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Influence of zirconium addition on the microstructure and magnetic properties of nanocomposite Nd_(10.1)Fe_(78.2-x)Co_5Zr_xB_(6.7) permanent magnets

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Rare Metals 2007年第3期26卷 218-221页

作者： FENG Shanshan ni jiansen WANG Zhanyong WU Yisheng ZHOU Bangxin XU Hui Institute of Materials Science Shanghai University Shanghai 20007 China

Nanocomposite Nd10.1Fe78.2-xCo5ZrxB6.7 （x= 0, 1.5, 2.5, 2.7, 3, 4） permanent magnets were prepared by melt-spun and annealing. The microstructure and magnetic properties of the permanent magnets were investigated. The resuits reveal that the addition of Zr element significantly reduces the grain size and improves the thermal stability of the amorphous phase. A fme nanocomposite microstructure with an average grain size of about 35 nm can be developed at a wheel speed of 16 m·s^-1 with the content of Zr up to 2.7 at.%. After optimal annealing （710℃ x 4 min）, the magnetic properties of the ***6.7 bonded magnets were achieved as follows： Br= 0.72 T, jHc = 769 kA·m^-1, and （BH）max = 85.0 kJ·m^-3.

关键词： magnetic properties Nd-Fe-B nanocomposite rare earths bonded magnet

Investigation on nanocomposite magnets by three-dimensional atom probe

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Chinese Science Bulletin 2006年第13期51卷 1655-1656页

作者： WANG Zhanyong ZHOU Bangxin ni jiansen XU Hui Institute of Materials Shanghai University Shanghai 200072 China

With the fast development in nano ma- terials, to obtain the detailed microstructure informa- tion, microscopes with much higher resolution than the conventional ones are required. A three-dimen- sional atom probe (3DAP), an instrument with near- atomic resolutions of about 0.06 and 0.2 nm in depth and transverse direction, respectively, has been em- ployed to map out the elemental distribution of some conductive materials within a nano-scale volume. This instrument is fit to analyze the elemental distri- bution in nano materials and nano precipitation in common materials. 3DAP is applied to investigate the microstructure of Nd2Fe14B/α?Fe nanocomposite magnets. B, Fe-enriched, Zr-enriched and Nd, Fe-enriched clusters have been found, which cannot be identified by any other instrument.

关键词： 3DAP Nd2Fe14B/α-Fe 纳米复合材料磁体

Effect of Mineral Oil on the Mechanical Properties and Fractographs of Fe_3(Al,Cr,Zr) Intermetallic Alloy

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Journal of Materials Science & Technology 1998年第6期14卷 564-566页

作者： jiansen ni Xiaojing WAN Wenjue CHEN and Song WANG(Institute of Metallurgy and Materials Science, Shanghai University Shanghai 200072) Institute of Metallurgy and Materials Science Shanghai University Shanghai 200072 China

The effect of mineral oil on the mechanical properties and fractographs of Fe3(Al,Cr,Zr) in termetallic alloy has been investigated. The results show that the tensile ductility of the Fe3(Al,Cr,Zr) alloy tested in oil is comparable with the results obtained in oxygen and is in sensitive to strain rate. The fracture mode of the Fe3(Al,Cr,Zr) alloy treated at 700℃/1.5 h and tested in oil, is cleavage and with dimples in some areas.

关键词： Al,Cr,Zr Effect of Mineral Oil on the Mechanical Properties and Fractographs of Fe3 Intermetallic Alloy Zr Fe Cr

Microstructural characteristics of Nd_2Fe_(14)B/α-Fe nanocomposite ribbons bearing Nb element

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Rare Metals 2008年第3期27卷 299-302页

作者： WANG Zhanyong LIU Wenqing ZHOU Bangxin ni jiansen XU Hui LI Qiang Department of Materials Engineering Shanghai Institute of Technology Shanghai 200235 China Institute of Materials Shanghai University Shanghai 200072 China

The effects of Nb on the microstructure and magnetic properties of （Nd0.9Dy0.1）9.5Fe79_xCo5NbxB6.5 （x = 0, 1） nanocomposite magnets were investigated. A fine and uniform microstructure was achieved for the ribbons annealed at 710℃ for 4 min, enhancing the interaction coupling between grains and improving the magnetic properties. The results of three-dimensional atom probe （3DAP） indicated that Fe-Nb-B inter- granular phase existed at the grain boundaries, suppressing the grain growth during the crystallization process. The coercivity was improved from 224 to 643 kA/m for the modification of the microstructure.

关键词： Nd2Fe14B/α-Fe nanocomposite magnet 3DAP magnetic properties

Study on Two-phase Nanocrystalline Nd_(8.5)Fe_(74)Co_5Cu_1Nb_1Zr_3Cr_1B_(6.5)Permanent Magnet

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Journal of Materials Science & Technology 2004年第2期20卷 142-144页

作者： jiansen ni, Hui XU, Mingyuan ZHU, Qiang LI, Bangxin ZHOU and Yuanda DONGInstitute of Materials, Shanghai University, Shanghai 200072, China Institute of Materials Shanghai University Shanghai 200072 China

Nd8.5Fe74Co5Cu1Nb1Zr3Cr1B6.5 bonded magnets were prepared by melt-spun and subsequent heat treatment. Magnetic properties of Br=0.68 T,JHc=716 kA/m, (BH)max=77 kJ/m3 were achieved. The addition of Cr element shows to ... 详细信息

关键词： Nd-Fe-B Nanocrystalline Melt-spinning Magnetic properties

A New Simple Route to ZnS Quantized Particles with Tunable Size and Shape, and Size/Shape-Dependent Optical Properties

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Advances in Materials Physics and Chemistry 2013年第1期3卷 10-18页

作者： Pengfei Hu Yali Cao Yanyan Lou Bo Lu Min Shao jiansen ni Meng Cao Institute of Applied Chemistry Xinjiang University Urumqi China. Laboratory for Microstructures Shanghai University Shanghai China Laboratory for Microstructures Shanghai University Shanghai China. School of Materials Science and Engineering Shanghai University Shanghai China.

With the features of convenience and eco-friendly, the low-temperature solid-state reaction synthesis was successfully developed as a new approach to prepare quantum-sized ZnS nanocrystals. One major achievement is that the size and shape of ZnS nanocrystals can be tuned by adjusting the surfactant and its feed. The UV-Vis absorption spectra of quasispherical and one-dimensional quantum-sized ZnS nanocrystals all showed a blue-shift from the bulk counterpart, indicating large quantum confinement effects of ZnS nanocrystals. These ZnS nanocrystals all showed well-defined excitonic emission features. Contrastive studies on photoluminescence performances indicated that the bandedge emission experienced only the size-dependent quantum confinement effect, while the trap-state emission experienced the size- and shape-dependences. So we can design a purposeful synthesis route to ZnS nanocrystals with target luminescence emission performances.

关键词： Solid-State Nanosynthesis Tunable Size- and Shape-Dependence Optical Properties

Effect of high magnetic field on the crystallization of Nd_2Fe_(14)B/α-Fe nanocomposite magnets

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北京科技大学学报 2006年第8期28卷 777-777页

Nd_ 8.1 Dy_ 0.9 Fe_ 76.95 Co_ 8.55 B_ 5.5 nanocomposite magnets annealed with and without a 10 T magnetic field were investigated in this article. The ribbons with coexisting amorphous and crystalline phases were selected to do this study. The results of Mssbauer spectroscopy revealed that the content of α-Fe increased when annealed in high strength magnetic field. The size of the grains also increased considerably after the application of magnetic annealing. All these led to the decrease of the magnetic properties,especially the coercivity of the ribbons.

关键词：纳米复合磁体磁性材料结晶化熔融纺丝磁场

添加Cr对纳米复合Nd_2Fe_(14)B/α-Fe合金晶化行为和磁性能的影响

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稀有金属材料与工程 2005年第7期34卷 1051-1054页

作者：王伟倪建森周细应徐晖周邦新上海工程技术大学材料工程学院上海200336 上海大学材料研究所上海200072

采用熔体快淬及晶化处理工艺制备Nd11Fe72-xCo8V1.5CrxB7.5(x=0,1)纳米晶合金。研究了添加Cr对合金晶化行为和磁性能的影响。结果表明,添加Cr提高了软磁相α-Fe和硬磁相Nd2Fe14B的形成温度,降低了硬磁相Nd2Fe14B的居里温度。同时,添加C... 详细信息

采用熔体快淬及晶化处理工艺制备Nd11Fe72-xCo8V1.5CrxB7.5(x=0,1)纳米晶合金。研究了添加Cr对合金晶化行为和磁性能的影响。结果表明,添加Cr提高了软磁相α-Fe和硬磁相Nd2Fe14B的形成温度,降低了硬磁相Nd2Fe14B的居里温度。同时,添加Cr可细化两相晶粒,提高内禀矫顽力,从而提高最大磁能积。

关键词：纳米复合快淬亚稳相磁性能

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温压钕铁硼粘结磁体制备技术的研究

稀有金属材料与工程 2008年第2期37卷 308-311页

作者：陈刚杨小玲徐晖倪健森周邦新上海大学材料研究所上海科技干部管理学院上海201800

采用温压工艺制备了钕铁硼粘结磁体,研究了温压压力、温压温度、粘结剂种类及含量对磁体磁性能的影响,以及温压工艺对钕铁硼粘结磁体氧含量的影响。利用Nd2Fe14B/α-Fe系双相纳米晶磁粉为原料,在200℃下,采用12MPa的压力,获得性能最佳... 详细信息

采用温压工艺制备了钕铁硼粘结磁体,研究了温压压力、温压温度、粘结剂种类及含量对磁体磁性能的影响,以及温压工艺对钕铁硼粘结磁体氧含量的影响。利用Nd2Fe14B/α-Fe系双相纳米晶磁粉为原料,在200℃下,采用12MPa的压力,获得性能最佳的磁体,其密度为6.43g/cm3,磁性能为:Br=0.808T,Hcb=461kA/m,Hci=623kA/m,(BH)max=101kJ/m3。

关键词：温压钕铁硼粘结磁体