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nd fe b magnets
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  nd-fe-b磁体
     Employing the disperser,we have mass produced high performance sintered Nd Fe B magnets with N48 using a conventional Nd Fe B sintered process without strictly protecting against oxidation during the following pressing.
     在采用分散剂后 ,后续的模压成型即使在无严格的防止氧化保护下 ,利用传统的烧结 Nd- Fe- B磁体工艺 ,我们批量生产出 N48档的高性能 Nd- Fe- B磁体。
短句来源
     WT10.BZ]In this paper, the theoretical base of the nanocomposite Nd Fe B magnets was investigated The classification, preparation methods and the approaches to improve the magnetic properties ware also summarized Finally, the application prospect of this kind of magnetic materials was introduced
     探讨了纳米复相 Nd- Fe- B磁体的理论依据 ,总结了这种材料的种类、制备工艺以及提高材料磁性能的方法。 最后对这种材料的应用前景进行了展望。
短句来源
     This not only decreases obviously the amount of oxygen in sintered Nd Fe B magnets, but also improves greatly their microstructure and magnetic performance.
     这不但明显地降低了烧结磁体中的氧含量 ,而且极大地改善了烧结Nd- Fe- B磁体的微结构和永磁性能。
短句来源
  nd-fe-b磁体
     Finally,the elevated temperature stabilities of the Nd Fe B magnets were discussed.
     最后讨论了Nd-Fe-B磁体的高温稳定性。
短句来源
  “nd fe b magnets”译为未确定词的双语例句
     The Recent Status of Advanced Processes for Sintered Nd Fe B Magnets with High Performances
     高性能Nd-Fe-B烧结磁体制作工艺近况
短句来源
     The volume fraction of Nd 2Fe 14 B,Nd 90 Fe 4B 4, Nd 1.1 Fe 4B 4 and Nd 2O 3 phases in sintered Nd Fe B magnets is calculated on base of the four phases equilibrium analysis of Nd Fe B ,and the magnetic properties are also evaluated.
     通过对Nd-Fe-B-O 四相平衡的分析,定量计算了在一定工艺条件下Nd-Fe-B烧结磁体中的主相、富Nd 相、富B相和氧化物相的体积分数以及磁体的室温剩磁和磁能积。
短句来源
     Magnetic homogeneity and flux distribution in Nd Fe B magnets have been studied using a statistic method.
     用数理统计方法研究了粉末烧结 Nd- Fe- B永磁体磁性能的均匀性。
短句来源
     The effect of tempering process on the microstructure and magnetic properties of sintered Nd Fe B magnets were studied.
     探讨了回火处理对烧结Nd Fe B系合金显微组织和磁性能的影响。
短句来源
     The study results also show that minor additions of the grain boundary alloys almost do not affect the magnetic properties of sintered Nd Fe B magnets.
     对磁性能的研究结果表明 ,微量添加晶界合金几乎不影响烧结Nd Fe B磁体的磁性能
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  相似匹配句对
     Fe?
     Fe?
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     Fe?
     采用共沉淀法进行了Fe?
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     l and Fe.
     1和Fe.
短句来源
     Electronic Structure of Nd-Fe-B Cluster
     Nd-Fe-B原子团电子结构
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     STUDY ON THE Nd-Fe-B-Si ALLOYS
     Nd-Fe-B-Si合金的研究
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  nd fe b magnets
Country will take up commercial production of Nd-Fe-B magnets, piezoelectric ceramics etc and will enter export market.
      


In order to reduce the Production cost for making Nd-Fe-B magnets, which has record magnetic Properties, a new production technology, reduction-diffusion process, was studied.In which Nd2O3 is used as start ing material to work out Nd-Fe-B permanent magnets directly.The effecte of the contents of Nd, as basic constituent, and Al, Co, as substitute constituents, and some technologic factors on permanent magnetic properties are studied.The practical permanent...

In order to reduce the Production cost for making Nd-Fe-B magnets, which has record magnetic Properties, a new production technology, reduction-diffusion process, was studied.In which Nd2O3 is used as start ing material to work out Nd-Fe-B permanent magnets directly.The effecte of the contents of Nd, as basic constituent, and Al, Co, as substitute constituents, and some technologic factors on permanent magnetic properties are studied.The practical permanent magnets of Nd-Fe-B and Nd-Fe-Co-B are made out.The optimum magnetic properties are Br = 13.7T,MHc = 0. 46MA/m, (BH)max= 286.5KJ/m3 The experimental result shows that oxygen is harmful to magnet properties, so it must be controlled below 0.8%.

为了降低具有卓越永磁性的Nd-Fe-B磁体的制造成本,使之更快得到推广使用,本文研究了采用还原—扩散工艺路线,直接用Nd_2O_3作为原材料制取Nd-Fe-B磁体的方法、研究了基本组元Nd和添加元素CO、Al的含量对永磁性能的影响,成功地制造出Nd-Fe-B系永磁体。其中最佳性能为Br=1.30T,_MH_C=0.46MA/m,(BH)_(max)=286.5KJ/m~3。实验结果还表明,氧在合金中起着有害作用,为了获得优异的磁性能,含氧量必须被控制在0.8%以下。

Curie temperature for Nd-Fe-B magnet was determined by DSC set and thermal demagnetization curve, called σ-T curve, was drawn by magnetic balance. High-temperature metallography was used for directly observing the domain variation with temperature.Both melting process of Nd-rich phase and oxidizing process on specimen surface were observed as well.According to the experiments, the Cuire temperature of Nd2Fe14B phase is 307.51℃ (580.5K) and the melting point of...

Curie temperature for Nd-Fe-B magnet was determined by DSC set and thermal demagnetization curve, called σ-T curve, was drawn by magnetic balance. High-temperature metallography was used for directly observing the domain variation with temperature.Both melting process of Nd-rich phase and oxidizing process on specimen surface were observed as well.According to the experiments, the Cuire temperature of Nd2Fe14B phase is 307.51℃ (580.5K) and the melting point of Nd-rich phase is approximately 6001. The domain structure in Nd2Fe14B phase is just the same as observed in Co single crystal with strong uniaxial anisotropy. If the domain space becomes wide enough, in order to reduce magnetostatic energy of system, then a certain amount of cone-like reversed domains would appear on the surface rather than transverse closure domains, as in the case of Si-Fe sheet. Magnetic contrast of domain decreases with increasing temperature continuously, but, neither local migration of domain walls nor partial regulation of domains can be found until Curie temperature.During cooling, renucleation of domain in the thermal-demagnetized specimen, which has to fit in with crystal orientation, still shows some randomness; consequently, the domains in same grain before and after thermal demagnetization are almostly identical. The Variation of hardness for the magnet within temperature range of 20-750℃ was studied.

用DSC仪测定了Nd-Fe-B磁体的居里温度,以磁秤法绘制了热退磁曲线(σ-T)。并用高温金相显微镜直接观察了Nd-Fe-B磁体畴结构随温度的变化,对畴结构的特点作了初步讨论。同时观察了富钕相的熔融和试样表面的氧化过程。测定了在20℃到750℃磁体维氏硬度的变化。

The normal composition Nd15Fe77B8 is usually used for producing sintered Nd-Fe-B magnets. The magnets are generally composed of Nd2-Fe14B main phase plus Nd-rich and B-rich minor phases. This paper has emphatically investigated the condition necessary for the existence of the B-rich phase, the structure of the B-rich phase and its influence on magnetic properties. The B-rich phase is a stable NdFe4B4 compound...

The normal composition Nd15Fe77B8 is usually used for producing sintered Nd-Fe-B magnets. The magnets are generally composed of Nd2-Fe14B main phase plus Nd-rich and B-rich minor phases. This paper has emphatically investigated the condition necessary for the existence of the B-rich phase, the structure of the B-rich phase and its influence on magnetic properties. The B-rich phase is a stable NdFe4B4 compound and belongs to the tetragonal system with a=7.10A and c=26.47A, having a weak magnetic property. A large number of investigations has shown that the magnetic properties of Nd-Te-B magnets depend directly on its microstructure. Though the influence of the B-rich phase on the coercivity of the magnets is not as essential as the Nd-rich phase, its existence decreaces the saturation magnetization of the magnets. The optimum Theoptimum performance magnets with maximum energy product of 355.8kJ/m3 have been obtained by reducing or eliminating the B-rich phase throughc ontrolling the composition of the alloy.

制造Nd-Fe-B烧结磁体通常采用Nd_(15)Fe_(77)B_8公称合金成分。这种磁体一般由主相Nd_2Fe(14)B和次要富钕相和富硼相组成。本文着重研究了富硼相的存在条件、结构及其对磁性能的影响。富硼相是个NdFe_4B_4稳定的化合物,属于四角晶系,晶格常数α=7.10A,c=26.47A,为弱磁性相。大量研究表明,Nd-Fe-B合金的磁性能直接取决于其相组成。富硼相对磁体矫顽力的影响不象富钕相那样至关重要,但是它的存在会降低磁体的饱和值,我们通过调整合金成分,力图避免或减少富硼相,得到了磁能积为355.8kJ/m~3的最佳性能磁体。

 
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