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Study on surface discharge of nonlinear conductive epoxy resin/SrTiO3 composites in 80–300 K temperature zone

High Voltage 2024年第1期9卷 117-126页

作者： Yunqi Xing Bin Wang Mingyang Wang Jiakai Chi Peng Jia rongjin huang State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjinChina Key Laboratory of Electormagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of TechnologyTianjinChina Key Laboratory of Special Machine and High Voltage Apparatus(Ministry of Education) Shenyang University of TechnologyShenyangChina State Grid Tianjin High Voltage Company TianjinChina China Energy Engineering Group Tianjin Electric Power Design Institute Co. Ltd.TianjinChina CAS Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryBeijingChina

Bisphenol F epoxy resin(EP)is often used in terminal current lead insulation of superconducting equipment because of its good insulation performance,high mechanical strength,good toughness at cryogenic temperatures,and resistance to cold shock and heat ***,due to the wide temperature range of 80–300 K and the strong electric field,the EP-N_(2)interface is prone to surface flashover,resulting in terminal insulation *** improve the reliability of the current lead insulation,non-linear conductive EP/strontium titanate(SrTiO_(3))composites were prepared by modification with nano *** changes of dielectric,surface discharge,flashover,and trap distribution characteristics of composite materials were studied,and the mechanism of SrTiO_(3)on the surface flashover of composite materials was *** results show that the conductivity of the composite increases with the rise of SrTiO_(3)filling content,and the amplitude of improvement is greater under the strong electric field,showing a more significant *** composite has a lower trap energy level and a greater number of shallow traps compared to pure EP,which accelerates surface charge detrapping and reduces charge accumulation,effectively enhancing the discharge and surface flashover voltage of the composite.

关键词： composites composite insulation

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Successive inverse and normal magnetocaloric effects in the Mn-vacancy compound Mn0.95Co0.75Cu0.25Ge

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Science China(Physics,Mechanics & Astronomy) 2020年第7期63卷 109-113页

作者： FengXia Liu Hu Zhang He Zhou DaoYong Cong rongjin huang LiChen Wang Yi Long School of Materials Science and Engineering University of Sc ience and Technology of BeijingBejing 100083.China State Key Laboratory for Advanced Metals and Materials University of Science and Technology of BeijingBejing 100083China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Ferromagnetic-structural transformation has been studied widely in MnCoGe-based materials. However, the magnetostructural transition(MST) from antiferromagnetic(AFM) orthorhombic phase to ferromagnetic(FM) hexagonal phase, which may lead to a large inverse magnetocaloric effect(MCE), has rarely been reported. Here, the introduction of Mn vacancy lowers the structural transition temperature while retains the AFM state in the orthorhombic phase, thus successfully realizing the AFM-FM MST in Mn0.95Co0.75Cu0.25Ge. Moreover, successive inverse and normal MCEs are observed around the first-order AFM-FM MST and the second-order FM-paramagnetic(PM) transition, respectively. A thermostat is proposed based on this special feature, which could release heat above the critical temperature while absorb heat below the critical temperature by simply applying the same magnetization/demagnetization cycles. This thermostat can be very useful in many applications where a constant temperature is required, such as cryostats and incubators.

关键词： magnetocaloric magnetically ordered materials phase transitions

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Broad negative thermal expansion operation-temperature window in antiperovskite manganese nitride with small crystallites

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Nano Research 2015年第7期8卷 2302-2307页

作者： Jie Tan rongjin huang Wei Wang Wen Li YuqiangZhao Shaopeng Li Yemao Han Chuanjun huang Laifeng Li State Key Laboratory of Technologies in Space Cryogenic Propellants Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

Using spark plasma sintering （SPS）, Mn3Cu0.6Ge0.4N crystallites have been fabricated with different crystallite sizes, and their magnetic properties and thermal behaviors were systemically investigated. With decreasing crystallite size, the magnetic transition becomes increasingly slow, accompanied by broadening of the negative thermal expansion （NTE） operation-temperature window. The NTE operation-temperature window for the 12-nm crystallite sample reaches at 140 K, which is about 75% larger than that of the 74-nm crystallite sample. The magnetic properties and NTE operation-temperature window can be tuned by varying the crystallite size. This discovery will promote an even wider range of practical applications in precision devices.

关键词： crystallite size, negative thermal expansion,magnetic transition,antiperovskite manganese nitride

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Dielectric AlN/epoxy and SiC/epoxy composites with enhanced thermal and dynamic mechanical properties at low temperatures

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Progress in Natural Science:Materials International 2022年第3期32卷 304-313页

作者： Zhengrong Zhou rongjin huang Huiming Liu Yalin Zhao Zhicong Miao Zhixiong Wu Wanyin Zhao Chuanjun huang Laifeng Li State Key Laboratory of Technologies in Space Cryogenic Propellants Technical Institute of Physics and Chemistry Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences

In a superconducting magnet, the thermal properties of the insulating material at low temperatures is an important technical index to ensure the normal operation of a superconducting coil. Herein, a low-temperature thermal conductivity testing device with a tiny uncertainty was developed to measure the composites. Furthermore, Si C/epoxy and Al N/epoxy composites were prepared and their properties were tested at low *** results showed that the composites have a better thermal conductivity at low temperatures than pure *** addition, the Al N/epoxy and Si C/epoxy composites have excellent dynamic mechanical properties and low coefficient of thermal expansion. Due to the fair thermal and dynamic mechanical properties, the composites will have potential application in the superconducting magnet.

关键词： Thermal properties Epoxy composites Low temperatures

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Adjustable thermal expansion in La(Fe,Si)13-based conductive composites by high-pressure synthesis

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Progress in Natural Science:Materials International 2019年第1期29卷 28-31页

作者： Wei Wang rongjin huang Yi Shan Yuqiang Zhao Xinran Shan Shibin Guo Chuanjun huang Laifeng Li School of Materials Science and Engineering Tianjin University State Key Laboratory of Technologies in Space Cryogenic Propellants Technical Institute of Physics and Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences

Providing a suitable contact interface, where a high conductivity material with a desirable coefficient of thermal expansion(CTE) adjoins the target micro-electric devices, is very crucial to optimize the properties and service life of the relevant instruments. Regrettably, a high conductivity, low thermal expansion and relatively inexpensive material is very rare. Composites, fortunately, can offer a method to design materials with adjustable properties by mixing two or more diverse constituents. In this paper, high conductivity composites with adjustable thermal expansion were successfully prepared by a high-pressure synthesis. The composites are based on combining La(Fe,Si)-based compounds, the materials showing a giant, isotropic negative thermal expansion(NTE) properties, within Cu matrix. The La(Fe,Si)-based compounds were used to adjust the CTE of the composites, while the Cu phase is in charge of tuning the thermal conductivity properties. Thus, by changing the relative amount of the two components, the composites with high conductivities and adjustable CTE were achieved. Furthermore, the thermal expansion and magnetic properties of the composites were investigated by a physical property measurement system. The present results highlight the potential applications of the Cu-based high conductivity composites with room-temperature NTE properties in the thermal contacts to various semiconductor and microelectronic devices.

关键词： La(Fe, Si)13-based compounds Metal-matrix composites Negative thermal expansion

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Design and development of a lightweight cryogenic system for high temperature superconducting(HTS)filters subsystem

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Science China(Technological Sciences) 2022年第3期65卷 735-739页

作者： DUAN YanBo WANG Jue WANG Wei WU ShanShan QI HaoYing WANG ZeKun FANG ChuShu huang rongjin LI LaiFeng ZHOU Yuan CAS Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China CASIC Space Engineering Development Co.Ltd. Beijing 100854China

Since the discovery of high temperature superconducting(HTS)materials in the 1980 s,HTS filters and motors have developed rapidly[1,2].The extremely low insertion loss and frequency selectivity of the HTS filter make it possible to greatly improve the signal receiving sensitivity and suppress interference ***,it has great potential in aerospace application,satellite communications,mobile base stations,deep space exploration,radar,and other fields[3,4].

关键词： filters high insertion

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The critical role of spin rotation in the giant magnetostriction of La(Fe,Al)_(13)

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Science China Materials 2021年第5期64卷 1238-1245页

作者： Yuzhu Song rongjin huang Ji Zhang Shantao Zhang Qingzhen huang Shouguo Wang Yong Jiang Laifeng Li Xianran Xing Jun Chen Beijing Advanced Innovation Center for Materials Genome Engineering School of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing 100083China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering College of Engineering and Applied Science&Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China NIST Center for Neutron Research National Institute of Standards and TechnologyGaithersburg MD20899-6102USA School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

As an efficient converter between electromagnetic and mechanical energies, magnetostriction is an intriguing property for not only fundamental studies but also technological applications. However, the understanding of its microscopic origin remains challenging, which is critical for the development of magnetostriction materials. Here, the critical role of spin rotation in the giant magnetostriction of La(Fe,Al)_(13) is first revealed by the in-situ magnetic and temperature field of neutron powder diffraction. The giant magnetostriction originates from magnetic-field-driven spin moment rotation of canting structure, in which the sharp increase of ferromagnetic component causes the elongation of icosahedron inside of lattice. Furthermore, it is the first time to reveal the accurate canting antiferromagnetic structure in La(Fe,Al)_(13). The present study provides a new strategy, i.e., the spin rotation, for exploring new magnetostriction functional materials.

关键词： magnetostriction magnetic-field-induced spin rotation magnetic structure neutron powder diffraction

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Thermoelectric Performance of Glass Microsphere Dispersed Bi-Sb Composites at Low Temperature

Thermoelectric Performance of Glass Microsphere Dispersed Bi...

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中国材料大会2012

作者： Zhen Chen Yemao Han Min Zhou rongjin huang Yuan Zhou Laifeng Li Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of Sciences University of Chinese Academy of Sciences

ISBN: (纸本)9783037856062;3037856068

In the present study, the glass microsphere dispersed Bi-Sb thermoelectric materials have been fabricated through mechanical alloying followed by pressureless sintering. The phase composition and the microstructure were investigated by X-ray diffraction （XRD） and scanning electron microscopy （SEM） analysis. Electrical conductivity, Seebeck coefficient and thermal conductivity were measured in the temperature range of 77～300 K. The ZT values were calculated according to the measurement results. The results showed that the electrical conductivity, Seebeck coefficient and thermal conductivity decreased by adding glass microsphere into Bi-Sb thermoelectric materials. However, the optimum ZT value of 0.24 was obtained at 260 K, which was increased 10% than that of the Bi-Sb matrix. So it is confirmed that the thermoelectric performance of Bi-Sb-based materials can be improved by adding moderate glass microspheres.

关键词： Thermoelectric materials Glass microsphere Thermoelectric performance Cryogenic temperatures

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LaFe_(11.2)Si_(1.8)合金的组织结构与负热膨胀性能

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稀有金属材料与工程 2015年第1期44卷 228-231页

作者：刘艳颖李雯黄荣进肖福仁李来风燕山大学河北秦皇岛066004 中国科学院理化技术研究所航天低温推进剂技术国家重点实验室北京100190

通过X射线衍射仪和扫描电子显微镜研究了不同退火工艺的LaFe11.2Si1.8合金的微观组织,并采用热膨胀系数测试仪测试了其膨胀性能。结果表明:经过1200℃退火5 h的试样获得了含一定量α-Fe杂相的组织;经1050℃退火15 d和1100℃退火2 d均获... 详细信息

通过X射线衍射仪和扫描电子显微镜研究了不同退火工艺的LaFe11.2Si1.8合金的微观组织,并采用热膨胀系数测试仪测试了其膨胀性能。结果表明:经过1200℃退火5 h的试样获得了含一定量α-Fe杂相的组织;经1050℃退火15 d和1100℃退火2 d均获得了NaZn13型La(Fe,Si)13纯相的晶体结构。LaFe11.2Si1.8合金的负膨胀量与La(Fe,Si)13相的含量成正比,纯相试样的负膨胀量达到最大,其ΔL/L值为3.22×10-3,负热膨胀系数α=–39.31×10-6 K-1。

关键词： LaFe11.2Si1.8合金负热膨胀组织退火

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Magnetic-field modulation of topological electronic state and emergent magneto-transport in a magnetic Weyl semimetal

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The Innovation 2023年第2期4卷 78-82,77页

作者： Jianlei Shen Jiacheng Gao Changjiang Yi Meng Li Shen Zhang Jinying Yang Binbin Wang Min Zhou rongjin huang Hongxiang Wei Haitao Yang Youguo Shi Xiaohong Xu Hong-Jun Gao Baogen Shen Geng Li Zhijun Wang Enke Liu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education&Research Institute of Materials Science Shanxi Normal UniversityTaiyuan 030000China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China Ningbo Institute of Materials Technology&Engineering Chinese Academy of SciencesNingboZhejiang 315201China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhouJiangxi 341000China

The modulation of topological electronic state by an external magnetic field is highly desired for condensed-matter *** to achieve this have been proposed theoretically,but few can be realized ***,combining transverse transport,theoretical calculations,and scanning tunneling microscopy/spectroscopy(STM/S)investigations,we provide an observation that the topological electronic state,accompanied by an emergent magneto-transport phenomenon,was modulated by applying magnetic field through induced non-collinear magnetism in the magnetic Weyl semimetal EuB6.A giant unconventional anomalous Hall effect(UAHE)is found during the magnetization re-orientation from easy axes to hard ones in magnetic field,with a UAHE peak around the low field of 5 kOe.

关键词： topological electronic state

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