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Microstructure and properties of Cu-2.8Ni-0.6Si alloy

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Rare metals 2013年第3期32卷 228-233页

作者： Xiang-Peng Xiao Bai-Qing Xiong Guo-Jie Huang Lei Cheng Li-Jun Peng Qi-Ming Liang State Key Laboratory for Fabrication and Processing of nonferrous metals General Research Institute for Nonferrous Metals China nonferrous metals Processing Technology Albetter Albronze Co. Ltd.

The phase transformation behavior and heat treatment response of Cu-2.8Ni-0.6Si （wt%） alloy sub- jected to different heat treatments were studied by X-ray diffraction, transmission electron microsco.y observation, and measurement of hardness and electrical co.ductivity. The variation of hardness and electrical co.ductivity of the alloy was measured as a function of aging time. On aging at the temperature below TR （500-550 ℃） in Cu-2.8Ni-0.6Si alloy, the transformation undergoes spinodal deco.posi- tion, DO22 ordering, and δ-NiaSi phase. On aging at the temperature above TR （500-550 ℃）, the transformation products were precipitations of 8-Ni2Si. The free energy versus co.position curves were employed to explain the microstructure observations.

关键词： Microstructure Hardness Electricalco.ductivity Spinodal deco.position DO22 ordering

A scalable synthesis of silico. nanoparticles as high-performance anode material for lithium-ion batteries

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Rare metals 2019年第3期38卷 199-205页

作者： Jin Li Juan-Yu Yang Jian-Tao Wang Shi-Gang Lu China Automotive Battery research institute co. Ltd.General Research Institute for Nonferrous Metals

In this work, a scalable and co.t-effective method including mechanical milling, centrifugation and spray drying was developed to fabricate Si *** synthesized Si nanoparticles show an average size of 62 nm and exhibit a narrow particle size distribution. The influence of particle sizes on electrochemical performance of Si-based electrode was investigated, and it is found that as the particle size decreases in the studied range, the Si particles show a lower specific capacity and a higher irreversible capacity loss(ICL). Furthermore, an oxide layer with thickness of ～3 nm was detected on the surface of the as-received Si nanoparticles, and this layer can be effectively removed by hydrofluoric acid(HF) etching,resulting in much improved electrochemical performance over the as-received samples.

关键词： Lithium-ion batteries Anode Silico. nanoparticles Wet grinding mill

Precipitation process and its effects on properties of aging Cu–Ni–Be alloy

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Rare metals 2013年第4期32卷 332-337页

作者： Li-Jun Peng Bai-Qing Xiong Guo-Liang Xie Qiang-Song Wang Song-Bai Hong State Key Laboratory of nonferrous metals & Process General Research Institute for Nonferrous Metals Yingtan Shine Electric Metal Material co. Ltd

The precipitation process of aged Cu-Ni-Be alloy was investigated by X-ray diffraction （XRD）, trans- mission electron microsco.y （TEM）, and high-resolution transmission electron microsco.y （HRTEM）. The tensile strength, yield strength, and electronic co.ductivity of this alloy after aging were also studied. The precipitation sequence of the C17510 alloy aged at 525 ℃ is supersat-urated solid solution→G.P zones→ γ″-γ′→ γ. This transformation can be achieved by the accumulation of Be-atom layers. The G.P zones are co.posed of disk-shaped monolayers of Be atoms, which are formed on （001） matrix planes. The intermediate γ″ precipitate is nucleated in the G.P zones. The γ″ and γ′ precipitates have the same orientation relationship with matrix, e.g., （110）p｜｜（100）M,[001]p｜｜[001]M. The tensile strength of specimen shows a maximum during the aging process and then co.tinuously decreases if the specimen is over aged. The strengthening effect of γ′ phase precipitated in aging at 525 ℃ for 4 h is calculated to be 436 MPa acco.ding to the Orowan strengthening, which is quite co.sistent with the experimental data.

关键词： Precipitation process C17510 alloy Metastable phases Strengthening mechanism

Effects of precipitate aging time on the cerium-zirco.ium co.posite oxides

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Journal of Rare Earths 2014年第11期32卷 1010-1015页

作者：钟强崔梅生岳梅王琦王磊郭荣贵龙志奇黄小卫 Grirem Advanced Materials co. Ltd. General Research Institute for Nonferrous Metals

Cerium-zirco.ium co.posite oxides with high performance were synthesized by a co.precipitation method, using zirco.ium oxychloride and rare earth chloride as raw materials. The effects of precipitate aging time on the properties of cerium-zirco.ium co.posite oxides were investigated. The prepared cerium-zirco.ium co.posite oxides were characterized by X-ray diffraction（XRD）, BET specific surface area, pulsed oxygen chemical adsorption, H2 temperature-programmed-reduction（H2-TPR）, scanning electron microsco.y（SEM）, etc. The results showed that the precipitate aging time caused great effects on the properties of cerium zirco.ium co.posite oxides. With the increase of aging time, the cerium zirco.ium co.posite oxides showed enhanced specific surface area, good thermal stability, and high oxygen storage capacity（OSC）. The best performance sample was obtained while the precipitate aging time up to 48 h, with the specific surface area of 140.7 m2/g, and OSC of 657.24 μmolO2/g for the fresh sample. Even after thermal aged under 1000 oC for 4 h, the aged specific surface area was 41.6 m2/g, moreover with a good OSC of 569.9 μmolO2/g.

关键词： cerium-zirco.ium co.posite oxides co.precipitation precipitate aging time thermal stability rare earths

Multi boron-doping effects in hard carbon toward enhanced sodium ion storage

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Journal of Energy Chemistry 2025年第1期100卷 730-738页

作者： Peng Zheng Wang Zhou Ying Mo Biao Zheng Miaomiao Han Qin Zhong Wenwen Yang Peng Gao Lezhi Yang Jilei Liu co.lege of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Greater Bay Area institute for Innovation Hunan University Changsha research institute of Mining & Metallurgy co. LTD.

Hard carbon （HC） has been co.sidered as promising anode material for sodium-ion batteries （SIBs）.The optimization of hard carbon’s microstructure and solid electrolyte interface （SEI） property are demonstrated effective in enhancing the Na+storage capability,however,a one-step regulation strategy to achieve simultaneous multi-scale structures optimization is highly ***,we have systematically investigated the effects of boron doping on hard carbon’s microstructure and interface chemistry.A variety of structure characterizations show that appropriate amount of boron doping can increase the size of closed pores via rearrangement of carbon layers with improved graphitization degree,which provides more Na+storage ***-situ Fourier transform infrared spectrosco.y/electrochemical impedance spectrosco.y （FTIR/EIS） and X-ray photoelectron spectrosco.y （XPS） analysis demonstrate the presence of more BC3and less B–C–O structures that result in enhanced ion diffusion kinetics and the formation of inorganic rich and robust SEI,which leads to facilitated charge transfer and excellent rate *** a result,the hard carbon anode with optimized boron doping co.tent exhibits enhanced rate and cycling *** general,this work unravels the critical role of boron doping in optimizing the pore structure,interface chemistry and diffusion kinetics of hard carbon,which enables rational design of sodium-ion battery anode with enhanced Na+storage performance.

关键词： X ray photoelectron spectrosco.y

Advances in co.tolerant anode catalysts for proton exchange membrane fuel cells

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Progress in Natural Science:Materials International 2024年第4期34卷 654-675页

作者： Ling Liu Rong Zeng Lei Hao National Engineering research Center of nonferrous metals Materials and Products for New Energy China GRINM Group Co. Ltd. GRIMAT Engineering institute co. Ltd. General research institute for nonferrous metals

Pt-based catalysts are often used in a proton exchange membrane fuel cell due to their high activities to oxygen reduction and hydrogen oxidation reaction. However, these catalysts are easily poisoned by co. resulting in a significant reduction of fuel cell performance. The use of co.tolerant catalysts can effectively solve this *** co.poisoning mechanism and anti-poisoning strategies were briefly discussed in this article. It mainly focused on the research progress on co.tolerant catalysts in three aspects: Pt alloy catalysts, metal oxide co.posite catalysts, and blocking layer co.ered catalysts. The advantages and limitations of various catalysts in recent years were also discussed. Creating a porous blocking layer co.ered on the surface of the catalyst can effectively enhance the co.tolerance of the catalysts which co.ld be a promising approach for developing anti-poison catalysts other than co.tolerance. Finally, the prospects for future development of co.tolerant fuel cell catalysts were described.

关键词： PEMFCs co.tolerance Catalysts

Optimization of electrocatalytic properties of NiMoco.foam electrode for water electrolysis by post-treatment processing

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Rare metals 2015年第11期34卷 802-807页

作者： Jian-Wei Wang Yue-Fa Wang Jing-Guo Zhang Yan-Lin Yu Ge-Ge Zhou Lei Cheng Lin-Shan Wang Z.Zak Fang State Key Laboratory of nonferrous metals and Processes General Research Institute for Nonferrous Metals GRIPM Advanced Materials co. Ltd General Research Institute for Nonferrous Metals Department of Metallurgical Engineering University of UtahSalt Lake City

Hydrogen is a potential alternative to fossil fuels in co.ing with the increased global energy demand,and water electrolysis is an attractive approach for H2production. Nickel–molybdenum–co.alt（Ni Mo co. foam electrodes used for water electrolysis were prepared by the electrodeposition method, and the influence of heat treatments on the surface structure of Ni Mo co.foam electrodes,mechanical properties, and electrochemical performance of the synthesized electrodes was investigated in order to optimize the post-treatment processes. The residual carbon in the surface of the electrode was removed by decarbonization in the atmospheric co.dition. The carbon co.tent decreases to lower than 200 ×10-6when the temperature exceeds 500 °C. Next, the material is reduced in hydrogen atmosphere from 500 to 1100 °C to remove the surface oxides. As the temperature increases, the surface molybdenum co.tent increases significantly between 500 and 800 °C, the surface grains beco.e co.rser, and the tensile strength and elongation increase as well. The lowest polarization overpotential is obtained at 800 °C. Below 800 °C, the electrode is only partially reduced and some black oxide zones are observed on the electrode surface,which leads to the higher polarization overpotential. Thesamples heat-treated at the temperatures of higher than 800 °C show better strength and toughness as well as brighter appearance. However, the surface particle co.rsening leads to a decrease in the specific surface area and a higher overpotential.

关键词： Water electrolysis Foam electrode Ni Mo co Post-tr

Characterization of Si/SiGe/Si Deposited on SIMOX SOI by Synchrotron Radiation X-Ray Double-crystal Topography

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Journal of Rare Earths 2004年第z2期22卷 5-7页

作者： Ma Tongda Tu Hailing Hu Guangyong Wang Jing GRINM Semico.ductor Materials co. Ltd. General Research Institute for Nonferrous MetalsBeijing 100088China GRINM Semiconductor Materials Co. Ltd.General Research Institute for Nonferrous MetalsBeijing 100088China GRINM Semiconductor Materials Co. Ltd.General Research Institute for Nonferrous MetalsBeijing 100088China GRINM Semiconductor Materials Co. Ltd.General Research Institute for Nonferrous MetalsBeijing 100088China

The synchrotron X-ray double-crystal topography was employed to investigate the structure of Si/SiGe/Si deposited on SIMOX SOI. Rocking curves with three diffraction peaks were acquired before and after 180° rotation of samples. Double-crystal topographs taken at the full width at half maximum (FWHM) of the three peaks differ from each other. Many defects appear in the Si layers that are likely related to the tilt between SOI and epitaxial layers.

关键词： synchrotron radiation double-crystal topography tilt strained relaxation

Effect of thermal shield and gas flow on thermal elastic stresses in 300mm silico. crystal

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Rare metals 2006年第z2期25卷 45-50页

作者： GAO Yu XIAO Qinghua ZHOU Qigang DAI Xiaolin TU Hailing General research institute for nonferrous metals Beijing 100088 China General Research Institute for Nonferrous Metals Beijing 100088 China General Research Institute for Nonferrous Metals Beijing 100088 China General Research Institute for Nonferrous Metals Beijing 100088 China General Research Institute for Nonferrous Metals Beijing 100088 China

The thermal elastic stresses induced in 300 mm Si crystal may be great troubles because it can incur the generation of dislocations and undesirable excessive residual stresses. A special thermal modeling tool, CrysVUn, was used for numerical analysis of thermal elastic stresses and stress distribution of 300 mm Si crystal under the co.sideration of different thermal shields and gas flow co.ditions. The adopted governing partial equations for stress calculation are Cauchy′s first and seco.d laws of motion. It is demonstrated that the presence and shape of thermal shield, the gas pressure and velocity can strongly affect von Mises stress distribution in Si crystal. With steep-wall shield, however, the maximal stress and ratio of high stress area are relatively low. With slope-wall shield or without shield, both maximal stress and ratio of high stress area are increased in evidence. Whether thermal shields are used or not, the increase of gas flow velocity co.ld raise the stress level. In co.trast, the increase of gas pressure cannot result in so significant effect. The influence of thermal shield and gas flow should be attributed to the modification of heat co.duction and heat radiation by them.

关键词： thermal elastic stress simulation 300 mm Si single crystal