特种稀土永磁材料的包装

描述了稀土永磁体的特殊性能以及其包装的特殊性，总结了国内稀土永磁体的包装方法，对搞好我国稀土永磁体的出口包装，提高产品的综合品质提出了建议。     

高温稀土永磁体Sm(CoCuFeZr)z的研究现状

总结了影响高温磁体使用温度的关键因素，分析了成分对高温永磁体Sm(CoCuFeZr）z使用温度的影响，概括了高温永磁体Sm(CoCuFeZr)z的矫顽力机理，并探讨了高温永磁体Sm(CoCuFeZr)z今后的研究方向。     

粘结永磁体发展现状

主要分析了当前粘结永磁体产业发展的现状、最新发展动态，并叙述了粘结永磁体常用的生产方法。认为粘结水磁产业当前面临极佳的发展机遇。并对目前国内粘结永磁体现状及方向提出了一些看法和建议。     

磁约束阻尼的减振机理

采用在约束层端部上设置永磁体的新方法可使阻尼层获得比传统约束阻尼处理方法更高的剪应变，从而增强粘弹层的阻尼耗能。本文应用Hamilton原理，考虑永磁体的影响，推导了对称双层夹心悬臂梁的运动方程，对模型进行了实验验证；分析了一阶共振时，永磁体对共振振幅、阻尼层剪应变、约束层作用力的影响，阐明了新型的磁机敏约束阻尼方法的减振机理。     

基于正交设计的二次磁浮力关键影响因素试验

永磁体浸没于磁流体中可自悬浮，而其所受二次磁浮力解析建模非常复杂。基于磁流体中永磁体受力模型的初步分析结论，确定永磁体材料、磁流体为试验关键因素，重点针对永磁体自身特性参数及磁流体特性参数构造不等水平正交设计表。提出一种永磁体悬浮高度超声波测量方法，并应用于实际测量，该方法能够消除容器壁厚、反射面与实际表面差异对测量结果的影响。对正交试验结果进行显著性分析及检验，得到影响二次磁浮力关键因素的显著性关系以及最佳因素水平组合。     

晶化工艺对纳米复合永磁体组织和磁性能的影响

本文就晶化工艺对纳米双相复合永磁体的组织和磁性能的影响的研究进展做一综述,探讨了等温退火条件对纳米双相复合永磁体显微组织和磁性能的影响规律,发现传统的等温退火工艺对纳米复合永磁体的进一步发展具有较大的局限性,提出了几种新的制备纳米双相复合永磁体的晶化工艺.     

2：17型SmCo永磁材料在海水环境中的抗腐蚀性能

本文用电化学实验方法、盐雾实验法分别研究YSm2Co17，永磁体镀层前后在海水环境中的腐蚀行为。结果表明观c0，，永磁体的耐腐蚀性能较差，不利于应用于海水环境，而镀锌能够在一定程度上对材料的耐腐蚀性有所改善。     

摆式调谐质量阻尼器频率调节新方法

针对大型摆式调谐质量阻尼器(PTMD)频率调节较难的问题,提出了一种基于永磁体作用力的频率调节新方法,即在PTMD上附加安装永磁体刚度调节装置,通过调整永磁体产生附加刚度的正负与大小,改变PTMD的等效刚度,继而实现PTMD频率的双向调节。基于拉格朗日方程建立了PTMD与永磁体刚度调节装置耦合系统的运动微分方程,阐述了该频率调节方法的可行性,以及PTMD振动频率随幅值的定性变化规律,最后开展模型试验进一步验证与明确了永磁体作用力对PTMD频率的调节机理。理论分析与试验结果表明:当摆式PTMD质量块两侧均布置相吸永磁体时,PTMD频率降低;当布置相斥永磁体时,PTMD频率增大;PTMD频率调节初步设计时,永磁体作用力的附加刚度理论计算值宜适当折减后作为实际等效刚度,该折减系数可偏保守的取为0.5。     

粘结稀土永磁体发展概况

综述了粘结稀土永磁体的发展概况,分析了当前粘结稀土永磁体产业发展的状况和最新发展动态.并简要叙述了粘结稀土永磁粉、粘结稀土永磁体的制造方法和工艺.我国粘结稀土永磁产业目前面临极佳的发展机遇.     

多层板式电涡流阻尼器构型与磁路优化分析

为提升板式电涡流阻尼器(PECD)的耗能效率,对比分析了单层与多层PECD典型构型的紧凑性与材料利用率,发展与完善了多层PECD构型与磁路优化设计。基于某单排式多层PECD样机阻尼性能测试结果,校验了三维电磁场有限元稳态分析法预测PECD等效阻尼系数的精度;仿真分析获得了永磁体与导体铜板之间的磁场间隙、永磁体的固定材料、间距与布置方式等参数对多层PECD等效阻尼系数的影响规律,据此提出了多层PECD的优化构型与磁路。结果表明:与单层PECD相比,多层PECD耗能效率得到有效提升,结构也更为紧凑;磁场间隙及永磁体的固定材料、布置方式与间距等对PECD等效阻尼系数均有显著影响,其中磁场间隙、相邻永磁体磁极布置与间距等存在最优参数。多层PECD的优化构型与磁路为:磁场间隙宜尽可能减小;采用非导磁材料固定永磁体;同侧永磁体宜阵列布置;永磁体沿阻尼器运动方向磁极宜相反布置,间距取0.2倍永磁体同向尺寸;永磁体沿垂直于阻尼器运动方向磁极宜相同,且间距越小越好。     

Permanent magnet materials

Permanent magnets are finding ever-increasing uses as magnet technology develops and materials improve. Permanent magnet materials are evaluated in terms of the geometry and configuration of the application for which they are intended. The origin of the properties of most modern permanent magnet materials is interpreted in terms of fine-particle theory. The fine-particle structures are produced either synthetically or by a solid-state precipitation reaction in an alloy. The preparation and properties of commercial magnets are described. The Alnico alloys are based on magnetically heat-treated iron-nickel-aluminum-cobalt alloys and account for the great majority of present-day production. Ferrites are finding increasing use. Elongated single-domain fine-particle magnets and other materials are used in smaller quantities. A number of interesting, not yet commercial, materials deriving their properties primarily from crystal anisotropy are described.     

Sm2(CoCuFeZr)17永磁材料的研究现状及展望

介绍了Sm2(CoCuFeZr)17永磁材料的制备工艺和方法,重点分析了Sm2(CoCuFeZr)17永磁体的显微组织、矫顽力机理以及合金成分对磁体性能的影响,展望了Sm2(CoCuFeZr)17永磁材料的研究趋势.     

Development of superconducting and cryogenic technology in the Institute for Technical Physics (ITP) of the Research Center Karlsruhe

Since the early 1970s the Institute for Technical Physics of the Research Center Karlsruhe has been involved in the development of superconductivity for research and industrial applications. A broad program with a focus on the superconducting magnet technology was established to include large magnets for nuclear fusion, high-field magnets for nuclear magnetic resonance spectrometers, ore separation and energy storage magnets. Research and development work was performed in collaborative projects with other national as well as international institutions and industry. The success of these projects has been supported by a broad foundation of engineering science in superconductor development, electrical and cryogenic engineering. Several well known test facilities like TOSKA, STAR, HOMER, MTA along with well equipped laboratories for conductor development, materials at cryogenic temperatures, cryogenic high-voltage engineering have made substantial contributions to in-house, national and international projects. A strong cryogenic infrastructure with two refrigerators and sophisticated cooling circuits from about 4.5 K down to 1.8 K assure the reliable operation of these large facilities. Last but not least, cryogenic research, including vacuum pumps for International Thermonuclear Experimental Reactor, improvements in thermal insulation, cryogenic instrumentation and small on board refrigerators has supported progress in this field. High-temperature superconductivity projects for low AC loss conductors, a 70 kA current lead and a fault current limiter are currently in progress.     

具有正温度系数的2:17型Sm(Co,Fe,Cu,Zr)z永磁体的研究现状

总结了矫顽力具有正温度系数的2:17型Sm(Co,Fe,Cu,Zr)z永磁体的研究现状;分析了成分与胞状显微组织对矫顽力正温度系数的影响,概括了目前解释矫顽力正温度系数的几种矫顽力机制模型,提出了对矫顽力正温度系数的研究是高温永磁体Sm(Co,Fe,Cu,Zr)z今后一个很有前景的新研究方向.     

各向异性HDDR工艺Nd(Fe,Co)B粘结磁体的反磁化过程和矫顽力

研究了取向磁场对ＨＤＤＲ工艺制备的各向异性Ｎｄ（Ｆｅ,Ｃｏ）Ｂ粘结磁体顽力的影响。实验指出：阴着施加取向磁场强度的逐渐增强,磁体的制磁和矫顽力不同程度的增加。磁体的反磁化过程包括晶粒内部的成核过程和晶粒之间的畴壁位移过程,矫力应由两种反磁化过程的共同作用决定。     

Magnetic properties and microstructure of radially oriented Sm(Co,Fe,Cu,Zr)z ring magnets

Radially oriented Sm(Co,Fe,Cu,Zr)_z ring magnets are prepared by powder metallurgy with appropriate magnetic field molding, sintering process and aging treatment. The results indicate that radially oriented Sm(Co,Fe,Cu,Zr)_z ring magnets have obvious anisotropy of thermal expansion and sintering shrinkage, which easily lead to the splits and deformation of the ring magnets. So, slow heating, vacuum pre-sintering in sintering process and various quenching processes at different steps during quenching are adopted. The magnets have excellent magnetic properties: B_r = 10.8 kGs, H_cj = 27.6 kOe, BH_max = 28.1 MGOe. Besides, there is a uniform magnetization field on the surface of the ring magnets. The average surface magnetization field () is 1.502 kGs. The deviation from average (α) is only 4.2%. The microstructure of the magnets consists of a mixture of homogeneous cellular and lamella structures.     

变形量对热压/热变形纳米复合Nd_9Fe_（84.5）Co_1B_（5.5）永磁体晶粒尺寸和矫顽力的影响

采用热压/热变形工艺制备纳米复合Nd9Fe84.5Co1B5.5永磁体,研究了热变形过程中的变形量对磁体平均晶粒尺寸的影响以及由此带来的晶间相互作用和矫顽力的变化。结果表明变形量54%的磁体中的硬、软磁性相的平均晶粒尺寸分别为61.0和51.8nm,与其热压状态时的两相平均晶粒尺寸（52.1和54.0nm）接近;而变形量74%的磁体中的硬、软磁性相的平均晶粒尺寸则分别显著减小至19.2和22.4nm。随着两相晶粒尺寸的显著细化,磁体中的晶间相互作用由以静磁耦合作用为主转变为以晶间交换耦合作用为主,这导致其矫顽力提高了64%。     

Optimization of Periodic Permanent Magnet Configuration in Lorentz-Force EMATs

The relative merits of three different periodic permanent magnet (PPM) configurations are investigated for the generation of SH₀ waves with a Lorentz-force electromagnetic acoustic transducer (EMAT) on a 60-mm diameter aluminum pipe. Such transducers are often used for checking the integrity of pipelines. It was found that minimizing lift-off by using magnets machined to the same curvature as the pipe increased the magnitude of the generated wave by over 70%, compared to the use of a PPM with a single planar surface. A less expensive and more versatile alternative is to use a PPM for which the two lines of magnets are angled with respect to each other to realize closer average proximity to the pipe surface. Numerical simulations and experiments indicated that the amplitude of a SH₀ wave with this magnet configuration would still be approximately 60% higher than the reference case of a PPM with a single planar surface.     

Matrix effect in soft metal-bonded samarium-cobalt (SmCo5) permanent magnets

This paper discusses the preparation of samarium-cobalt (SmCo₅) alloy powders by reduction-diffusion process. These powders were blended with equal weight percentages of soft metal/alloy powders, such as indium, tin and solder alloy (Pb-17Sn), to prepare bonded magnets. Important magnetic properties such as remanence, coercivity and energy product of these magnets were measured. Effect of matrix metal/alloy on the magnetic properties of processed magnets is outlined.