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Recent progress in constructing fluorinated solid-electrolyte interphases for stable lithium metal anodes

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 270-291页

作者： Di Zhang Pengfei Lv Wei Qin Xin He Yuanhua He civil aircraft Fire Science and Safety Engineering key laboratory of Sichuan Province College of Civil Aviation Safety EngineeringCivil Aviation Flight University of ChinaGuanghan 618307China School of Chemical Engineering Sichuan UniversityChengdu 610065China

Lithium metal batteries(LMBs)are emerging as a promising energy storage solution owing to their high energy density and specific ***,the non-uniform plating of lithium and the potential rupture of the solid-electrolyte interphase(SEI)during extended cycling use may result in dendrite growth,which can penetrate the separator and pose significant short-circuit *** a stable SEI is essential for the long-term operation of the ***-rich SEI has garnered significant attention for its ability to effectively passivate electrodes,regulate lithium deposition,and inhibit electrolyte *** the structural components and preparation methods of existing fluorinated SEI is crucial for optimizing lithium metal anode *** paper reviews the research on optimizing LiF passivation interfaces to protect lithium metal *** focuses on four types of compositions in fluorinated SEI that work synergistically to enhance SEI *** instance,combining compounds with LiF can further enhance the mechanical strength and ionic conductivity of the *** metals with LiF significantly improves electrochemical performance at the SEI/anode interface,with a necessary focus on reducing electron tunneling ***,incorporating polymers with LiF offers balanced improvements in interfacial toughness and ionic conductivity,though maintaining structural stability over long cycles remains a critical area for future *** alloys combined with LiF increase surface energy and lithium affinity,challenges such as dendrite growth and volume expansion *** summary,this paper emphasizes the crucial role of interfacial structures in LMBs and offers comprehensive guidance for future design and development efforts in battery technology.

关键词： LiF lithium metal anodes solid-electrolyte interphase interface cycling stability

Distributed fiber optic sensing system for vibration monitoring of 3D printed bridges

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Optoelectronics Letters 2025年第1期21卷 28-34页

作者： ZHAO Shuai ZHOU Ran LUO Mingming LIU Jianfei LIU Xiongfei ZHOU Tao School of Electronic Information Engineering Hebei University of Technology tianjin key laboratory of Electronic Materials and Devices School of civil Engineering and Transportation Hebei University of Technology tianjin Jinhang Institute of Technical Physics

The fiber optic sensing technology provides data support in structural health monitoring of the macro facilities, including design, construction, and maintenance of bridges, tunnels, ports and other infrastructures. In this paper, a distributed vibration sensing system is proved to be responsive to a single touch over a 1.8-m-long equivalent fiber segment, covering a vibration frequency from 5 Hz to 25 kHz. The sensing fiber was arranged as an S type layout on the bridge to recognize the standing state, windblown disturbance, and walking vibration. Moreover, the knocking and climbing events are recognized fiber laying spinning lines and hanging on the fences, respectively. The demonstration shows an accurate positioning and sensitive vibration monitoring applied on the automated three-dimensional(3D) printed bridge, which is applicable to all kinds of 3D printed facilities as intelligent sensory neuro-networks.

关键词： Spinning (fibers)

Mechanical, elastic, anisotropy, and electronic properties of monoclinic phase of m-SixGe3-xN4

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Chinese Physics B 2017年第12期26卷 402-411页

作者：马振洋阎芳王苏鑫贾琼琼于新海史春蕾 tianjin key laboratory for civil aircraft airworthiness and maintenance Civil Aviation University of China Tianjin 300300 China

The structural, mechanical, elastic anisotropic, and electronic properties of the monoclinic phase of m-Si3N4, m-Si2GeN4, m-SiGe2N4, and m-Ge3N4 are systematically investigated in this work. The calculated results of lattice parameters, elastic constants and elastic moduli of m-Si3N4 and m-Ge3N4 are in good agreement with previous theoretical results. Using the Voigt-Reuss-Hill method, elastic properties such as bulk modulus B and shear modulus G are investigated. The calculated ratio of B/G and Poissons ratio v show that only m-SiGe2N4 should belong to a ductile material in nature. In addition, m-SiGe2N4 possesses the largest anisotropic shear modulus, Youngs modulus, Poissons ratio, and percentage of elastic anisotropies for bulk modulus AB and shear modulus AG, and universal anisotropic index AU among m-SixGe3-xN4 （x=0, 1, 2, 3.） The results of electronic band gap reveal that m-Si3N4, m-Si2GeN4, m-SiGe2N4, and m-Ge3N4 are all direct and wide band gap semiconducting materials.

关键词： SixGe3-xN4 mechanical properties elastic anisotropic electronic properties

Physical properties of B_4N_4-Ⅰ and B_4N_4-Ⅱ:First-principles study

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Chinese Physics B 2019年第3期28卷 283-290页

作者： Zhenyang Ma Peng Wang Fang Yan Chunlei Shi Yi Tian key laboratory of civil aircraft airworthiness Technology Civil Aircraft Airworthiness and Repair Key Laboratory of TianjinSchool of AirworthinessCivil Aviation University of China

The structural, mechanical, electronic, mechanical anisotropy, and thermal properties of boron nitride(BN) polymorphs, such as B_4 N-4-Ⅰ and B4 N4-Ⅱ, are investigated under ambient pressure utilizing first-principles generalized gradient approximation calculations using an ultrasoft pseudopotential scheme. The phonon spectra and elastic constants reveal that B_4 N_4-Ⅰ is dynamically and mechanically stable at the pressure of 0 GPa and temperature of 0 K. Anisotropic calculations indicate that both B_4 N_4-Ⅰ and B4 N4-Ⅱ exhibit higher anisotropy of Young's modulus than cubic BN(c-BN). B_4 N_4-Ⅱ and B_4 N_4-Ⅰ present indirect and wide band gaps of 5.32 eV and 4.86 eV, respectively. In addition, B_4 N_4-Ⅰ is more brittle than B_4 N_4-Ⅱ. Moreover, the minimum thermal conductivity,κmin, of B4 N4-Ⅱ at 300 K is 1.92 W/(cm·K), which is slightly higher than those of B_4 N_4-Ⅰ and c-BN(1.84 W/(cm-K) and 1.83 W/(cm-K), respectively. However, κ_(min) of B_4 N_4-Ⅰ is slightly higher than that of c-BN.

关键词： BN polymorphs mechanical properties electronic properties mechanical anisotropic properties

Fouling corrosion in aluminum heat exchangers

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Chinese Journal of Aeronautics 2015年第3期28卷 954-960页

作者： Su Jingxin Ma Minyu Wang tianjing Guo Xiaomei Hou Liguo Wang Zhiping tianjin key laboratory for civil aircraft airworthiness and maintenance Civil Aviation University of China aircraft maintenance and Engineering Corporation Beijing Capital International Airport

Abstract Fouling deposits on aluminum heat exchanger reduce the heat transfer efficiency and cause corrosion to the apparatus. This study focuses on the corrosive behavior of aluminum cou- pons covered with a layer of artificial fouling in a humid atmosphere by their weight loss, Tafel plots, electrochemical impedance spectroscopy （EIS）, and scanning electron microscope （SEM） observations. The results reveal that chloride is one of the major elements found in the fouling which damages the passive film and initiates corrosion. The galvanic corrosion between the metal and the adjacent carbon particles accelerates the corrosive process. Furthermore, the black carbon favors the moisture uptake, and gives the dissolved oxygen greater chance to migrate through the fouling layer and form a continuous diffusive path. The corrosion rate decreasing over time is conformed to electrochemistry measurements and can be verified by Faraday＇s law. The EIS results indicate that the mechanism of corrosion can be interpreted by the pitting corrosion evolution mechanism, and that pitting was observed on the coupons by SEM after corrosive exposure.

关键词： Aluminum EIS Heat exchanger Pitting corrosion Tafel plots

Stability and performance analysis of a jump linear control system subject to digital upsets

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Chinese Physics B 2015年第4期24卷 6-15页

作者：王蕊孙辉马振洋 tianjin key laboratory for civil aircraft airworthiness and maintenance Civil Aviation University of China College of Aeronautical Automation Civil Aviation University of China

This paper focuses on the methodology analysis for the stability and the corresponding tracking performance of a closed-loop digital jump linear control system with a stochastic switching signal. The method is applied to a flight control system. A distributed recoverable platform is implemented on the flight control system and subject to independent digital upsets. The upset processes are used to stimulate electromagnetic environments. Specifically, the paper presents the scenarios that the upset process is directly injected into the distributed flight control system, which is modeled by independent Markov upset processes and independent and identically distributed （IID） processes. A theoretical performance analysis and simulation modelling are both presented in detail for a more complete independent digital upset injection. The specific examples are proposed to verify the methodology of tracking performance analysis. The general analyses for different configurations are also proposed. Comparisons among different configurations are conducted to demonstrate the availability and the characteristics of the design.

关键词： stochastic process stability and performance analysis jump linear system digital upsets

Numerical simulation of TBCs residual stresses by the growth of TGO on typical interface morphology

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China Welding 2012年第2期21卷 64-68页

作者：韩志勇张华王志平 tianjin key laboratory for civil aircraft airworthiness and maintenance University of ChinaTianjin300300

The effect of TGO （ thermally grown oxide ） growth based on typical interface morphology on residual stresses distribution in thermal barrier coatings was analyzed by ABAQUS software. TGO oxidation kinetics, the relationship between TGO thickness and thermal cycles number, and typical morphology including sinusoid , cone and groove were considered in the calculation process. 13 FEM （finite element method） models with different TGO thickness based on uniform interface morphology were established for analysis. The calculation results show that TCC （ top ceramic coating ） /TGO and TGO/BC （bond coating） interface residual stresses are affected significantly by inter）hce morphology and TGO thickness, both of which increase significantly with TGO growth ; the stress level in TCC/TGO interface is greater than that of TGO/BC interface ; each morphology peak exhibits tensile stress while each valley exhibits compressive stress in TCC/TGO interface; stress concentrates in such locations as each morphology center with sharp angle and the stress reaches the maximal value at the tip of each angle.

关键词： thermal barrier coatings FEM residual stress interface morphology TGO growth

Enhanced vibration suppression and energy harvesting in fluid-conveying pipes

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Applied Mathematics and Mechanics(English Edition) 2023年第9期44卷 1487-1496页

作者： Yang JIN Tianzhi YANG tianjin key laboratory for civil aircraft airworthiness and maintenance Civil Aviation University of ChinaTianjin 300300China School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China

A novel vibration absorber is designed to suppress vibrations in fluidconveying pipes subject to varying fluid *** proposed absorber combines the fundamental principles of nonlinear energy sinks(NESs)and nonlinear energy harvesters(NEHs).The governing equation is derived,and a second-order discrete system is used to assess the performance of the developed *** results demonstrate that the proposed absorber achieves significantly enhanced energy dissipation efficiency,reaching up to 95%,over a wider frequency ***,it successfully harvests additional electric *** research establishes a promising avenue for the development of new nonlinear devices aimed at suppressing fluid-conveying pipe vibrations across a broad frequency spectrum.

关键词： fuid-conveying pipe vibration suppression nonlinear energy sink(NES) electromagnetic energy harvesting

Calculation of high-speed abrasion forces for ceramic coatings based on the Hertzian contact model

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China Welding 2024年第1期33卷 52-59页

作者：裴祥忠丁坤英 tianjin key laboratory for civil aircraft airworthiness and maintenance Civil Aviation University of ChinaTianjin 300300China

Aero engine seal coatings can effectively improve the air tightness of aircraft engines and increase fuel ***,due to the frictional forces between the blades and the coating,the coating often flakes off,resulting in damage to the blades and causing eco-nomic ***,it is necessary to analyze the friction between the blades and the *** this paper,three ceramic-based high-temperature seal coatings with different polyphenylene ester contents and a pure Yttria-stabilised zirconia coating were prepared by atmo-spheric plasma spraying(APS).The hardness and modulus of elasticity of the coated surfaces were obtained by hardness and modulus of elasticity tests,and the coatings were subjected to high-speed touch abrasion *** Hertzian contact model was used to calculate the maximum normal contact load on the coating during the *** test values were compared with the theoretical values and it was found that the calculated values were always greater than the test *** order to make the Hertzian contact model more accurate in calculating the touching and abrasion forces,the contact coefficients in the Hertzian contact model were *** the optimized coeffi-cients into the Hertzian contact model,the results show that the calculated results after optimizing the coefficients are much closer to the test values,with deviations from the test values ranging from 1%to 38%.

关键词： sealing coating atmospheric plasma spraying high-speed collision and wear Hertzian contact model optimization coefficient