technology Beijing100081 China Key Laboratory of Advanced Textile Composite Materials of Ministry of Education Tianjin Polytechnic University Tianjin300387 China

To build the relationship between needled process parameters and C/C-SiC composites stiffness, and get better process parameters to improve the stiffness performances of composites, a surrogate model for optimizing process parameters of three dimensional needled preforms of C/C-SiC composites was established based on back propagation (BP) neural network combing with improved genetic algorithm. The stiffness prediction was realized by BP network. The predicted value of the network is almost identical with the finite element calculation, so the prediction accuracy of the model is high. The genetic strategy and optimization strategy of genetic algorithm were improved. Two improved genetic algorithms were used to optimize the process parameters. The obtained process parameters can significantly improve the stiffness of the material. © 2019 International Committee on composite Materials. All rights reserved.

关键词： Genetic algorithms

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A comparative study on the viscoelastic models for rubbery materials

A comparative study on the viscoelastic models for rubbery m...

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3rd International Conference on Applied Materials and Electronics Engineering, AMEE 2014

作者： Xie, Zhi Min Zhang, Jing Wang, You Shan National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Center for Composite Materials Harbin Institute of Technology Harbin 150001 China

ISBN: (纸本)9783038350583

The rubbery materials play an important role in the acoustic metamaterials composed of locally resonant structures. To determine the unusual behavior of the dynamic mass density and bulk modulus in acoustic metamaterials in detail, better understanding of the viscoelasticity of rubbery materials is necessary. In the present work, we demonstrated the difference between the fractional and integer constitutive models in describing the viscoelastic behaviors in terms of the natural rubber(NR) and silicone rubber(SR). Test results for the relaxation modulus show that the Maxwell model is not suitable for NR and SR. The fractional Scott-Blair model gave a better estimation for the relaxation modulus but had a more sophisticated relation than the classical Maxwell model did. Compared with the other constitutive models, the fractional Maxwell model gave a better description of the mechanical properties for NR and SR, but it involved four independent parameters to be determined experimentally. By fitting test results in the double logarithmic plot of the modulus and loading time, all the parameters of the fractional Maxwell model were obtained. The present work provided a base for the analysis of the membrane-type acoustic metamaterials. © (2014) Trans Tech Publications, Switzerland.

关键词： Viscoelasticity

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