我国钕铁硼永磁材料产业技术现状与发展趋势

简述了我国钕铁硼永磁材料产业技术现状,针对存在的高磁能积、高矫顽力、产品一致性好烧结钕铁硼磁体生产工艺不稳定以及各向异性粘结钕铁硼磁体产业化技术不成熟等问题,提出了可通过改善烧结钕铁硼制备工艺、开发耐高温高矫顽力烧结钕铁硼以及加大各向异性粘结钕铁硼产业化技术研究来提升我国钕铁硼永磁材料产业技术水平。     

粘结磁体的市场展望

当今的粘结永磁工业一开始,机遇就空前看好,也成长得相当快。粘结永磁体的新型应用大多发生在器材、电子消费品、医药、娱乐、化学以及传统汽车、音响和工业设备等领域。这些领域对永磁材料的需求一直居高不下,从而推动全球以30亿美元的年销售额快速递增。其中市场增长特别强劲的是粘结NdFeB磁体,其销售额1995年为1.9亿美元,年增长率为25～30%;而规模最大的粘结磁体当数粘结铁氧体永磁,1995年的销售收入已达5亿美元,持续年增长速度保持在6～8%。     

NdFeB系纳米晶双相稀土永磁材料研究进展

综述了近几年各国学者在NdFeB系纳米晶双相稀土永磁材料方面的研究进展,重点分析了掺杂元素和处理工艺对永磁材料各方面性能的影响,指出了几种可以有效改善永磁材料综合性能的方法.     

磁性材料、超导材料和器件

TM27 00040107HDDR各向异性粘结NdFeB研究/刘旭波,肖耀福,张正义,王润(北京科技大学)汗功能材料与器件学报.一1909,5(4).一241一248文中在回顾粘结NdFeB发展历程的基础上,综述了HDDR各向异性粘结NdFeB研究现状,以及HDDR工艺在其它稀土永磁制备中的应用.图4表1参32(许)TM271 00040108双核Gd(xn)配合物【GdZ(C,ZHsNZ)2-(C6HSCOO)6〕的晶体结构和磁性/牛淑云,金晶,金祥林,丛尧,杨忠志(辽宁师范大学)11科学通报.一一999,44(24)一2635一2640以Gd(NO3)3 6HZO,C6H。COONa,C12HSN:为原料,在HZO,CZHSOH及HAC介质中合成了…     

粘结材料对TCBGA组件剪切特性的影响

采用印制电路板级集成电路进行剪切试验,对比了十组使用不同粘结材料及不同点胶方式的薄型球栅阵列封装(TCBGA)组件和一组未使用粘结材料的组件的剪切特性.结果表明,这些粘结材料均不同程度地提高了组件的剪切强度,其中底部部分和完全填充点胶方式效果较佳,相对于无粘结材料,组件所能承受的最大剪切力分别提升了87.51%和53....     

钕铁硼永磁材料的性能及研究进展

钕铁硼磁体被称为第3代稀土永磁材料,烧结钕铁硼磁体是目前综合磁性能最高的永磁材料。概述了钕铁硼永磁材料的研究进展和应用领域,介绍了钕铁硼磁体的性能及先进制备工艺,指出了目前国内钕铁硼磁体存在的主要问题及今后的研究方向。     

稀土系永磁体的开发和应用

Sm-Fe-N各向同性粘结磁体的开发随着电脑、手机等数字设备的发展，需要更小、更薄、更轻的高性能永磁体。压制注射成型的粘结磁体可以制成小型、复杂形状的零件，特别适用于信息产业用的小型电机，目前各向同性粘结Nd-Fe-B占了稀土类永磁市场的大部分。上世纪90年代的十年中其（BH）max从64kj/m^3提高到99kj/m^3，即提高了近50％。     

新型树脂粘结交换耦合稀土磁体的磁性能

研究了树脂粘结成型，具有交换跃迁现象的磁体的磁性能。这种磁体的起始组成是Ｎｄ４．５Ｆｅ７３ｂ１８．５Ｃｏ３Ｇａ１的Ｎｄ３．５Ｄｙ１Ｆｅ７３Ｂ１８．５Ｃｏ３Ｇａ１，采用熔体快淬，继而短暂热处理的方法制备。其剩余磁化强度接近饱和磁化强度的７０％，在２５０－３２０Ｋ的温度范围内研究了磁性随温度的变化，进行了磁滞测量，把所得数据同一般树脂粘结ＮｄＦｅＢ永磁做了对比，发现交换耦合材料在研究的温度范围内磁性变     

稀土永磁材料在微电机中的应用

简单分析永磁材料与永磁微电机的关系，详细地介绍稀土永磁材料在永磁微电机中的一些应用。     

刚挠结合板用挠性材料和粘结材料性能研究

介绍了刚挠结合板用自主研发改性粘结片AT-25与不同柔性材料结合性能研究,与粘结片BH-25、粘结片AD-25HH进行比较,结果表明自主研发改性粘结片AT-25与柔性材料用于刚挠结合板具有较好效果。     

Use of permanent magnets and magnetic fluids in experimental oncology

The use of permanent magnets and magnetic fields (magnetic fluids and magnetic suspensions) alone or in complex with the antitumour compounds for the treatment of malignancies of various localizations is considered. Methods and forms of the use of permanent magnets are discussed. It is concluded that permanent magnets (as magnetic suspensions and magnetic fluids) used alone, in complex with chemical substances or in combination with other affecting factors (the temperature rise) induce a considerable regression of the tumour. Besides, permanent magnets may promote an increase of the antitumour drug concentration in the tissue of the diseased organ.     

干压磁场成型永磁铁氧体特性及其制造

简要介绍了永磁铁氧体的结构和磁特性，并结合实际生产工艺就干压磁场成型制造永磁铁氧体的过程提出了一些看法。     

Design of a linear bulk superconductor magnet synchronous motor for electromagnetic aircraft launch systems

High-temperature superconducting (HTS) material in bulk form is used to design a linear synchronous motor for an electromagnetic aircraft launch system. The motor is designed without an iron core. Stator coils are placed in the air while the permanent magnets used in conventional design of linear permanent magnet synchronous motors are replaced by the HTS bulk magnets. The physical, operational, and equivalent circuit parameters of the linear motor with HTS bulk magnets are compared with those of a linear permanent magnet synchronous motor and linear induction motor designed for the same application. Results show that utilizing superconducting magnets is only superior at temperatures below 40 K.     

16th International Conference on Magnet Technology (MT-16 1999)

The following topics were discussed: the superconducting magnets for the Large Hadron Collider; superconducting magnets for the Relativistic Heavy Ion Collider; undulators; the RIKEN cyclotron; HERA magnets; high field dipole magnets; detector magnets; the CMS detector; the ATLAS detector; high field solenoid magnets; fusion magnets; magnet electrodynamics; magnetic resonance; energy storage; superconducting power transformers; permanent magnets; magnetic levitation; low temperature superconductors; cable in conduit superconductors; high temperature superconductors; current leads and cryogenics     

永磁式电磁流量传感器及其信号处理

采用永磁体励磁方式制成的电磁流量传感器，既保持了传统线圈励磁电磁流量计的不易堵塞、无压损等优点，又简化了电磁流量传感器的结构，降低了制造成本，并可充分发挥永磁体励磁方式的功耗低、响应速度快等优点。同时，引入了动态反馈控制的方法来消除电极信号中的极化电压，从而使永磁体励磁的电磁流量计应用于一般导电性流体的测量成为可能。     

永磁式电磁流量传感器及其信号处理

采用永磁体励磁方式制成的电磁流量传感器,既保持了传统线圈励磁电磁流量计的不易堵塞、无压损等优点,又简化了电磁流量传感器的结构,降低了制造成本,并可充分发挥永磁体励磁方式的功耗低、响应速度快等优点。同时,引入了动态反馈控制的方法来消除电极信号中的极化电压,从而使永磁体励磁的电磁流量计应用于一般导电性流体的测量成为可能。     

Modern permanent magnets for applications in electro-technology

The range of materials and properties now at the disposal of design engineers is described. Current uses of permanent magnets are reviewed, with particular attention to engineering and economic aspects. The rapid broadening of magnet uses is now occurring as traditional devices are miniaturized, and new applications and design concepts evolve. Currently evolving materials and production processes, prospects for still `better' magnets, and ultimate upper limits for permanent magnet properties are assessed     

Linear Permanent Magnet Oscillatory Machine: Comprehensive Modeling for Transients With Validation by Experiments

A linear and respective nonlinear state space model of a linear permanent magnet oscillatory machine is defined and then its parameters are computed from tests. The experiments were performed on two linear machine prototypes, one with interior permanent magnets and flux concentration and the other with surface permanent magnets. The finite element method model, validated on the existing prototype, shows further improvement possibilities of the interior permanent magnet machine. Dynamic tests and simulations with mechanical coupling of the two machines are used to validate the model in motion and on load. Good agreement between theory and tests in terms of various variables, including the linear position measured with a Laser-based transducer, has been observed.