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Nacre-inspired interface structure design of polymer bonded explosives toward significantly enhanced mechanical performance

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Defence Technology（防务技术） 2023年第9期27卷 83-92页

作者： Peng Wang You-long Chen Li Meng Yin-shuang Sun Yu Dai Xin Li Jie Chen Zhi-jian Yang Guan-song He institute of Chemical material China Academy of Engineering PhysicsMianyang621900China

Realizing effective enhancement to the structure of interface region between explosive crystals and polymer binder plays a key role in improving the mechanical properties of the current polymer bonded explosives(PBXs).Herein,inspired by the structure of natural nacre which possesses outstanding mechanical performance,a kind of nacre-like structural layer is constructed in the interface region of PBXs composites,making use of two-dimensional graphene sheets and one-dimensional bio-macromolecules of cellulose as inorganic and organic building blocks,*** results reveal that the constructed nacre-like structural layer can effectively improve the interfacial strength and then endow the PBXs composites with significantly enhanced mechanical properties involving of creep resistance,Brazilian strength and fracture toughness,demonstrating the obvious advantage of such bioinspired interface structure design *** addition,the thermal conduction performance of PBXs composites also exhibits noticeable enhancement due to the remarkable phonon transport capability endowed by the asdesigned nacre-like structural *** believe this work provides a novel design route to conquer the issue of weak interfacial strength in PBXs composites and greatly increase the comprehensive properties for better meeting the higher requirements proposed to the explosive part of weapon equipment in new era.

关键词： Polymer bonded explosives Nacre-like structural layer Graphene Cellulose Mechanical properties

Effect of the chloride ion on advanced oxidation processes catalyzed by Fe-based metallic glass for wastewater treatment

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Journal of materials Science & Technology 2022年第22期117卷 49-58页

作者： Shuangqin Chen Mai Li Qingmin Ji Tao Feng Si Lan KeFu Yao School of material Science and Engineering Herbert Gleiter Institute of NanoscienceNanjing University of Science and TechnologyNanjing 210094China School of material Science and Engineering Tsinghua UniversityBeijing 100084China School of material Science and Engineering Nanjing Institute of TechnologyNanjing 211167China

Fe-based metallic glasses (Fe–MGs) are potential candidate catalysts for advanced oxidation processes(AOPs) for recalcitrant organic pollutant degradation. However, industrial wastewater and natural contaminated sites usually contain abundant inorganic ions, like the chloride ion (Cl−), which significantly affectAOPs, but their influence on MG-activated AOPs still remains unclear. Through the study of three commonly used oxidants, hydrogen peroxide (H_(2)O_(2)), peroxydisulfate (PDS), and peroxymonosulfate (PMS), theeffect of Cl− on the FeSiB-catalyzed process of degradation of the typical azo dye Orange Ⅱ was investigated. Evidence indicates that the addition of Cl− resulted in the monotonous inhibition of the degradation process when the H_(2)O_(2)/FeSiB and PDS/FeSiB systems were employed, but promoted effect wasdetected with the PMS/FeSiB system, which is different from the previously observed dual effect of Cl−.It is closely relative with FeSiB induced unique variety of degradation pathways, including radicals, nonradicals (^(1)O_(2)), and direct reduction degradation. Moreover, the presence of Cl− significantly affected thesystems’ absorbable organic halogen content and the amount of Fe leached into the solution. The resultsof this work will provide essential references for Fe-based MG used as AOP catalysts in field applicationsand the development of advanced MGs with excellent adaptability to complex environments.

关键词： Fe-based metallic glass Advanced oxidation processes Wastewater treatment Chlorine ion

Comparison between compression tested and simulated Mg-6.3Gd bone scaffolds produced by binder based additive manufacturing technique

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Journal of Magnesium and Alloys 2023年第8期11卷 2750-2762页

作者： Martin Wolff Mohammad Marvi-Mashhadi Eshwara Nidadavolu Henrik Lüneburg Thomas Ebel Regine Willumeit-Römer institute of Metallic Biomaterials at Helmholtz-Zentrum Hereon Max-Planck Str.1D-21502 GeesthachtGermany institute of material systems Modeling Helmholtz-Zentrum HereonMax–Planck-Str.121502 GeesthachtGermany

In this study,a binder based 3D-printing technology *** Granular Fabrication(FGF)technique was used to produce interconnected and open porous Mg-6.3Gd bone scaffolds for compression test *** consolidation of the green parts(as printed scaffolds)was performed using solvent debinding in cyclohexane and subsequent conventional sintering in argon *** tests were performed on as sintered ***,a simulation strategy was developed for modeling the compression behavior of the sintered parts,utilizing the data from the experimental *** experimental compression test results and the simulation strategy for the compression behavior of the 3D-printed scaffolds demonstrated good agreement.

关键词： Magnesium Mg-6.3Gd Additive manufacturing Simulation FGF Biodegradable

SOME ASPECTS OF MORPHOLOGIES AND INTERFACES IN COPOLYMER/HOMOPOLYMER BLENDS

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Chinese Journal of Polymer Science 1988年第4期6卷 345-352页

作者：江明曹宪一于同隐 institute of material Science Fudan University Fudan University Shanghai

Based on a series of morphological studies of blends of homopolymer (Homo) and a variety of block and graft copolymers (Cop), the nature of phase separation, interface, emulsification and inner morphology of copolymer-dispersed phase etc. in the blends are discussed. In the cases of Cop AB/Homo A/Homo B systems, in which one homopolymer forms matrix, it is observed that the dispersed homopolymer phase is exclusively associated with Cop AB, i.e. no Homo A-Homo B interface exists. This phenomenon is believed to be caused by minimizing the interfacial energy of the systems. Meanwhile, preferential solubilization or anchoring of the like chains of copolymer into homopolymer matrix leads to stabilization of the dispersed phase in the matrix. In addition, regular variation of the inner morphology of the dispersed copolymer phase with the composition and molecular parameters of the component polymers is observed. When the two components have comparable proportions, alternating concentric shells are the most common feature which is associated with minimizing the interfacial energy in the Cop/Homo systems.

关键词： Polymer blends Morphology Interface Emulsification

Thermal properties of high temperature vacuum receivers used for parabolic trough solar thermal power system

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Progress in Natural Science:materials International 2017年第4期27卷 410-415页

作者： Qinghe Yu Jing Mi Yufan Lang Miao Du Shijie Li Hailing Yang Lei Hao Xiaopeng Liu Lijun Jiang Department of Energy material & Technology General Research Institute for Non-Ferrous Metals

The receiver's emittance and vacuum pressure are the two of great significance issues on the heat-loss which is the main factor reducing the efficiency of the parabolic though systems. In this paper, the thermal steady-state equilibrium method was used to test the receivers heat-loss. The receivers with increasing emittance were tested to study the variation of heat-loss. Meanwhile, the variable vacuum pressure in the annulus that affects the efficiency of the system was investigated. The influence of vacuumizing rate and getters on the vacuum pressure and heat-loss were discussed. The result shows that the emittance and vacuum pressure affect the receiver's heat-loss dramatically, and the emittance is the major influence factor on the thermal properties. The receiver with 0.08 emittance and 10-3Pa vacuum pressure has a satisfactory heat-loss of 215.6 W/m at 400 ℃.The analysis further reveals that the synergistic effect of both emittance and vacuum pressure on the heat-loss can be reflected by the packaging temperature of the glass tube, and a fitting formula has been established to estimate the receivers' heat-loss according to the packaging temperature of the glass tube.

关键词： Parabolic trough receiver Heat-loss Emittance Vacuum pressure

Enhancing 3D Reconstruction Accuracy of FIB Tomography Data Using Multi‑voltage Images and Multimodal Machine Learning

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Nanomanufacturing and Metrology 2024年第1期7卷 48-60页

作者： Trushal Sardhara Alexander Shkurmanov Yong Li Lukas Riedel Shan Shi Christian J.Cyron Roland C.Aydin Martin Ritter institute for Continuum and material Mechanics Hamburg University of TechnologyHamburgGermany Electron Microscopy Unit Hamburg University of TechnologyHamburgGermany institute of materials Physics and Technology Hamburg University of TechnologyHamburgGermany institute of materials Mechanics Helmholtz-Zentrum HereonGeesthachtGermany Research Group of Integrated Metallic Nanomaterials systems Hamburg University of TechnologyHamburgGermany institute of material systems Modeling Helmholtz-Zentrum HereonGeesthachtGermany

FIB-SEM tomography is a powerful technique that integrates a focused ion beam(FIB)and a scanning electron microscope(SEM)to capture high-resolution imaging data of *** approach involves collecting in-plane SEM imagesand using FIB to remove material layers for imaging subsequent planes,thereby producing image ***,theseimage stacks in FIB-SEM tomography are subject to the shine-through effect,which makes structures visible from theposterior regions of the current *** artifact introduces an ambiguity between image intensity and structures in thecurrent plane,making conventional segmentation methods such as thresholding or the k-means algorithm *** study,we propose a multimodal machine learning approach that combines intensity information obtained at differentelectron beam accelerating voltages to improve the three-dimensional(3D)reconstruction of *** treatingthe increased shine-through effect at higher accelerating voltages as a form of additional information,the proposed methodsignificantly improves segmentation accuracy and leads to more precise 3D reconstructions for real FIB tomography data.

关键词： Multimodal machine learning Multi-voltage images FIB-SEM Overdeterministic systems 3D reconstruction FIB tomography

Mechanisms of yttrium on the wettability,surface tension and interactions between Ni-20Co-20Cr-10Al-ξY alloys and MgO ceramics

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Journal of materials Science & Technology 2021年第11期70卷 39-48页

作者： Jinpeng Li Huarui Zhang Ming Gao Qingling Li Weidong Bian Yongshuang Cui Tongxiang Tao Hu Zhang School of materials Science and Engineering Beihang UniversityBeijing100191China China Aerospace Academy of systems Science and Engineering Beijing100048China Qingdao institute of New material Technology of Beihang University Qingdao266000China

The mechanisms of Y on the wettability,surface tension,and interactions between the Ni-20 Co-20 Cr-10 Al-ξY alloys and MgO ceramics at 1873 K were investigated by sessile drop *** results of nonlinear fitting showed that the equilibrium contact angles and Y concentrations were approximately in accord with the log-normal distribution *** equilibrium contact angles changed from 101.5°to 140.5°with Y increasing from 0 wt.%to 1.23 wt.%.Cross-sectional microstructure observations revealed that the thermal dissociation of ceramics occurred and the released[O]atoms can react with Y to produce Y_(2)O_(3) reaction layer along three-phase interphase *** kinetics analyses indicated that surface tension of the melt droplets had been positively correlated with the Y concentrations,and it increased from 737.8–1045.1 mN/***,the pinning effect of the rough substrate surface on the three-phase line hindered the spreading of the liquid on *** change in total free energy of the alloys/ceramics system was considered as the key factor affecting the ***,the surface morphology and thermodynamic stability of ceramics also had some influence on the wettability.

关键词： Yttrium Wettability Interfacial interaction Surface tension Three-phase line

Direct alloying of immiscible molybdenum-silver system and its thermodynamic mechanism

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Journal of materials Science & Technology 2021年第6期65卷 18-28页

作者： Jinlong Du Cai Li Zumin Wang Yuan Huang institute of Advanced Metallic materials School of Material Science and EngineeringTianjin UniversityTianjin 300072China

Direct alloying is difficult to be realized in an immiscible Mo-Ag system with a positive formation heat due to the absence of thermodynamic driving force at *** this work,a direct alloying method is developed to realize the direct alloying between Mo and Ag and construct Mo-Ag *** direct alloying method was mainly carried out through a direct diffusion bonding for Mo and Ag rods at a temperature close to the melting point of Ag(Tm Ag).Then the microstructure and phase constitution of the as-constructed Mo-Ag interface are *** results show that Mo-Ag metallurgical bonding interface has been constructed successfully,indicating that a direct alloying in the immiscible Mo-Ag system has been ***,mechanical tests are carried out for the Mo-Ag joints prepared through the direct alloying *** test results show that the average maximum tensile strength of the joints is about 107 *** effect of alloying parameters on the tensile strength is also discussed,which shows that there is an effective temperature range for the direct alloying between Mo and ***,an improved thermodynamic model that considers the formation of Mo-Ag crystalline and amorphous phase is presented to reveal the thermodynamic mechanism of the direct *** the calculation and differential scanning calorimetry(DSC)tests results,the Gibbs energy diagram for the direct alloying is *** is confirmed that the co-release of storage energy and surface energy can serve as the thermodynamic driving force to overcome the effect of positive formation heat and lead to direct alloying for Mo-Ag systems.

关键词： Direct alloying Immiscible Mo-Ag system Metallurgical bonding interface Thermodynamic driving force Joints

Reconstruction of the Density Profile for the EAST Tokamak Based on Polarimeter/Interferometer and Microwave Reflectometer systems

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Plasma Science and Technology 2015年第9期17卷 733-737页

作者：朱翔曾龙刘海庆揭银先张寿彪胡建生高翔 School of Physics and material Science Anhui University institute of Plasma Physics Chinese Academy of Sciences

A plasma density profile reconstruction procedure based on the Park matrix method has been developed for both circular and elongated plasma configuration on the Experimental Advanced Superconducting Tokamak（EAST）.This method incorporates the line integrated electron density measured by the HCN interferometer and polarimeter/interferometer（POINT） system,the equilibrium fit（EFIT） based on magnetic measurements and the edge electron density profile provided by the microwave *** is shown that when the magnetic flux surfaces are slightly corrected,the fitting error is less than 5% in comparison with the measurement data.

关键词： density profile reconstruction POINT microwave reflectometer