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High-entropy(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3:A promising thermal/environmental barrier material for oxide/oxide composites

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Journal of Materials Science & Technology 2020年第12期47卷 45-51页

作者： Zifan Zhao Heng Chen Huimin Xiang Fu-Zhi Dai Xiaohui Wang Wei Xu kuang sun Zhijian Peng Yanchun Zhou Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing100076China School of Engineering and Technology China University of GeosciencesBeijing 100083China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Shanghai Chenhua Science and Technology Corporation Limted Shanghai201804China

Yttrium aluminum perovskite(YAl O3)is a promising candidate material for environmental barrier coatings(EBCs)to protect Al2 O3 f/Al2 O3 ceramic matrix composites(CMCs)from the corrosion of high-temperature water vapor in combustion ***,the relatively high thermal conductivity is a notable drawback of YAl O3 for environmental barrier coating ***,in order to make REAl O3 more thermal insulating,a novel high-entropy rare-earth aluminate ceramic(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3 was designed and *** as-prepared(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3 ceramic possesses close thermal expansion coefficient(9.02×10-6/oC measured from room temperature to 1200℃)to that of Al2 *** thermal conductivity of(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3 at room temperature is 4.1 W·m-1K-1,which is almost one third of the value of YAl ***,to effectively prevent the penetration of water vapor from possible pores/cracks of coating layer,which are often observed in T/EBCs,a tri-layer EBC system REAl O3/RE3 Al5 O12/(Al2 O3 f/Al2 O3 CMCs)is *** thermal expansion coefficient to Al2 O3 and low thermal conductivity of(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3,as well as the formation of dense garnet layer at(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3/Al2 O3 interface,indicate that this new type of high-entropy ceramic is suitable as a candidate environmental barrier coating material for Al2 O3 f/Al2 O3 CMCs.

关键词： High-entropy ceramics (Y0.2Nd0.2Sm0.2Eu0.2Er0.2AlO3 Tri-layer EBC system Low thermal conductivity Al2O3f/Al2O3 CMCs

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High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications

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Journal of Advanced Ceramics 2020年第3期9卷 303-311页

作者： Zifan ZHAO Heng CHEN Huimin XIANG Fu-Zhi DAI Xiaohui WANG Wei XU kuang sun Zhjjian PENG Yanchun ZHOU Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China School of Engineering and Technology China University of GeosciencesBejing 100083China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shanghai Chenhua Science and Technology Corporation Ltd. Shanghai 201804China

Rare-earth tantalates and niobates(REjTaO7 and REjNbO7)have been considered as promising candidate thermal barrier coating(TBC)materials in next generation gas-turbine engines due to their ultra-low thermal conductivity and better thermal stability than yttria-stabilized zirconia(YSZ).However,the low Vickers hardness and toughness are the main shortcomings of RE;TaO-and REjNbOr that limit their applications as TBC *** increase the hardness,high entropy(Yu3Ybu3Er/3)sTaOr,(Y13YbnErns)NbO,and(Sm1/6Eu1/6Y 1/6Yb1/6Lu1/6Er1/6)3(Nb1/2Ta1/2)O7 are designed and synthesized in this *** high entropy ceramics exhibit high Vickers hardness(10.912.0 GPa),close thermal expansion coefficients to that of single-principal-component RE3TaO,and RE;NbO,(7.9×10^-6-10.8×10-6 C-1 at room temperature),good phase stability,and good chemical compatibility with thermally grown Al2O3,which make them promising for applications as candidate TBC materials.

关键词： high entropy ceramics defective fluorite structure rare-earth niobates/tantalates thermal barrier coating material

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High entropy(Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12:A novel high temperature stable thermal barrier material

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Journal of Materials Science & Technology 2020年第13期47卷 57-62页

作者： Heng Chen Zifan Zhao Huimin Xiang Fu-Zhi Dai Wei Xu kuang sun Jiachen Liu Yanchun Zhou Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing100076China Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin300072China Shanghai Chenhua Science and Technology Corporation Limted Shanghai201804China

Ytterbium aluminum garnet(Yb3Al5O12)is considered as a promising thermal barrier ***,the main limitations of Yb3Al5O12 for thermal barrier applications are relative low thermal expansion coefficient and high thermal *** order to overcome these obstacles,herein,a new high entropy(Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 ceramic was designed,and then powders and bulk were prepared through solid-state reaction method and spark plasma sintering(SPS),*** thermal expansion coefficient of HE(Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 is(8.54±0.29)×10^-6 K^-1 at 673 K–1273 K,which is about 9%higher than that of *** thermal conductivity of HE(Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 ceramic is 3.81 W·m^-1 K^-1 at 300 K,which is about 18%lower than that of ***,there is no reaction between HE(Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 and thermally grown(TG)Al2O3 even at 1600℃.After annealing at 1590℃for 18 h,the average grain size of HE(Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 increases only from 1.56μm to 2.27μ*** thermal expansion coefficient to TG Al2O3,low thermal conductivity,good phase stability,excellent chemical compatibility with TG Al2O3 and slow grain growth rate make HE(Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 promising for thermal barrier applications.

关键词： High entropy ceramics (Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 Thermal barrier coatings Thermal conductivity Garnet

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(Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7: A defective fluorite structured high entropy ceramic with low thermal conductivity and close thermal expansion coefficient to Al2O3

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Journal of Materials Science & Technology 2020年第4期39卷 167-172页

作者： Zifan Zhao Heng Chen Huimin Xiang Fu-Zhi Dai Xiaohui Wang Wei Xu kuang sun Zhijian Peng Yanchun Zhou School of Engineering and Technology China University of GeosciencesBeijing 100083China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shanghai Chenhua Science and Technology Corporation Limted Shanghai 201804China

Al2O3f/Al2O3 ceramic matrix composites(CMC)are promising candidate materials of blades and combustor liners of future gas turbines in light of their higher temperature capability,higher environmental stability and oxidizing-free capacity[1–3].Nevertheless,grain growth,sintering and creep deformation at high operation temperatures are still serious problems for Al2O3f/Al2O3 ceramic matrix composites,which can lead to a reduction in the strength and damage tolerance[2].Moreover,Al2O3 can be corroded by the high temperature water vapor in combustion environments and yields volatile products,such as Al(OH)3[4].Consequently,environmental barrier coatings(EBCs)are necessary for Al2O3f/Al2O3 ceramic matrix composites,which can protect Al2O3f/Al2O3 CMC from high temperature and flowing combustion gas corrosion and thus increase the high temperature capability and the service life of components.

关键词： Al2O3f/Al2O3 ceramic matrix conductivity close thermal expansion

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Theoretical predictions and experimental verification on the phase stability of enthalpy-stabilized HE TMREB_(2)s

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Journal of Materials Science & Technology 2022年第26期121卷 154-162页

作者： Ze Zhang Shizhen Zhu Fu-Zhi Dai Huimin Xiang Yanbo Liu Ling Liu Zhuang Ma Shijiang Wu Fei Liu kuang sun Yanchun Zhou School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials and Processing TechnologyBeijing 100076China National Key Laboratory of Science and Technology on Materials Under Shock and Impact Beijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314019China Zibo Firststar New Material Incorporated Co. Ltd.Zibo 255000China Shanghai Chenhua Science and Technology Corporation Ltd. Shanghai 201804China

Transition metal diborides(TMB_(2)s)are the materials of choice in extreme environments due to their excellent thermal and chemical ***,the degradation of oxidation resistance of TMB_(2)s at elevated temperature still hinders their *** cope with this challenge,it is effective to incorporate rare earth elements to form high-entropy transition and rare-earth metal diborides(HE TMREBs).To obtain thermodynamically stable single-phase structures for HE TMREB_(2)s,a“16×16 mixed enthalpy matrix”is constructed using first-principles calculations to predict the single-phase formation ability of120 two-component diborides(TCBs).Through the use of the“16×16 mixed enthalpy matrix”of TCBs,specific combinations of TMB_(2)s and REB_(2)s that are most likely to form single-phase HE TMREB_(2)s are ***,based on the energy distribution of the local mixing enthalpies of all possible configurations,the enthalpy and entropy descriptors of HE TMREB_(2)s(RE=Sc,Lu,Tm,Er,Ho and Dy)are *** is found that the mixing enthalpy plays a critical role in the stability of the single-phase HE TMREB_(2)s,i.e.,HE TMREB_(2)s are enthalpy-stabilized *** experimental results further confirm that enthalpy dominates the thermodynamic domain and drives the stability of REB_(2)s in HE TMREB_(2)*** study validates that enthalpy-stabilized HE TMREB_(2)s can further expand the compositional space of ultrahigh temperature ceramics(UHTCs)and is expected to further improve the oxidation resistance and high temperature properties of UHTCs.

关键词： High-entropy ceramics Ultrahigh temperature ceramics First-principles calculation Mixing enthalpy Transition and rare earth metal diborides

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贸易安全与便利视角下加快实施我国AEO制度的路径探析

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上海对外经贸大学学报 2017年第2期24卷 35-44页

作者：匡增杰孙浩上海海关学院上海201204

AEO制度是WCO为维护贸易安全、便利国际贸易而引入的一项管理制度。近年来,我国海关积极进行AEO制度的研究和实践,逐步建立和完善了我国海关的AEO制度。但从实际情况来看,依然存在着口岸协同管理缺乏效率、AEO制度认证技术难度大,认证... 详细信息

AEO制度是WCO为维护贸易安全、便利国际贸易而引入的一项管理制度。近年来,我国海关积极进行AEO制度的研究和实践,逐步建立和完善了我国海关的AEO制度。但从实际情况来看,依然存在着口岸协同管理缺乏效率、AEO制度认证技术难度大,认证成本高、企业认知度低、国际互认难度大等问题。因此,我国海关应进一步强化AEO理念,深化海关与企业之间合作共赢的伙伴关系;夯实基础,不断强化海关自身基础设施建设;加强协作,增强海关与相关部门、行业协会的联系;积极参与国际海关合作,努力推进国际海关AEO互认。

关键词：贸易安全与便利 AEO制度供应链安全

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中国城乡居民收入差距影响因素分析

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统计与信息论坛 2011年第5期26卷 81-85页

作者：孙旷怡中国人民大学统计学院北京100872

目前,过大的城乡收入差距已成为中国经济发展的重要瓶颈,影响了社会的公正与稳定,故将城乡二元结构系数、外贸依存度以及城镇居民人均可支配收入发展速度作为城乡居民收入差距变动的影响变量,通过建立协整回归和误差修正模型得到反映它... 详细信息

目前,过大的城乡收入差距已成为中国经济发展的重要瓶颈,影响了社会的公正与稳定,故将城乡二元结构系数、外贸依存度以及城镇居民人均可支配收入发展速度作为城乡居民收入差距变动的影响变量,通过建立协整回归和误差修正模型得到反映它们之间长期均衡与短期波动的表达式。实证分析结果表明:城镇居民人均可支配收入发展速度是影响中国城乡居民收入差距变动的主要因素。

关键词：城乡居民收入差距协整回归因素分析

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Effect of(-)-Epigallocatechin-3-gallate(EGCG)on the development of atherosclerosis and Toll-like receptor 4-nuclear factor kappa B(TLR4/NF-kB)signaling pathways in Apolipoprotein E(apoE)-deficient mice(apoE-/-)

Effect of(-)-Epigallocatechin-3-gallate(EGCG)on the developm...

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中国病理生理学会受体和信号转导专业委员会暨消化专业委员会联合学术会议

作者： Hongfeng Gu kuang Peng Hui sun Yongzong Yang Department of Physiology,Medical College,Nanhua University,Hengyang,China

(-)-Epigallocatechin-3-gallate (EGCG),a flavonoid found in green tea,is known to inhibit NF-kB activation induced by many pro-inflammatory *** showed that TLR4/NF-kB is involved in ***,EGCG has anti-atherosclerosis(AS) effects on apoE-/- mice,relatively a little is known about precise mechanisms of the inhibitory effects of EGCG on ***,we attempted to identify EGCG prevents the development of atherosclerosis in apoE-/- mice by mechanisams of inhibition of Toll-like receptor 4- nuclear factor kappa B (TLR4/NF-kB) signaling pathways,sixty male apoE-/- mice(Swk old) were divided into four groups;control group,EGCG group,high-fat diet group and high-fat diet+EGCG *** (10 mg/kg) was injected intraperitoneally every day until death (24th W).Areas of aorta atherosclerosis were measured by oil red O staining,western blotting and immunohistochemistry were used to detect the change of expression of TLR4 and NF-kB proteins in mouse aorta,Serum concentrations of IL-1β,TNF-α,sICAM-1 and MCP-1 determined with enzyme-linked immunoabstorbent assay(ELISA).In EGCG group and high-fat diet+EGCG group,EGCG treatment reduced areas of aorta atherosclerosis by 78% and 63% respectively,compared with high-fat diet group (P(-)-Epigallocatechin-3-gallate (EGCG),a flavonoid found in green tea,is known to inhibit NF-kB activation induced by many pro-inflammatory *** showed that TLR4/NF-kB is involved in ***,EGCG has anti-ather

关键词： EGCG atherosclerosis TLR4/NF-kB apoE-/-mouse

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Polymer microbottle with flexible tunability for ultrasensitive ultrasound sensing

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Science China(Physics,Mechanics & Astronomy) 2025年

作者： Liaosha kuang Jialve sun Shengnan Huangfu Tinglan Chen Zijing Cai Tian Xu Xuanyi Zhang Bo Ni Fangxing Zhang School of Physics and Technology Nantong University Peking University Yangtze Delta Institute of Optoelectronics State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking University School of Electronic Information Engineering Shanghai DianJi University

Optical whispering-gallery-mode microcavities have attracted significant attention for their potential in ultrasensitive ultrasound sensing, despite always relying on expensive tunable lasers in applications. In this study, we integrated an electrothermal tuning function inside the microcavity, enabling fast scanning of modes by applying voltages, which helps provide real-time searching and tracking of the optimal mode. Our device demonstrated a quality factor exceeding 10～6with a broad tuning range over 33 GHz. This structure achieved high sensitivity in ultrasound detection, with a noise equivalent pressure（NEP） of 3.35 mPa/Hz1/2at 20 MHz. We further reported the advantages of the mode thermal broadening effect for ultrasound detection, with successfully obtaining high-contrast photoacoustic images. Our research introduces an innovative approach for cost-effective, high-stability ultrasound detection with microcavity, showing great value for application in photoacoustic imaging.

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神华包头煤制烯烃项目卸储煤装置EPC总承包综述

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煤炭工程 2018年第6期50卷 177-180页

作者：孙矿生韩周平中煤科工集团武汉设计研究院有限公司湖北武汉430064

针对目前各EPC总承包商技术和管理水平参差不齐,部分建设单位对EPC总承包合同理解和实施存在偏差,以致造成EPC总承包项目实施未能达到各方预期效果等问题。文章以神华包头煤制烯烃项目卸储煤装置EPC总承包工程项目建设过程和项目管理经... 详细信息

针对目前各EPC总承包商技术和管理水平参差不齐,部分建设单位对EPC总承包合同理解和实施存在偏差,以致造成EPC总承包项目实施未能达到各方预期效果等问题。文章以神华包头煤制烯烃项目卸储煤装置EPC总承包工程项目建设过程和项目管理经验为例,介绍了中煤科工集团武汉设计研究院有限公司承担卸储煤装置的设计、采购、施工安装,直至装置试车和开车支持全过程的工作和服务,并对装置工程的详细工程设计、设备材料采购、施工、业主人员培训、直到完成合同装置启动试运、性能考核和工程竣工验收负责等过程进行了介绍。为煤炭设计院进行EPC项目管理,特别是煤化工配套项目建设管理提供一定的经验参考。

关键词： EPC 项目管理项目策划

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