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High Jc Epitaxial Superconducting YBa_2Cu_3O_(7-x) Thin Films

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Rare metals 1990年第1期10卷 66-67页

作者： Chen Lanfeng Zhou Li Wang Chaoqun General research institute of non-ferrous metals.Beijing,China Li Lin Zhao Bairu Zhang Yinzi Qiu Xianggang institute of Physics,Academia Sinica,Beijing.China Pang Shijing Beijing Laboratory of Vacuum Physics,China Kou Yuanheng Department of Physics.Peking University,Beijing,China General research Inst of non-ferrous Metals China

Excellent epitaxial growth of supercon-ducting YBaCuOthin films have beenrealized on(100)SrTiOand(100)ZrOsubstrates by a planar rf or DC-magnetronsputtering apparatus with UHV *** of growth and the epitaxial orientationof the film strongly depended on substratetemperature,the substrate orientation and ox-ygen partial *** films exhibitedsuperconducting onset at 92K and zero resist-ance at 90K with critical current density of

关键词： YBCO high Thin Films High Jc Epitaxial Superconducting YBa2Cu3O Cu

Effects of annular electromagnetic stirring processing parameters on semi-solid slurry production

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中国有色金属学会会刊：英文版 2010年第S3期20卷 873-877页

作者：陈兴润张志峰徐骏 National Engineering & Technology research Center for non-ferrous Metal Matrix Composites General Research Institute for Non-fe rrous Metals

A computational model coupling an electromagnetic model with a macroscopic heat and fluid flow model in semi-solid aluminum alloy slurry preparation by annular electromagnetic stirring(A-EMS) was *** of A-EMS processing parameters,such as stirring current,stirring frequency and stirring gap width,on macroscopic transport phenomena during the solidification were analyzed by commercial software ANSYS 10.0 with corresponding experimental *** results show that the magnetic flux density and the melt velocity increase and the temperature difference decreases as stirring gap width and stirring frequency decrease or the stirring current *** slurry with the fine and uniform globular grain structure can be gained by adjusting gap width,electromagnetic frequency and current,such as under the conditions of 10 mm of gap width,10 Hz of electromagnetic frequency and 50 A of *** calculated results are in reasonably good agreement with the measured ones.

关键词： electromagnetic stirring semi-solid slurry numerical simulation microstructure

Microstructure and interface fracture of LPPS Ni/Fe and Cu/Ni sprayed materials

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中国有色金属学会会刊：英文版 2002年第2期12卷 297-300页

作者：李东飞邵贝羚刘安生安生朱其芳 General research institute for non-ferrous metals 北京 100088

The interfaces of two materials, Ni/Fe and Cu/Ni, deposited by low pressure plasma spraying method, were studied by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) combined with energy dispersive X ray spectroscopy (EDS). The adhesion between coatings and substrates was measured with the aid of Knoop interfacial indentation testing method. The results show that the interfacial microstructures have strong influence on the mechanical properties. Cu/Ni interface is weak link with NiO amorphous phase. Ni/Fe interfacial layer consists primarily of Fe and Ni oxide crystalline phases, containing dispersive (Fe, Ni) spotlike intermetallic compound phase in nanometer dimension, and the interfacial interdiffusion was detected. The micro mechanism of interfacial fracture was discussed.

关键词：显微结构非晶相低压等离子喷涂界面粘结强度 Ni/Fe Cu/Ni

High-T_c Superconducting Films with J_c 1.5×10~6 A·cm^(-2) Prepared on Substrate ZrO_2 (100) by DC-magnetron Sputtering

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Rare metals 1990年第2期10卷 150-151页

作者： Yang Bingchuan Wang Xiaoping Cui Changgeng Li Changlin General research institute for non-ferrous metals. Beijing 100088 institute of Physics Academia Sinica,Beijing 100080 General research Inst for Non-ferrous Metals China

Values of critieal eurrent densityJ。exceeding lo6A·em一2 at 77K and zerofield have been rePorted for thinmagnetlcfllnls ofYBaoCu:O,on sinZle ervstal substrates ofSrTIO:〔l一3)and一MgO(4,5)by *** tne rCSUltS OIJ、)IU一A’cm一IorY廿tU Illms on suoslrale 01 slngleerystal ZrO:(100)have not been found out inPublished PaPers 50 *** to themierostrueture eharacters and highJ。ofYBCO films by contrast with bulk it 15 themost Possible to aPPly the fllms to eleetronicfield *** it 15 more signifieant toimProve values ofjcsubstrate with betterPIOCeSSJc>

关键词： High-T_c Superconducting Films with J_c 1.5 Prepared on Substrate ZrO2 by DC-magnetron Sputtering cm DC

Extraction kinetics of zinc by new extractant in ammoniacal system

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Journal of Central South University 2013年第7期20卷 1797-1804页

作者： HUANG Ling HE Jing CHEN Yong-ming YANG Sheng-hai JIN Sheng-ming TANG Mo-tang School of Metallurgical Science and Engineering Central South University Changsha 410083 China guangzhou research institute of non-ferrous metals Guangzhou 510000 China

The controlling step and the extraction reaction rate equation of zinc extraction from Zn（II）-NH3 solution by using a newly synthesized organic compound, 2-acetyl-3-oxo-dithiobutyric acid-myristyl ester as the zinc extractant, were clarified. The effects of agitation speed, specific interfacial area, temperature, extractant concentration and Zn ion concentration on the extraction rate are studied in constant interfacial area cell. The results show that the extraction rate depends on interfacial chemical reaction and diffusion by using this new extraetant to extract zinc, and the apparent activation energy of this extraction reaction is measured as 28.2 kJ/mol, which demonstrates that the extraction reaction is controlled by the mixed-controlled reaction rate. The apparent reaction orders a and b are measured as 1 and 0.38, and the constant k0 is 138.70. So, when extraction conditions are controlled as [HR]=20%-50%, T=0-30℃, N=120-177 r/min and S=72.6-127.5 m-1, the solvent extraction reaction rate can be depicted as v/（mol . m-2 . s-1 ） = 138.7. exp（ - 28 206/8.314T ）. [Zn 2＋ ]r ·[HR ]o0.38.

关键词： solvent extraction zinc 2-acetyl-3-oxo-dithiobutyric acid-myristyl ester kinetics

Deformation behavior and dynamic recrystallization of Mg-Y-Nd-Gd-Zr alloy

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Journal of Rare Earths 2008年第6期26卷 846-850页

作者：赵欣张奎李兴刚李永军何庆彪孙建锋 State Key Laboratory for Fabrication and Processing of non-ferrous metals General Research Institute for Non-Ferrous Metals The 518th institute No.5 Academy of China Aerospace Science and Technology Corporarion

The characteristics of dynamic recrystallization （DRX） in Mg-Y-Nd-Gd-Zr-RE magnesium alloy were investigated by compression tests at temperatures between 523 and 723 K and at strain rates ranging from 0.002 to 1 s^-1 with maximum strain of 0.693. The strainhardening rate can be obtained from true stress-true strain curves, plots of θ-σ, -（δθ/δσ-）-a and lnθ-σ in different compression conditions were obtained by further study. The critical condition of the onset of DRX process was determined as （（δ/δσ（ δθ/δσ））=0. In the range of the above deformation temperature and strain rate, the ratio of critical stress （σc） to peak stress （σm） and critical strain （εc） to the peak strain （εm） stood at σc/σm=0.62-0.89 and εc/εm=0.11-0.37, respectively. DRX could be observed during hot detormation process, microstructure evolution of the magnesium alloy at different temperatures and strain rates were studied with the aid of optical microscope（OM）, and the average recrystallized grain size was measured by means of intercepts on photomicrographs. It was shown that the average dynamically recrystallized grain size （drew） changed with different deformation parameters, the natural logarithm of the average recrystallized grain size varied linearly with the natural logarithm of Zener-Hollomon parameter; the peak stress changed with the average recrystallized grain size, and the natural logarithm of the average recrystallized grain size varied linearly with the natural logarithm of the peak stress.

关键词： hot-compression dynamic recrystallization (DRX) strain-hardening rate average recrystallized grain size rare earths

Tin oxide-graphite composite for lithium storage material in lithium-ion batteries

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Rare metals 2003年第3期22卷 226-229页

作者： ZHANG Xiangjun, HUANG Songtao, WU Guoliang, LU Shigang, and CAI ZhenpingGeneral research institute for non-ferrous metals, Beijing 100088, China General research institute for non-ferrous metals 北京 100088

A SnO-graphite composite material, which can deliver high capacities and good cycling stability compared with unsupported SnO, was described. This material prepared via chemical co-precipitation reaction in the presence of graphite consists of high dispersion of SnO with a size of about several hundred nanometers in the graphite. The phase structure was analyzed by X-ray diffraction (XRD). The morphology and the element distribution were examined by scanning electron microscopy (SEM) equipped with energy spectrum. The results show that the SnO-graphite composites produced by slowly hydrolysis have higher rechargeable capacities than pure graphite and better cycling performance than SnO.

关键词： lithium-ion battery composite co-precipitation tin oxide storage material graphite

Effects of boron on the microstructure and thermal properties of Cu/diamond composites prepared by pressure infiltration

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International Journal of Minerals,Metallurgy and Materials 2011年第4期18卷 472-478页

作者： Ye-ming Fan Hong Guo Jun Xu Ke Chu Xue-xin Zhu Cheng-chang Jia non-ferrous Metal Processing Division General Research Institute for Non-ferrous Metals Beijing 100088 China institute of Powder Metallurgy University of Science and Technology Beijing Beijing 100083 China

Diamond reinforced copper（Cu/diamond） composites were prepared by pressure infiltration for their application in thermal management where both high thermal conductivity and low coefficient of thermal expansion（CTE） are *** were characterized by the microstructure and thermal properties as a function of boron content,which is used for matrix-alloying to increase the interfacial bonding between the diamond and *** obtained composites show high thermal conductivity（660 W/（m·K）） and low CET（7.4×10-6 K-1） due to the formation of the B13C2 layer at the diamond-copper interface,which greatly strengthens the interfacial *** property measurements indicate that in the Cu-B/diamond composites,the thermal conductivity and the CTE show a different variation trend as a function of boron content,which is attributed to the thickness and distribution of the interfacial carbide *** CTE behavior of the present composites can be well described by Kerner＇s model,especially for the composites with 0.5wt% B.

关键词： composite materials pressure infiltration thermal conductivity coefficient of thermal expansion

Effect of closed-couple gas atomization pressure on the performances of Al-20Sn-1Cu powders

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Rare metals 2008年第4期27卷 439-443页

作者： ZHAO Xinming XU Jun ZHU Xuexin ZHANG Shaoming National Engineering and Technological research Center for non-ferrous metals Composites General Research Institute for Nonzferrous Metals Beijing 100088 China

Al-20Sn-1Cu powders were prepared by gas atomization in an argon atmosphere with atomizing pressures of 1.1 and 1.6 MPa. The characteristics of the powders are determined by means of dry sieving, scanning electron microscopy （SEM）, optical microscopy （OM）, and X-ray diffractometry （XRD）. The results show that the powders exhibit a bimodal size distribution and a higher gas pressure results in a broad size distribution. All particles in both cases are spherical or nearly spherical and satellites form on the surface of coarse particles. Dendritic and cellular structures coexist in the particle. With decreasing particle diameter, the secondary dendrite arm spacing （SDAS） decreases and the cooling rate increases. The particles processed under high gas atomization pressure （1.6 MPa） exhibit a lower SDAS value and a higher cooling rate than those of the same size under low gas atomization pressure （1.1 MPa）. The XRD results show that the Sn content increases with decreasing particle size.

关键词： powder production Al-Sn-Cu alloy gas atomization rapid solidification particle size distribution